JPH1010314A - Color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety against carcinogenicity, etc., and spectral characteristics by incorporating specified red, green and blue filter layers in the filter layer. SOLUTION: This color filter includes red, green and blue filter layers. The red filter layer contains an anthraquinone type red pigment and an isoindoline and/or isoindolinone type yellow pigment by 20-60wt.% and the yellow pigment content is 20-50wt.% of the red pigment content. The green filter layer contains a halogenated phthalocyanine type green pigment and an isoindoline and/or isoindolinone type yellow pigment by 20-60wt.% and the yellow pigment content is 5-40wt.% of the green pigment content. The blue filter layer contents a phthalocyanine type blue pigment and a dioxazine type violet pigment by 10-45wt.% and the violet pigment content is 1-40wt.% of the blue pigment content.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a color filter used for a liquid crystal color display.

[0002]

2. Description of the Related Art A liquid crystal color display used as a display device in place of a cathode ray tube or the like realizes color display using a color filter. This color filter is formed by forming a patterned filter layer of three colors of red (R), green (G) and blue (B) on a transparent substrate.

The above color filters are required to have excellent spectral characteristics in order to obtain a liquid crystal color display having a high contrast. The spectral characteristics required for a color filter are that the spectral transmittance is high for a wavelength corresponding to the color of the filter layer and the spectral transmittance is low for wavelengths other than the color. Light sources for liquid crystal color displays generally include 460 nm, 540 nm and 610 nm.
Since a three-wavelength fluorescent lamp having a spectral peak at a wavelength of nm is used, for example, in a red filter layer, the spectral transmittance for the main wavelength of red light, 610 nm, is 10%.
It is preferable that the spectral transmittance for the main wavelength of green light (540 nm) and the main wavelength of blue light (460 nm) is close to 0%.

There are various methods for producing a color filter. Among them, a printing method in which an ink containing a colorant is printed on a transparent substrate to form a filter layer has a simple manufacturing process and is not suitable for mass production. It is excellent and is promising as a method that can realize the cost reduction of the color filter. Among the colorants to be mixed in the color filter ink, those that can realize the above-mentioned spectral characteristics include dyes. However, since the heat resistance of the dye is about 150 ° C., the color may be changed in a heat treatment step at a high temperature in a liquid crystal cell manufacturing process. Therefore, the use of a pigment as a colorant is being studied, but the red, green, and blue pigments, which are the main pigments of the filter layers of each color, must sufficiently satisfy the above-described spectral characteristics when used alone. Can not. Further, when the content of the pigment is increased to satisfy the spectral characteristics, there is a problem that the light transmittance of the filter layer is reduced and the brightness of the liquid crystal color display is reduced.

[0005]

Therefore, for example, the red filter layer and the green filter layer contain a yellow pigment as an auxiliary pigment in addition to a red pigment or a green pigment, and the blue filter layer contains a main pigment. Attempts have been made to obtain excellent spectral characteristics by including a violet pigment as an auxiliary pigment in addition to a certain blue pigment.

[0006] Among the pigments used as auxiliary pigments, a yellow pigment has a wavelength of 6 in the red filter layer.
Leakage of light at wavelengths of 460 nm and 540 nm is prevented while maintaining the transmittance of light at 10 nm. Further, the yellow pigment prevents light leakage at a wavelength of 460 nm in the green filter layer. On the other hand, the violet pigment has a wavelength of 540 nm while maintaining the transmittance of light having a wavelength of 460 nm.
Prevents light leakage at m. Therefore, by blending the auxiliary pigment in a predetermined ratio, the color purity in the filter layer of each color can be increased, and the contrast of the liquid crystal color display can be improved.

Examples of the production of a color filter using the above-mentioned yellow pigment or violet pigment as an auxiliary pigment include:
For example, it is disclosed in Japanese Patent Application Laid-Open No. 7-258592. However, disazo yellow pigments such as Color Index (CI) Pigment Yellow 83, 12, 13, 14, 17, 55, and 87 used as yellow pigments in the above publication have sufficient heat resistance. However, when heated to 200 ° C. or higher (CI Pigment Yellow 83 represented by the following formula (1) is 160 ° C. or higher) while being contained in the polymer, the polymer is soluble in a polymer solvent or a dilute acid. It decomposes into a monoazo compound represented by the following formula (2). The monoazo compound (2) is further decomposed at 240 ° C. or higher into dichlorobenzidine having carcinogenicity represented by the following formula (3). For this reason,
It has been reported that it is not preferable to use a disazo yellow pigment when a heating process is performed at a temperature of 200 ° C. or more from the viewpoints of safety and environment (thermal decomposition of a diallyl pigment, ETAD INFORMATION NOTICE No. 2, 1990). , ETA
D pigment standing committee).

[0008]

Embedded image

The manufacturing process of the liquid crystal cell is generally 200
It has a heat treatment step at a temperature of not less than ° C. Therefore, it is not preferable to use the disazo yellow pigment for a color filter. Accordingly, an object of the present invention is to provide a color filter which has high safety against carcinogenicity and the like and has excellent spectral characteristics.

[0010]

Means for Solving the Problems The present inventors have found that as an auxiliary pigment which replaces the bisazo-based yellow pigment, it has no carcinogenic properties or decomposition products having carcinogenic properties, and has a spectral characteristic. In order to provide a yellow pigment suitable for improving the, while examining various pigments,
As a result of repeated studies on the content of the main pigment and the auxiliary pigment from the viewpoint of obtaining excellent spectral characteristics, (i) as the yellow pigment, isoindolin-based or isoindolinone-based yellow pigment is preferable, And (ii)
By setting the content of the auxiliary pigment to be a predetermined ratio with respect to the content of the main pigment, a new fact that a color filter having excellent spectral characteristics can be obtained has been found, and the present invention has been completed. Reached.

That is, the color filter of the present invention is a color filter in which a filter layer containing at least a binder resin and a pigment is formed on the surface of a transparent substrate, wherein the filter layer comprises an anthraquinone red pigment, an isoindoline type and / or Or an isoindolinone-based yellow pigment in a proportion of 20 to 60% by weight, and the content of the yellow pigment is 20 to 60% of the content of the red pigment.
50% by weight of a red filter layer, a halogenated phthalocyanine-based green pigment, and an isoindoline-based and / or isoindolinone-based yellow pigment in a proportion of 20 to 60% by weight, and the content of the yellow pigment is 20 to 60% by weight. A green filter layer having a content of the green pigment of 5 to 40% by weight, a phthalocyanine-based blue pigment and a dioxazine-based violet pigment in a ratio of 10 to 45% by weight, and the content of the violet pigment is the same It is characterized by including a blue filter layer having a content of the blue pigment of 1 to 40% by weight.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The pigment used in the present invention has various characteristics required for color filters for liquid crystal color displays, such as high transparency, heat resistance, chemical resistance and light resistance. And a pigment which does not produce carcinogenicity or generate decomposition products having carcinogenicity. The color index (CI) name of the pigment that can be used in the present invention is shown for each color.

[Yellow pigment] C.I. I. Pigment Yellow 139 (Patriol Yellow D18 manufactured by BASF)
Isoindoline-based yellow pigments such as C.19, L1820 and L2140HD); I. Pigment Yellow 109 (Irgazine Yellow 2GLTE, 2GLTN, Ciba-Geigy, Rionogen Yellow 3GX, Toyo Ink), C.I. I.
Pigment Yellow 110 (Irgazine Yellow
2RLT, 3RLTN, Fast Gen S Yellow GR-GRO, GROH manufactured by Dainippon Ink and Chemicals, Rionogen Yellow RX, RX-F), C.I. I. Pigment Yellow 173
Isoindolinone-based yellow pigments (Red Pigment) such as C.I. I. Pigment Red 177 (Chromophthal Red A2B, A3B manufactured by Ciba Geigy, Irgagin Red A2BN manufactured by Ciba Geigy, India Fast Red R6340 manufactured by Bayer, Fastgen S Red ATY, ATY-ATY manufactured by Dainippon Ink and Chemicals, Inc.) Anthraquinone red pigments [green pigments] C.I. I. Pigment Green 7 (BA
Heliogen Green L8605, L8690 manufactured by SF Co., C.I.
I. Pigment Green 36 (Heliogen Green L9140, L9361 mentioned above, Lionol Green 6YKP-N manufactured by Toyo Ink Co., Ltd.) and the like [Blue Pigment] I. Pigment Blue 15: 1 (B
ASF Heliogen Blue L6900, L6880), C.I.
I. Pigment Blue 15: 2 (Heliogen Blue L6875F, L6980F described above), C.I. I. Pigment Blue 1
5: 3 (Heliogen Blue L7020, L7080 mentioned above),
C. I. Pigment Blue 15: 4 (Heliogen Blue L7101F described above), C.I. I. Pigment Blue 15: 6
(Violet pigment) such as phthalocyanine-based blue pigments (Heliogen Blue L6700F, Lionol Blue ES manufactured by Toyo Ink Co., Ltd.) I. Dioxazine-based violet pigments such as C.I. Pigment Violet 23 (Hosta Palm Violet RL Special manufactured by Hoechst, Microsol Violet B manufactured by Ciba Geigy) Next, the content of the pigment in each of the red, green and blue filter layers And a preferred range of the ratio of the auxiliary pigment to the main pigment. The content of the auxiliary pigment is set according to the content of the main pigment.

(1) Red Filter Layer In the red filter layer, the anthraquinone red pigment exemplified above is used as a main pigment. As the auxiliary pigment, one selected from the above-listed isoindoline-based yellow pigments and isoindolinone-based yellow pigments, or a mixture of two or more of them is used.

The content ratio of the total amount of the red pigment and the yellow pigment in the red filter layer is set to 20 to 60% by weight, preferably 25 to 40% by weight. If this ratio exceeds 60% by weight, the peak of the spectral transmittance at a wavelength of 610 nm decreases, and the light transmittance of the red filter layer decreases, which causes a problem that the brightness of the liquid crystal color display decreases. On the other hand, when the ratio is 10
If the content is less than 10% by weight, the spectral transmittance with respect to wavelengths of 460 nm and 540 nm becomes relatively high, and the color purity of the red filter layer is reduced.

The yellow pigment as the auxiliary pigment is contained in the red filter layer at a ratio of 20 to 50% by weight, preferably 25 to 45% by weight, based on the content of the red pigment as the main pigment. If this ratio exceeds 50% by weight, the wavelength 6
Since the peak of the spectral transmittance with respect to 10 nm decreases, the brightness of the liquid crystal color display decreases, which is not preferable. On the other hand, when the ratio is less than 20% by weight, 610%
The spectral transmittance on the shorter wavelength side (such as yellow light) than nm is relatively high, the color purity of the red filter layer is reduced, and the contrast of the liquid crystal color display is reduced.

(2) Green Filter Layer In the green filter layer, the halogenated phthalocyanine-based green pigment exemplified above is used as the main pigment. As the auxiliary pigment, one selected from an isoindoline-based yellow pigment and an isoindolinone-based yellow pigment, or a mixture of two or more selected from the group is used.

The content ratio of the total amount of the green pigment and the yellow pigment in the green filter layer is 10 to 40% by weight,
Preferably, it is set to be 15 to 35% by weight.
If this ratio exceeds 40% by weight, the peak of the spectral transmittance at a wavelength of 540 nm decreases, and the light transmittance of the green filter layer decreases, so that the brightness of the liquid crystal color display decreases. On the other hand, if the ratio is less than 10% by weight, the spectral transmittance for wavelengths of 460 nm and 610 nm becomes relatively high, the color purity of the green filter layer is reduced, and the contrast of the liquid crystal color display is reduced.

The yellow pigment, which is an auxiliary pigment, is contained in the green filter layer at a ratio of 5 to 40% by weight, preferably 10 to 35% by weight, based on the content of the green pigment which is the main pigment. If this ratio exceeds 40% by weight, the wavelength 5
The peak of the spectral transmittance at 40 nm decreases, and the brightness of the liquid crystal color display decreases. on the other hand,
If the ratio is less than 5% by weight, the spectral transmittance on the shorter wavelength side than 540 nm becomes relatively high, the color purity of the green filter layer is reduced, and the contrast of the liquid crystal color display is reduced.

(3) Blue filter layer In the blue filter layer, the phthalocyanine blue pigment exemplified above is used as the main pigment, and the dioxazine violet pigment exemplified above is used as the auxiliary pigment. The content ratio of the total amount of the blue pigment and the violet pigment in the blue filter layer is 5 to 30% by weight, preferably 10 to 30% by weight.
２５25% by weight. This ratio is 30
When the content is more than 10% by weight, the peak of the spectral transmittance at a wavelength of 460 nm decreases, and the light transmittance of the blue filter layer decreases. On the other hand, if the ratio is less than 5% by weight, the wavelength 5
The spectral transmittance for 40 nm and 610 nm becomes relatively high, and the color purity of the blue filter layer is reduced, and the contrast of the liquid crystal color display is reduced.

The violet pigment as the auxiliary pigment is 1 to 40% by weight based on the content of the blue pigment as the main pigment.
Preferably, it is contained in the blue filter layer at a ratio of 5 to 30% by weight. If this ratio exceeds 40% by weight, the wavelength 4
The peak of the spectral transmittance for 60 nm is reduced, and the brightness of the liquid crystal color display is reduced. on the other hand,
If the ratio is less than 1% by weight, the spectral transmittance on the longer wavelength side than 460 nm becomes relatively high, the color purity of the blue filter layer is reduced, and the contrast of the liquid crystal color display is reduced.

The color filter layer of the present invention may contain other pigments such as extender pigments in the filter layer of each color as long as the effects of the present invention are not impaired. However, if the content of the extender pigment in the filter layer is increased, the spectral characteristics may be deteriorated. Therefore, it is preferable that the extender pigment is not contained as much as possible. That is, in the present invention, the content of the extender pigment is 50% of the total weight of the ink.
% By weight, preferably 30% by weight or less.

As the above-mentioned extender, those which are transparent and have a small particle size are preferred. Varifine BF-1 and BF-10) manufactured by Kogyo Co., Ltd., and the like, but are not limited thereto. The binder resin used in the present invention preferably has excellent properties such as transparency, heat resistance, light resistance, solvent resistance, chemical resistance, adhesiveness to a transparent substrate, and pigment dispersibility. For example, polyester-melamine resin, melamine resin, epoxy resin, epoxy-melamine resin and the like can be mentioned. These resins are used alone or in combination of two or more. Further, a curing catalyst such as an acid catalyst may be appropriately contained in the resin for the purpose of adjusting the curing speed of the resin.

In order to improve the transmittance of the color filter and brighten the display of the liquid crystal color display, it is appropriate that the average particle size of the pigment in the filter layer is 1 μm or less, preferably 0.5 μm or less. . Further, when a pigment having a particularly large particle size is contained in the filter layer, the thickness of the filter layer is partially increased, and the transparent electrodes (ITO films) formed on both sides of the liquid crystal layer are short-circuited.
In a liquid crystal display, a portion where ON / OFF of a pixel becomes impossible, that is, a defect of a foreign substance is caused. Therefore,
The content of particles having a particle size of 1 μm or less is 80% or more, preferably 9% or more.
It is appropriate to adjust so as to be 0% or more.

In the production of a color filter by a printing method, an ink for a color filter is used for producing a filter layer. Such an ink is obtained by stirring the above exemplified pigment, extender pigment, resin and solvent with a mixer and dispersing the pigment in the resin. The ink for a color filter, in the binder resin exemplified above, a main pigment, an auxiliary pigment, a solvent and, if necessary, an extender pigment are blended, and two rolls, three rolls, a kneader, a planetary mixer, a Banbury mixer, It is obtained by mixing with various mixers such as a bead mill and an annular type mill.

Examples of the solvent include glycol ethers and glycol esters. As glycol ethers, for example, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether And the like. As glycol esters, for example, ethylene glycol monomethyl ether acetate,
Ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, triethylene glycol monomethyl ether acetate, triethylene glycol monoethyl ether acetate,
Triethylene glycol monobutyl ether acetate and the like. A higher alcohol, a high boiling point hydrocarbon, or the like may be appropriately added to the glycol ethers or glycol esters.

The amount of the pigment, extender and resin in the ink is determined in consideration of the amount of loss of the solvent. That is, when the color filter ink is printed and heated and dried to produce a filter layer, the content of the pigment and the like in the filter layer is set to fall within the above range. In addition, when the pigment is dispersed in the ink, if various dispersants (surfactants) and the like are added, the pigment can be uniformly dispersed in the ink.
The average particle size of the pigment in the filter layer can be set in the above range.

As a printing method used for producing a color filter, there are usually a waterless lithographic offset printing method and an intaglio offset printing method. From the viewpoints of linearity of a printing line and uniformity of an ink film thickness, etc. Intaglio offset printing is preferably used. In the intaglio offset printing method, printing is performed by filling the concave portions of the intaglio with a color filter ink, then transferring the ink to the surface of the blanket, and then transferring the ink to the surface of the transparent substrate.

As the intaglio used for the printing, as a substrate, for example, glass such as soda lime glass, non-alkali glass, quartz glass, low alkali glass, and low expansion glass; fluororesin, polycarbonate resin, polyether sulfone resin, polyether Examples thereof include resins using metals such as methacrylic resins; metals such as stainless steel, copper, and low-expansion alloy invar. Above all, it is preferable to use soft glass such as soda lime glass in order to reproduce a fine pattern with high accuracy.

The concave portions of the intaglio are made according to the pattern of the filter layer. The depth of the recess is usually 1-1.
The thickness is set in the range of 5 μm, preferably 5 to 10 μm according to the thickness of the filter layer. Examples of the shape of the pattern include a stripe pattern. The width of the pattern (that is, the width of the concave portion) varies depending on the size of the color filter, but is generally set in the range of 5 to 70 μm, preferably 10 to 30 μm.

Examples of a method for filling the concave portions of the intaglio with ink include a method of squeegeeing using a doctor blade, a method of using screen printing, a method of injecting with a dispenser (injector), and a method of injecting with a bubble jet. . Examples of the blanket used for the printing include a conventionally known blanket in which a surface rubber layer made of rubber such as silicone rubber or acrylonitrile-butadiene rubber (NBR) is supported on the surface of a support such as a plastic film. Further, a porous sponge layer may be provided between the surface rubber layer and the support or on the back surface of the support. The foaming ratio and the like of the sponge layer are set in consideration of the printing characteristics of the blanket.

The surface rubber layer of the blanket preferably has a smooth surface in order to improve the flatness of the surface of the filter layer. For example, it is appropriate that the blanket has a surface roughness of 0.5 μm or less, particularly 0.3 μm or less. In addition, hardness (JIS)
Spring hardness H _S described in K 6253 _-1988 , JIS
When a silicone rubber having A) of 20 to 80, particularly 40 to 60 is used, the transfer of the ink is good, and the ink transferred from the intaglio can be completely transferred to the surface of the transparent substrate. Further, since the ink is not divided between the blanket and the transparent substrate, there is an effect that the edge of the line becomes sharp. This effect is obtained when the line width of the pattern is 5
This is remarkable in printing a fine pattern of 0 μm or less.

As the above-mentioned silicone rubber, for example, millable silicone rubber, RTV silicone rubber, electron beam-curable silicone rubber and the like can be used. Further, in order to adjust the hardness of the silicone rubber to the above range, silicone oil, silicone gel or the like may be appropriately blended.
As a blanket support, for example, polyethylene,
In addition to plastic films such as polyethylene terephthalate (PET), polyether sulfone (PES), and polycarbonate (PC), metal plates such as aluminum and stainless steel are used.

The transparent substrate used in the above printing includes:
Those having high transmittance to light having a wavelength of 400 to 700 nm are preferable. For example, glass substrates such as non-alkali glass, soda lime glass, and low alkali glass, and films such as polyether, polysulfone, and polyarylate are suitably used. The surface of the transparent substrate needs to be sufficiently cleaned so that the ink can be easily received. Further, in order to facilitate the transfer of the ink, it is also possible to form an adhesive layer made of a transparent and highly heat-resistant resin on the surface of the transparent substrate. When an adhesive layer is formed on the surface of the transparent substrate, the ink can be sufficiently transferred to the surface of the transparent substrate even if the ink surface has low adhesiveness. No remaining so-called piling occurs.

The transparent and heat-resistant resin used for the adhesive layer is, specifically, 400 to 700 nm.
It is necessary to satisfy the condition that the transmittance is reduced by not more than 10% in the above-mentioned wavelength range even if the heat treatment is performed at 220 ° C. for 1 hour.
As the resin satisfying the above conditions, for example, acrylic resin, polyester resin, melamine resin, epoxy resin,
Phenol resins, polyimide resins or mixtures thereof are mentioned. As a resin coating method, various conventionally known coating methods such as dipping, spin coating, and roll coating can be used. The thickness of the adhesive layer is suitably 1 to 10 μm, preferably 3 to 8 μm. When the thickness of the adhesive layer falls below the range,
Unevenness may occur in the transfer of the ink. On the other hand, if the thickness of the pressure-sensitive adhesive layer exceeds the above range, the transmittance of the resin is reduced, and the flatness of the surface is also reduced.

The color filter ink printed on the surface of the transparent substrate is usually from 180 to 250 ° C. and from 30 to 180 ° C.
Cured by heating and drying at 200-230 ° C for 50-80 minutes. Thus, a filter layer is formed on the surface of the transparent substrate.

[0037]

【Example】

(Preparation of Color Filter Ink) As the resin in the color filter ink, a thermosetting resin synthesized as described below was used. First, trimellitic anhydride 17
0 parts, 16 parts of phthalic anhydride, 16 parts of adipic acid, 270 parts of neopentyl glycol and 40 parts of xylene were mixed, and heated and refluxed at 200 ° C. for 2 hours in a nitrogen atmosphere to carry out polymerization. Next, 140 parts of diethylene glycol monobutyl ether was added to the polyester-melamine resin thus obtained, and after cooling to 70 ° C, 160 parts of hexamethoxymethylolmelamine was added.
The resin was crosslinked by reacting for hours.

Next, a pigment, an extender (dry silica, Aerosil A200 described above) and a solvent (diethylene glycol monobutyl ether) are mixed with the thermosetting resin, and the average of the pigment in the ink is further reduced with three rolls. The mixture was stirred until the ratio of the pigment having a particle diameter of 1 μm or less and the particle diameter of 1 μm or less became 80% or less, and the pigment was dispersed to obtain an ink for forming a filter layer for each color.

The pigments used are as follows. An ink for forming a red filter layer (hereinafter referred to as ink for a red filter layer) includes an anthraquinone-based red pigment (CI Pigment Red 177, Chromophtal Red A3B described above) and an isoindoline-based pigment. A yellow pigment (CI Pigment Yellow 139, Patriol Yellow L1820 described above) was blended. Inks for producing a green filter layer (hereinafter referred to as green filter layer ink) include halogenated phthalocyanine-based green pigments (CI Pigment Green 36, Heliogen Green L9361 described above) and isoindoline-based pigments. A yellow pigment (CI Pigment Yellow 139, Patriol Yellow L1820 described above) was blended. As an ink for producing a blue filter layer (hereinafter referred to as an ink for a blue filter layer), a phthalocyanine blue pigment (C.I.
Pigment Blue 15: 6, Lionol ES mentioned above)
And a dioxazine-based violet pigment (CI Pigment Violet 23, Hosta Palm Violet RL Special as described above).

(Preparation of Filter Layer) A filter layer was prepared for each color using the color filter ink of each color. The printing conditions for producing the filter layer are described below. Printing was performed by an intaglio offset printing method using a normal flatbed printing machine. The intaglio plate used was a metal plate in which concave portions having a line width of 120 μm and a depth of 7 μm were formed at intervals of 300 μm. The blanket is a silicone blanket manufactured by Sumitomo Rubber Industries, Ltd. (thickness: 1 mm, spring hardness of silicone rubber H _S (JISA) 50 degrees).
It was used. For the transparent substrate, non-alkali glass (Corning's model # 7059, thickness 1.1 mm) was used.

The ink film printed on the transparent substrate is subjected to a flattening treatment, the thickness of the ink film is adjusted to 1.5 mm, and the ink is further dried in a clean oven at 220 ° C. for 1 hour. I let it. (Evaluation of spectral characteristics) The red filter layer (sample numbers R-1 to R-33), green filter layer (sample numbers G-1 to G-30), and blue filter layer (sample) For Nos. B-1 to B-23), the spectral transmittance at each wavelength of 460 nm, 540 nm and 610 nm was measured using a spectroscopic microscope MCPD-2000 manufactured by Otsuka Electronics Co., Ltd. The evaluation of the spectral characteristics differs depending on the filter layer of each color. Evaluation criteria are as shown in Tables 1, 6 and 11 below.

For the evaluation of the spectral characteristics, a filter layer (sample) was prepared 100 times for one type of color filter ink, and the average value of the evaluation results for each sample was shown. In addition, in each evaluation item, evaluation below x is 1
If there is more than one, it is not practical. The evaluation results of the spectral characteristics of the examples of manufacturing the filter layers of the respective colors are shown below.

The evaluation of the spectral characteristics of the red filter layer was performed according to the criteria shown in Table 1. In the spectral characteristics of the red filter layer, the wavelengths are 460 nm and 540 nm.
Are the light leak rates to blue light and green light, respectively.

[0044]

[Table 1]

The results of the evaluation of the spectral characteristics of the sample numbers R-1 to R-33 (red filter layer) are shown by the composition ratio (parts by weight) of each component in the red filter layer, the red pigment and the yellow pigment in the red filter layer. Of the total amount (R +
Table 2 to Table 5 show the ratio of the content of the yellow pigment to the content of the red pigment (Y / R, wt%).

[0046]

[Table 2]

[0047]

[Table 3]

[0048]

[Table 4]

[0049]

[Table 5]

The evaluation of the spectral characteristics of the green filter layer was performed according to the criteria shown in Table 6. In the spectral characteristics of the green filter layer, the wavelengths are 460 nm and 610 nm.
Indicates the light leak rate to blue light and red light, respectively.

[0051]

[Table 6]

The evaluation results of the spectral characteristics of Sample Nos. G-1 to G-30 (green filter layer) were calculated based on the composition ratio (parts by weight) of each component in the green filter layer, the green pigment and the yellow pigment in the green filter layer. Content ratio of the total amount (G
+ Y,% by weight) and the ratio of the yellow pigment content to the green pigment content (Y / G,% by weight) are shown in Tables 7 to 10.

[0053]

[Table 7]

[0054]

[Table 8]

[0055]

[Table 9]

[0056]

[Table 10]

The evaluation of the spectral characteristics of the blue filter layer was performed based on the criteria shown in Table 11. In the spectral characteristics of the blue filter layer, a wavelength of 540 nm and a wavelength of 610 nm
The transmittance for m indicates the light leak rate to red light and green light, respectively.

[0058]

[Table 11]

The evaluation results of the spectral characteristics of Sample Nos. B-1 to B-23 (green filter layer) were calculated based on the composition ratio (parts by weight) of each component in the blue filter layer, the blue pigment and the violet pigment in the blue filter layer. Are shown in Tables 12 to 14 together with the total content (B + V, wt%) and the ratio of the violet pigment content to the blue pigment content (V / B, wt%).

[0060]

[Table 12]

[0061]

[Table 13]

[0062]

[Table 14]

The filter layers of the respective colors have safety against carcinogenicity even after undergoing a heat treatment step at a high temperature in a liquid crystal cell manufacturing process or the like. In the filter layer, sample numbers R-1 to R-12 and G-1 in which the total content of the main pigment and the auxiliary pigment and the content ratio of the auxiliary pigment with respect to the content of the main pigment were set in the above ranges. ~ G-13
And the filter layers of B-1 to B-11 are as shown in Table 2 above.
As is clear from 5, 7 to 10, and 12 to 14, all have excellent spectral characteristics.

Accordingly, sample numbers R-1 to R-12, G-
1 to G-13 and B-1 to B-11, color filters obtained by appropriately combining three color filter layers of red, green and blue have excellent spectral characteristics in all color filter layers. , The contrast of the liquid crystal color display could be improved.

[0065]

The ink for a liquid crystal color filter of the present invention has the effects of high safety against carcinogenicity and the like and excellent spectral characteristics. Therefore, a liquid crystal color display having excellent contrast can be obtained by using the color filter of the present invention.

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Claims (3)

[Claims] 1. A color filter in which a filter layer containing at least a binder resin and a pigment is formed on the surface of a transparent substrate, wherein the filter layer comprises an anthraquinone-based red pigment, an isoindoline-based and / or isoindolinone-based yellow pigment. And 20 ~
A red filter layer containing 60% by weight and the yellow pigment content of 20 to 50% by weight of the red pigment content; a halogenated phthalocyanine-based green pigment; An indolinone-based yellow pigment in a proportion of 20 to 60% by weight, and the content of the yellow pigment is 5 to 4 of the content of the green pigment.
0% by weight of a green filter layer, and a phthalocyanine blue pigment and a dioxazine violet pigment
A color filter, comprising a blue filter layer containing 0 to 45% by weight and having a violet pigment content of 1 to 40% by weight of the blue pigment content. 2. The method according to claim 1, wherein the binder resin is at least one selected from the group consisting of polyester-melamine resin, melamine resin, epoxy resin and epoxy-melamine resin.
The color filter according to claim 1, which is a seed. 3. A pigment having a particle size of 1 among the pigments in the filter layer.
The color filter according to claim 1, wherein the pigment having a size of μm or less is 80% or more.