JP2003177231A - Color filter for reflective liquid crystal display device and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color filter for a reflective liquid crystal display device with an extremely small quantity of a development residue in forming a red coloring layer and a method for manufacturing the same. <P>SOLUTION: The color filter for the reflective liquid crystal display device characterized by being provided with the red coloring layer containing C.I. Pigment Red 254 or C.I. Pigment Red 209 and the method for manufacturing the same are provided. <P>COPYRIGHT: (C)2003,JPO

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 reflective liquid crystal display device in which a development residue is less likely to be formed when a red coloring layer is formed, and in particular, the development residue of the red coloring layer is extremely small. The present invention relates to a color filter for a reflection type liquid crystal display device which has a vivid color and has few display defects.

[0002]

2. Description of the Related Art As a method for manufacturing a color filter, a dyeing method, a pigment dispersion method, a colored photosensitive material method, and a printing method are known, but the pigment dispersion method is generally widely used. In this pigment dispersion method, for example, a red colored layer composition is applied onto a substrate, prebaked, exposed, developed, and dried to form a red colored layer, and then the same steps are repeated twice. By forming the green colored layer and the blue colored layer with, a color filter having colored layers of three colors is manufactured.

However, when a development residue is generated during the development of the red coloring layer, not only the adhesion to the green coloring layer, the blue coloring layer and the protective film, which will be formed later, is deteriorated, but also the color There was a problem that the color of the filter deteriorated.

In the past, transmissive liquid crystal display devices have been the mainstream, but nowadays many reflective liquid crystal display devices are in circulation due to the mobile use. This reflective liquid crystal display device uses external light to display without using a backlight.
Since the brightness of the reflective liquid crystal display device that uses external light without a backlight is lower than that of the transmissive liquid crystal display device that uses a backlight, the color is lighter than that of the transmissive liquid crystal display device. Subtle changes in color appear in the filter. For this reason, when the development residue is generated, such a change in color appears remarkably, and there is a problem that the deterioration in color appears on the surface.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and when forming a red colored layer, a color filter for a reflection type liquid crystal display device having an extremely small development residue and its manufacture. The purpose is to provide a method.

[0006]

In order to achieve the above object, the present invention provides a C.I.P.
gment Red 254 or CI Pigment
Provided is a color filter for a reflective liquid crystal display device, which is provided with a red colored layer containing Red209.

In the present invention, CI Pigment
Red 254 or CI Pigment Red2
Since the red colored layer containing 09 is included, the development residue remaining on the transparent substrate is extremely small. Therefore,
This improves the adhesion to a colored layer or a protective film to be formed later, and when a reflective liquid crystal display device using such a color filter is used, a development residue is mixed as an impurity in the liquid crystal layer, It is possible to provide a reflective liquid crystal display device that is extremely unlikely to cause a defect such as display failure. Also, after forming the red colored layer,
Since the development residue of the red colored layer does not remain in the portion where the colored layer of another color is formed, it is necessary to reduce the tint of each colored layer, which may cause a particularly important color mixture in the color filter for the reflective liquid crystal display device. Therefore, a color filter for a reflective liquid crystal display device having a good tint can be obtained.

In the invention described in claim 1, as described in claim 2, a mode not provided with a black matrix (hereinafter, may be referred to as "BM less").
The color filter for reflective liquid crystal display device is preferable. The development residue of the red colored layer on the black matrix is usually larger than that on the transparent substrate. In the present invention, since the red colored layer containing the pigment as described above is used, the development residue of the red colored layer on the transparent substrate is extremely small. Therefore, by using a BM-less color filter, it is possible to extremely reduce the development residue of the red colored layer as a whole.
It is possible to reduce defects such as a mixture of development residues in the liquid crystal layer and defective adhesion of other layers such as a protective layer. Further, since the reflective liquid crystal display device has lower brightness than the transmissive liquid crystal display device, the black matrix is usually not formed on the color filter. Therefore, also in the present invention, it can be said that such a color filter is suitable.

Further, in the invention described in claim 2, as described in claim 3, the alignment mark is formed by the red colored layer, that is, CI Pigment Red 254 or C. .IP
It is preferably formed by a red colored layer containing IGMENT RED 209. This is CI Pigm
ent Red 254 or CI Pigment R
This is because the red colored layer containing ed209 is less likely to cause a development residue, and thus if the alignment mark is formed by this red colored layer, the contrast can be easily obtained.

Further, in the invention described in any one of claims 1 to 3, as described in claim 4, the red colored layer is formed on the glass substrate or the SiO ₂ layer. What is formed, that is, CI Pigment Red2 on the glass substrate or the SiO ₂ layer
It is preferable that the color filter for a reflective liquid crystal display device has a red colored layer containing 54 or CI Pigment Red 209. This is because the red colored layer containing the above-mentioned red pigment is formed on the glass substrate and the SiO ₂ layer.
This is because when formed on a layer, a development residue is particularly unlikely to occur as compared with the case where a red colored layer is formed on a transparent substrate made of another material.

The present invention also provides a CI Pigment Red 254 or a CI Pigment Red 254.
Pigment Red 209 is applied on the glass substrate or the SiO ₂ layer, the step of curing the applied red color layer forming coating solution in a pattern, and There is provided a method for producing a color filter for a reflective liquid crystal display device, which comprises a step of forming a red colored layer having a step of developing by removing the coating liquid for forming the red colored layer.

In the manufacturing method of the present invention, CI Pi
gment Red 254 or CI Pigment
A step of the red colored layer forming coating solution is applied onto a glass substrate or SiO ₂ layer on containing Red209, a step of developing to a red colored layer forming patterned on the glass substrate or SiO ₂ layer on the Therefore, since the development residue of the red coloring layer does not remain on the glass substrate or the SiO ₂ layer in particular, it is possible to manufacture a high-quality color filter for a reflective liquid crystal display device having an extremely good tint. it can.

In the invention described in claim 5, it is preferable that, as described in claim 6, a step of forming a colored layer of another color is performed after the step of forming the red colored layer.

By doing so, there is no development residue of the red coloring layer on the coated surface of the other coloring layer forming coating liquid which is applied after forming the red coloring layer, and the color mixture in the coloring layer to be formed later is prevented. This is because a problem does not occur, and it is possible to manufacture a reflection type liquid crystal display color filter having an extremely good tint.

In the invention described in claim 5 or 6, it is preferable that in the developing step as described in claim 7, it is developed with an alkaline developing solution. This is because, in the present invention, the development residue of the red colored layer is particularly small during development with an alkaline developing solution.

The present invention further comprises, as described in claim 8, a color filter for a reflection type liquid crystal display device described in any one of claims 1 to 4. Provided is a reflective liquid crystal display device. According to the present invention, it is possible to provide a high-quality reflective liquid crystal display device in which the color of the color filter is good and the amount of impurities mixed in the liquid crystal layer is small.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to CI Pigment.
Red colored layer or CI Pigm containing Red254
The red colored layer containing ent Red 209 was made based on the finding that a residue is less likely to be generated during development, and the present invention is applied to the color filter for a reflection type liquid crystal display device by utilizing this finding. It has been completed.

Hereinafter, the color filter for a reflective liquid crystal display device of the present invention will be described first, and then the manufacturing method thereof will be described.

A. Color Filter for Reflective Liquid Crystal Display Device The color filter for a reflective liquid crystal display device of the present invention can be divided into two embodiments depending on the red pigment used. That is, the color filter for a reflective liquid crystal display device according to the first embodiment of the present invention is a CI Pigment Re
It is characterized by being provided with a red colored layer containing d254. In addition, the color filter for the reflective liquid crystal display device according to the second embodiment of the present invention is CI Pigment.
A red colored layer containing Red209 is provided.

Hereinafter, these inventions will be described in detail for each of the matters constituting the inventions.

1. Red Pigment The red pigment used in the present invention, namely CI Pigm.
ent Red 254 or CI Pigment
The Red 209 is indicated by a color index name. Other pigments described later are also shown by color index names.

As described above, the first embodiment of the present invention is a color filter for a reflective liquid crystal display device having a red colored layer containing CI Pigment Red 254, and the colored layer is a pigment. As CI Pigme
The red colored layer may be composed of only nt Red 254 or the red colored layer containing CI Pigment Red 254 and another red pigment.

The second embodiment is CI Pigmen.
A color filter for a reflective liquid crystal display device, which comprises a red colored layer containing t Red209, and in the colored layer, a CI pigment as a pigment is similarly used.
Even if the red colored layer is made of only Red209, C.I.
It may be a red coloring layer containing I. Pigment Red 209 and another red pigment.

That is, in the present invention, CI Pi
gment Red 254 and CI Pigment R
It is only necessary that the red colored layer contains at least one of ed209.

Here, CI Pigment Red2
54 is a pigment obtained by granulating a diketopyrrolopyrrole compound and subjecting it to surface treatment. An example of this dikedopyrrolopyrrole compound is shown in the following chemical formula (1).

[0026]

[Chemical 1]

The CI Pigmen in the present invention
The t Red 209 is a pigment in which a quinacridone-based compound is made into particles and subjected to surface treatment or the like.
An example of this quinacridone compound is shown in the following chemical formula (2).

[0028]

[Chemical 2]

Further, the color filter for the reflective liquid crystal display device of the present invention is the above-mentioned CI Pigment Red.
254 and / or CI Pigment Red 209.
Other red pigments may be used together.

Other such red pigments include C.I.
Pigment Red 9, 97, 122, 123, 1
49, 168, 177, 180, 192, 215, 21
6,217,220,223,224,226,22
7, 228, 240 and the like.

The red colored layer may be used by adjusting the tint by mixing a red pigment with a yellow pigment. Such yellow pigments include CI Pigment Yellow
w20, 24, 86, 93, 109, 110, 117,
125, 137, 138, 147, 148, 153, 1
54, 166, 168 and the like. Such a yellow pigment, depending on the required red tint, etc.,
70 to 100% by weight of red pigment, 0 to yellow pigment
It is preferably in the range of 30% by weight.

As described above, when a plurality of pigments are mixed in forming the red colored layer, the above CI Pigmen is used.
t Red 254 or CI Pigment Red
The larger the proportion of 209 in the red pigment is, the less a development residue is generated. Therefore, the adhesion of a coloring layer or a protective film to be formed later is improved, and impurities are not mixed into the liquid crystal to cause display failure. Further, it is possible to prevent color mixture from occurring due to the development residue of the red colored layer at the location where another colored layer is formed.

In order to obtain the effects of the present invention as described above,
CI Pigment Red 254 in the red pigment component
And CI Pigment Red 209 are contained in an amount of 80% by weight or more, preferably 100% by weight.

The weight ratio of such a pigment in the red colored layer in the invention can be used in an amount generally used in the colored layer of the color filter for the reflective liquid crystal display device. Specifically, within the range of 10% by weight to 30% by weight, particularly 10% by weight in the red colored layer.
It is preferably in the range of ˜25% by weight.

2. Red Colored Layer The red colored layer used in the present invention contains a binder resin, a monomer, a polymerization initiator and the like as components of the red colored layer in addition to the above pigment.

Here, these binder resins, polyfunctional monomers, polymerization initiators and the like can be used as long as they are generally used in the coloring layer of the pigment dispersion method, and the materials thereof are not particularly limited. Not a thing. Each of these components will be specifically described below.

Binder Resin The binder resin used in the present invention is not particularly limited as long as it is a resin that can be removed by a developing solution during development in the pigment dispersion method.

The molecular weight of the binder resin used in the present invention is in the range of 5,000 to 25,000, particularly 700.
It is preferably in the range of 0 to 16000. When the molecular weight is larger than the above range, there is a high possibility that a residue will remain during development in the photolithography method,
This is because good results may not be obtained even when the above-mentioned pigment is used. On the other hand, when the molecular weight is smaller than the above range, the strength of the colored layer becomes insufficient.

The binder resin used in the present invention is preferably a binder resin which can be developed with an alkaline developing solution as described later. Examples of such binder resin include ethylene-vinyl acetate copolymer, ethylene-vinyl chloride copolymer, ethylene vinyl copolymer, polystyrene, acrylonitrile-styrene copolymer, ABS resin, polymethacrylic acid resin, ethylene methacrylic acid. Resin, polyvinyl chloride resin, chlorinated vinyl chloride, polyvinyl alcohol, cellulose acetate propionate, cellulose acetate butyrate, nylon 6, nylon 66, nylon 12, polyethylene terephthalate, polybutylene terephthalate,
Polycarbonate, polyvinyl acetal, polyether ether ketone, polyether sulfone, polyphenylene sulfide, polyarylate, polyvinyl butyral, epoxy resin, phenoxy resin, polyimide resin, polyamideimide resin, polyamic acid resin, polyetherimide resin, phenol resin, urea Resin, etc.
And polymerizable monomers such as methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, n-propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, sec-butyl acrylate,
sec-butyl methacrylate, isobutyl acrylate,
Isobutyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, n-pentyl acrylate, n-pentyl methacrylate, n-hexyl acrylate, n-hexyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, n-octyl acrylate, n- Octyl methacrylate, n-decyl acrylate, n-decyl methacrylate, styrene, α-methylstyrene, N-vinyl-2-pyrrolidone, glycidyl (meth) acrylate, and at least one of acrylic acid, methacrylic acid, and acrylic acid. Body (eg, M-560 manufactured by Toagosei Kagaku Co., Ltd.)
0), itaconic acid, crotonic acid, maleic acid, fumaric acid, vinylacetic acid, and polymers or copolymers of one or more of these acid anhydrides. In addition, examples thereof include polymers obtained by adding an ethylenically unsaturated compound having a glycidyl group or a hydroxyl group to the above copolymers, but are not limited thereto.

Among the above binder resins, from the viewpoint of compatibility with the monomers used together, polymethyl methacrylate resin, polyethyl methacrylate resin, polymethyl methacrylate resin and polyethyl methacrylate resin Polymer, phenoxy resin, epoxy resin, polycarbonate resin, polystyrene resin, cellulose acetate propionate, cellulose acetate butyrate,
Ethyl hydroxyethyl cellulose, cellulose triacetate and the like can be preferably used. Particularly preferably, polymethylmethacrylate resin, polyethylmethacrylate resin, polystyrene resin, copolymer of methacrylic acid and styrene, glycidylmethacrylate copolymer, phenoxy resin, epoxy resin, and modified products thereof can be used. .

Particularly preferable epoxy resins as the binder resin include Epicoat series manufactured by Mitsubishi Petrochemical Shell Co., Celoxide series manufactured by Daicel Co., Ltd., Epolide series, or bisphenol-A type epoxy resin, bisphenol- F type epoxy resin, bisphenol-S type epoxy resin, novolac type epoxy resin, polycarboxylic acid glycidyl ester, polyol glycidyl ester, aliphatic or alicyclic epoxy resin,
Examples thereof include amine epoxy resins, triphenol methane type epoxy resins, dihydroxybenzene type epoxy resins, and copolymerized epoxy compounds of glycidyl (meth) acrylate and a radically polymerizable monomer.

Such a binder resin is contained in the red colored layer in an amount of 30% by weight to 50% by weight, particularly 30% by weight.
It is preferably used within the range of 40% by weight.

Polyfunctional Monomer As the polyfunctional monomer used in the present invention, any one generally used in the colored layer produced by the pigment dispersion method can be used.

Specifically, allyl acrylate, benzyl acrylate, butoxyethyl acrylate, butoxyethylene glycol acrylate, cyclohexyl acrylate, dicyclopentanyl acrylate, 2-ethylhexyl acrylate, glycerol acrylate, glycidyl acrylate, 2-hydroxyethyl acrylate, 2 -Hydroxypropyl acrylate, isobonyl acrylate, isodexyl acrylate, isooctyl acrylate, lauryl acrylate, 2-
Methoxyethyl acrylate, methoxyethylene glycol acrylate, phenoxyethyl acrylate, stearyl acrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, 1,4-
Butanediol diacrylate, 1,5-pentanediol diacrylate, 1,6-hexanediol diacrylate, 1,3-propanediol acrylate,
1,4-cyclohexanediol diacrylate, 2,
2-dimethylolpropane diacrylate, glycerol diacrylate, tripropylene glycol diacrylate, glycerol triacrylate, trimethylolpropane triacrylate, polyoxyethylated trimethylolpropane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, triethylene Glycol diacrylate, polyoxypropyl trimethylolpropane triacrylate, butylene glycol diacrylate, 1,
2,4-butanetriol triacrylate, 2,2
4-trimethyl-1,3-pentanediol diacrylate, diallyl fumarate, 1,10-decanediol dimethyl acrylate, dipentaerythritol hexaacrylate, and the above acrylate group substituted with a methacrylate group, γ-methacryloxy Propyltrimethoxysilane, 1-vinyl-2-pyrrolidone,
2-hydroxyethyl acryloyl phosphate, tetrahydrofurfuryl acrylate, dicyclopentenyl acrylate, dicyclopentenyloxyethyl acrylate, 3-butanediol diacrylate, neopentyl glycol diacrylate, polyethylene glycol diacrylate, hydroxypivalate ester neopentyl glycol Diacrylate, phenol-ethylene oxide modified acrylate, phenol-propylene oxide modified acrylate, N-vinyl-2-
Pyrrolidone, bisphenol A-ethylene oxide modified diacrylate, pentaerythritol diacrylate monostearate, tetraethylene glycol diacrylate, polypropylene glycol diacrylate,
Acrylate monomers such as trimethylolpropane propylene oxide modified triacrylate, isocyanuric acid ethylene oxide modified triacrylate, trimethylolpropane ethylene oxide modified triacrylate, pentaerythritol pentaacrylate, pentaerythritol hexaacrylate, pentaerythritol tetraacrylate, and these. In which the acrylate group is replaced with a methacrylate group, a urethane acrylate oligomer in which an acrylate group is bonded to an oligomer having a polyurethane structure, a polyester acrylate oligomer in which an acrylate group is bonded to an oligomer having a polyester structure, and an acrylate to an oligomer having an epoxy group Group bonded epoxy acrylate oligomer Urethane methacrylate oligomer in which methacrylate group is bonded to oligomer having polyurethane structure, polyester methacrylate oligomer in which methacrylate group is bonded to oligomer having polyester structure, epoxy methacrylate oligomer in which methacrylate group is bonded to oligomer having epoxy group, acrylate group Examples thereof include a polyurethane acrylate having an acrylate group, a polyester acrylate having an acrylate group, an epoxy acrylate resin having an acrylate group, a polyurethane methacrylate having a methacrylate group, a polyester methacrylate having a methacrylate group, and an epoxy methacrylate resin having a methacrylate group.

The amount of such a monomer used in the colored layer is 30% by weight to 50% by weight, particularly 30% by weight to 4%.
It is preferably within the range of 0% by weight.

Polymerization Initiator The polymerization initiator used in the present invention is not particularly limited, but a photopolymerization initiator is generally used in the pigment dispersion method.

Specific examples of such a photopolymerization initiator include benzophenone, Michler's ketone, N, N 'tetramethyl-4,4'-diaminobenzophenone, 4-methoxy-4'-dimethylaminobenzophenone, 4,
Aromatic ketones such as 4′-diethylaminobenzophenone, 2-ethylanthraquinone and phenanthrene, benzoin ethers such as benzoin methyl ether, benzoin ethyl ether and benzoin phenyl ether, benzoin such as methylbenzoin and ethylbenzoin, 2
-(O-chlorophenyl) -4,5-phenylimidazole dimer, 2- (o-chlorophenyl) -4,5-di (m-methoxyphenyl) imidazole dimer, 2-
(O-Fluorophenyl) -4,5-diphenylimidazole dimer, 2- (o-methoxyphenyl) -4,5
-Diphenylimidazole dimer, 2,4,5-triarylimidazole dimer, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone, 2-trichloromethyl-5-styryl- 1, 3, 4
-Oxadiazole, 2-trichloromethyl-5- (p
-Cyanostyryl) -1,3,4-oxadiazole,
2-trichloromethyl-5- (p-methoxystyryl)
Halomethylthiazole compounds such as -1,3,4-oxadiazole, 2,4-bis (trichloromethyl) -6-
p-methoxystyryl-S-triazine, 2,4-bis (trichloromethyl) -6- (1-p-dimethylaminophenyl-1,3-butadienyl) -S-triazine,
2-Trichloromethyl-4-amino-6-p-methoxystyryl-S-triazine, 2- (naphth-1-yl)
-4,6-bis-trichloromethyl-S-triazine,
2- (4-Ethoxy-naphth-1-yl) -4,6-bis-trichloromethyl-S-triazine, 2- (4-butoxy-naphth-1-yl) -4,6-bis-trichloromethyl- Halomethyl-S-triazine compounds such as S-triazine, 2,2-dimethoxy-1,2-diphenylethan-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropanone , 1,
2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,1-hydroxy-cyclohexyl-phenyl ketone, Irgacure 369
(Ciba Geigy), Irgacure 651 (Ciba Geigy), Irgacure 907 (Ciba Geigy), and other photopolymerization initiators. In the present invention, these photopolymerization initiators can be used alone or in combination of two or more, and the amount of such a polymerization initiator used in the colored layer is 10% by weight to 30%. %, Especially 10
It is preferably within the range of 20% by weight to 20% by weight.

Others In addition to the above-mentioned specific pigment, binder resin, polyfunctional monomer and polymerization initiator, other additives can be added to the red colored layer used in the present invention, if necessary. . As such an additive, for example, when a surfactant is contained as a non-volatile component, as the surfactant, polyoxyethylene alkyl ether, sorbitan fatty acid ester, polyoxyethylene alkyl phenyl ether, linear alkylbenzene sulfonate is used. , Polyethylene glycol and the like can be used.

3. Color Filter Color Filter for Reflective Liquid Crystal Display Device The color filter of the present invention is for a reflective liquid crystal display device. This is due to the following reasons.

That is, in the case of a transmissive liquid crystal display device, sufficient brightness can be secured by backlight light, but in the reflective liquid crystal display device, since external light is used as a light source, the brightness is low. It is often low. Since the backlight is used as described above, the color of the color filter can be darkened in the transmissive liquid crystal display device.
Therefore, even if there is a development residue in the red colored layer,
The change in color due to the development residue is unlikely to cause a serious problem.

On the other hand, the color filter used in the reflection type liquid crystal display device has low luminance as described above and the incident external light is transmitted through the color filter twice. The color is lighter than that of the transmissive liquid crystal display device. Therefore, when there is a development residue in the red colored layer, it has a great adverse effect on the tint of the other colored layers formed thereafter, specifically, the green colored layer and the blue colored layer.

Therefore, as described above, the advantage of using the red coloring layer with less residue during development in the pigment dispersion method is the color filter for the reflection type liquid crystal display device in which the change in tint appears remarkably in quality. By using it for such a color filter for a reflective liquid crystal display device, it is possible to exert its advantages predominantly.

Black Matrix The color filter for reflective liquid crystal display device of the present invention may have a black matrix or may not have a black matrix.

However, a large amount of the development residue of the red coloring layer usually remains on the black matrix. Therefore, in the color filter having the black matrix, even if the development residue of the red colored layer on the transparent substrate is extremely small, the development residue is likely to remain on the black matrix. In particular, since the black matrix as a frame formed outside the pixel region has a large area, the development residue remaining on the black matrix has a great influence.

In such a case, even if a red coloring layer having a very small development residue on the transparent substrate is used, such a development residue as an impurity is mixed into the liquid crystal layer and protection is required. It is difficult to significantly improve the problem that the adhesiveness with other layers such as layers decreases.

On the other hand, in the case of a color filter for a BM-less reflection type liquid crystal display device, by using a red colored layer having very little development residue on a transparent substrate, development residues mixed in as impurities in the liquid crystal layer can be significantly reduced. It is possible to reduce the amount, and it is possible to greatly improve the problem with respect to the adhesion to other layers such as the protective layer.

For this reason, in the present invention,
It is preferable that the red colored layer is used in a BM-less color filter.

With respect to the problem of color mixing between other coloring layers formed after the formation of the red coloring layer and the development residue, the present invention can exert the effect regardless of the presence or absence of the black matrix. Therefore, the present invention is not necessarily limited to the color filter for the BM-less reflective liquid crystal display device.

Alignment Mark In the color filter for a reflective liquid crystal display device of the present invention, particularly in the BM-less color filter as described above, the alignment mark is preferably formed by the above-mentioned red colored layer.

Generally, an alignment mark is formed on the color filter for alignment of the photomask for forming each colored layer and the transparent substrate, for example. Here, the alignment mark is usually a black matrix forming material that provides the best contrast, and is formed when the black matrix is formed. However, in the BM-less color filter, it is costly to perform the black matrix forming step only for this reason. Therefore, when forming each colored layer, the alignment mark is formed by using each colored layer forming material. It may be formed.

In the present invention, the development residue can be extremely reduced by using the above-described specific pigment in the red colored layer. Therefore, by forming an alignment mark with such a red colored layer used in the present invention, it is possible to form an alignment mark having no residue in the surroundings, and since it is easy to obtain contrast, it is effective as an alignment mark. Of.

In the present invention, the alignment mark may be formed only by the red colored layer, but normally, when the other colored layer is formed, another coloring is applied so as to be laminated on the alignment mark of the red colored layer. An alignment mark is formed by the layer material. By doing so, it is possible to easily obtain the contrast of the alignment mark at the time of alignment with the photomask, and it is possible to perform the alignment with high accuracy.

Type of Transparent Substrate In the present invention, the type of transparent substrate on which the colored layer is formed is not particularly limited. For example, various transparent materials are used for the transparent substrate depending on the formation position of the color filter in the reflective liquid crystal display device, as exemplified in the section of the reflective liquid crystal display device described later.

However, since the effect that the development residue of the red colored layer in the present invention is hard to remain is particularly remarkable on the glass substrate or the SiO ₂ film, in the present invention, when the transparent substrate is a glass substrate, Or S
It is preferably an iO ₂ film.

Other Colored Layers In the color filter for a reflective liquid crystal display device of the present invention, a green colored layer and a blue colored layer are formed in addition to the above-mentioned red colored layer.

As the green colored layer and the blue colored layer, those formed of the material generally used for the color filter formed by the pigment dispersion method can be used and are not particularly limited.

As the pigment used in the green colored layer, for example, PG7, PG36, etc. are used. Regarding the binder resin, the monomer, the polymerization initiator and the other additives, the same pigments as those in the red colored layer are used. It can be used in a blending ratio.

The pigment used for the blue colored layer is, for example, PB15 series, PB1, PB19, PB6.
No. 0, PB61, etc., and in this case as well, the same binder resin, monomer, polymerization initiator and other additives as in the red colored layer are used in the same mixing ratio.

Others In the color filter for a reflective liquid crystal display device of the present invention, layers such as a protective layer and a transparent electrode layer are formed in addition to the colored layer as described above. In addition, various functional layers may be formed depending on the reflective liquid crystal display device used.

B. Method for Manufacturing Color Filter for Reflective Liquid Crystal Display Device The method for manufacturing a color filter for a reflective liquid crystal display device according to the present invention includes CI Pigment Red 254 or C.I.
I. Pigment Red 209 containing a coating solution for forming a red colored layer on a glass substrate or a SiO ₂ layer (coating step), and a step of curing the applied coating solution for forming a red colored layer in a pattern It is characterized by including a red color layer forming step having a (curing step) and a step of developing by removing the coating liquid for forming the red color layer in the uncured portion (developing step).

1. Coating Process First, the coating process will be described. The coating step in the present invention is a step of coating a red colored layer forming coating solution containing CI Pigment Red 254 or CI Pigment Red 209 on the glass substrate or the SiO ₂ layer.

The coating liquid for forming the red colored layer used in this step is CI Pigment Re as a red pigment.
d254 or CI Pigment Red 209, but these are the same as those described in the section of "A. Color filter for reflective liquid crystal display device", and therefore the description thereof is omitted here. Further, the fact that these red pigments can be used together with other red pigments and yellow pigments is as described above.

Further, this red colored layer forming coating liquid contains
It contains the same binder resin, polyfunctional monomer, and polymerization initiator as those described in the section of "A. Color filter for reflective liquid crystal display device", and if necessary, the same additives as those described above are added. can do.

As the solvent that can be used in the coating solution for forming a red colored layer of the present invention, those generally used in such a coating solution for forming a colored layer can be used. Specifically, alcohols such as methanol, ethanol, n-propanol, isopropanol, ethylene glycol and propylene glycol, α- or β
-Terpenes such as terpineol, ketones such as acetone, methyl ethyl ketone, cyclohexanone, N-methyl-2-pyrrolidone, aromatic hydrocarbons such as toluene, xylene and tetramethylbenzene, cellosolve, methyl cellosolve, ethyl cellosolve, carbi Thor, methyl carbitol, ethyl carbitol, butyl carbitol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether Glycol ethers such as ethyl acetate, butyl acetate, cellosolve acetate, ethyl cellosolve acetate, butyl cellosol Acetate, carbitol acetate, ethyl carbitol acetate, butyl carbitol acetate, propylene glycol monomethyl ether acetate, acetic acid esters such as propylene glycol monoethyl ether acetate.

The solid content concentration in the coating liquid for forming the red colored layer is usually in the range of 10% to 30%.

The coating liquid for forming the red colored layer in the present invention is applied on the glass substrate or the SiO ₂ layer. This is because, as described above, the advantages of the present invention can be maximized on the glass substrate or the SiO ₂ layer among the transparent substrates.

In the present invention, the SiO ₂ layer is preferably formed by a vacuum film forming method, but is not particularly limited to this and may be formed by a sol-gel method or the like. Good.

2. Curing Step In the present invention, the coating liquid for forming the red colored layer thus coated is cured in a pattern. This curing step is generally performed by exposure using a photomask. Further, the exposure is performed by irradiation with energy for curing these, depending on the composition of the coating liquid for forming the red colored layer used. In general, such a coating liquid for forming a colored layer is ultraviolet curable, and thus ultraviolet rays are irradiated in a pattern.

3. Developing Step Then, after the curing step is completed, a developing step of performing development by removing the coating liquid for forming the red color layer in the uncured portion is performed. The developer used for such development in the present invention is determined according to the composition of the coating solution for forming the red color layer to be used, and it may be a water-based developer or a solvent-based developer. Alternatively, it may be appropriately selected and used according to the type of the resin binder used.

In the present invention, it is preferable to use an aqueous developing solution, and it is particularly preferable to develop with an alkaline developing solution. Examples of such alkaline developers include aqueous solutions of potassium hydroxide, sodium carbonate and the like.

4. Other Colored Layer Forming Order In the method for manufacturing a color filter for a reflective liquid crystal display device of the present invention, in addition to the above-described red colored layer forming step, a colored layer forming step of another color is performed. In the present invention, it is preferable that after the step of forming a red colored layer, the step of forming a colored layer of another color is performed at least once.

The present invention is characterized in that the development residue in the red colored layer forming step is extremely small. As described above, this feature has advantages such as improved adhesion to other layers such as a protective layer and prevention of mixing of residues as impurities into the liquid crystal layer. It can also be an advantage of preventing color mixture between other colored layers formed in and the development residue. In this way, since the residue is extremely small at the time of forming the red colored layer, the tint of the colored layer formed thereafter can be improved. It has the effect of not having an adverse effect.

It is necessary for at least one kind of colored layer forming step to be performed after the red colored layer forming step in order to exhibit such an effect. From this point, the red colored layer forming step described above can be performed. After that, it is preferable that the colored layer forming step of another color is performed at least once.

In general, since the colored layers of the three primary colors of the red colored layer, the green colored layer, and the blue colored layer are formed, in the present invention, the red colored layer is included among these colored layer forming steps. It can be said that the case where it is formed first is the most preferable.

Others In the color filter for a reflective liquid crystal display device of the present invention, other necessary functional layer forming steps such as a protective layer forming step and a transparent electrode layer forming step may be further performed.

C. Reflective Liquid Crystal Display Device Finally, a reflective liquid crystal display device of the present invention using the above-described color filter for reflective liquid crystal display device will be described.

The reflective liquid crystal display device of the present invention is not particularly limited in the structure of the liquid crystal display device as long as it uses the color filter described in the above section "A. Color filter for reflective liquid crystal display device". Not something. Specifically, for example, as shown in FIG. 1, a colored layer 2 including the above-described red colored layer is formed on a glass substrate 1, and a liquid crystal is sealed between the colored layer 2 and the reflective layer 3 to form a liquid crystal layer 4. It may be a reflective liquid crystal display device having a general structure as described above.

As shown in FIG. 2, a reflective layer 3 formed by vapor-depositing aluminum is formed on a base material 5, and a SiO ₂ layer 6 is formed on the reflective layer 3 and then the above-mentioned red coloring layer is formed. And a liquid crystal layer 4 is formed by enclosing a liquid crystal between the color filter side substrate 7 and the electrode side substrate 8.
The reflective liquid crystal display device having the above structure may be used.

In these examples, the above-mentioned red colored layers are respectively formed on the glass substrate or the SiO ₂ layer. Therefore, as described above, since the development residue of the red colored layer is extremely small, it is possible to provide a reflective liquid crystal display device having various advantages of the color filter for a reflective liquid crystal display device described above.

The present invention is not limited to the above embodiment. The above-described embodiments are merely examples, and the present invention has substantially the same configuration as the technical idea described in the scope of claims of the present invention, and has any similar effects to the present invention. It is included in the technical scope of.

For example, in the above description, the photopolymerizable resin is used for the red colored layer, but the present invention is not limited to this, and a thermopolymerizable resin may be used.

[0092]

EXAMPLES The present invention will be described in more detail below with reference to examples.

(Example) (Method for forming red layer) A photosensitive material for red pattern was applied to the entire surface of a glass substrate on which a black matrix was formed (or not formed) by a spin coating method to make it red-sensitive. Forming a conductive resin layer and prebaking (90 ° C x 3
min) was performed. Then, the red photosensitive resin layer was subjected to alignment exposure using a photomask for a predetermined colored pattern, and developed with a developing solution (0.05% KOH aqueous solution).

(Evaluation method) After development, a cylindrical polypropylene material having a diameter of about 6 mm was wrapped with a wipe (Toray's Toraysee MK Clean Cloth), and the entire surface of the wipe was directly sprayed with ethanol from a bottle and wetted with ethanol to give a red photosensitive material. The glass part in which the functional resin layer was not formed by development was reciprocated 3 times on the long side of the glass. At this time, the glass substrate was placed directly on a hard and flat table, and the glass surface was rubbed with a force that would not break the substrate. Then, the wipe was confirmed with a floodlight.

(Evaluation) No color adhered to the wipe.

(Red Photosensitive Paint) Red Pigment: Dikedopyrrolopyrrole Compound (PR254) or Quinacridone Compound (PR209) 4.8 parts by weight Yellow Pigment: Paliotor Yellow manufactured by BASF D1819 1.2 parts by weight Dispersant: Solsperse 24000 3.0 parts by weight of Geneca Co., Ltd. Monomer: SR399 of Sartomer Co., Ltd. 4.0 parts by weight Polymer 1 5.0 parts by weight Initiator: Irgacure 907 1 of Ciba-Gaiki Co. .4 parts by weight Initiator: 2,2-bis (o-chlorophenyl) -4,5,4 ', 5'-tetraphenyl-1,2'-biimidazole 80.0 parts by weight Solvent: Propylene glycol monomethyl ether acetate 80.0 parts by weight The above polymer 1 is benzyl methacrylate: styrene: acrylic acid: 2-hydroxy ether. 2-methacryloyloxyethyl isocyanate was added to 16.9 mol% with respect to 100 mol% of a copolymer of 15.6: 37.0: 30.5: 16.9 (meth). , And the weight average molecular weight is 42,500.

(Comparative Example) A pigment was used R. 177 or P.I. R. 48: 1, the same red layer forming method as in the embodiment,
The evaluation method was performed.

(Evaluation) A red color adhered to the wipe.

[0099]

INDUSTRIAL APPLICABILITY In the present invention, CI Pigmen
t Red 254 or CI Pigment Red
Since the red colored layer containing 209 is provided, the development residue remaining on the transparent substrate is extremely small. Therefore, this improves the adhesion to a colored layer or a protective film that will be formed later, and when a reflective liquid crystal display device is formed using such a color filter, development residues are mixed as impurities in the liquid crystal layer. However, it is possible to provide a reflection type liquid crystal display device in which there is an extremely low possibility of causing a defect such as display failure. In addition, after the red colored layer is formed, the development residue of the red colored layer does not remain at the position where the colored layer of another color is formed, so that it is necessary to reduce the tint of each colored layer. There is an effect that a particularly important color mixture does not occur in the filter, and thus a color filter for a reflective liquid crystal display device having a good tint can be obtained.

[0100]

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a reflective liquid crystal display device using a color filter for a reflective liquid crystal display device of the present invention.

FIG. 2 is a schematic cross-sectional view showing another example of a reflective liquid crystal display device using the color filter for reflective liquid crystal display device of the present invention.

[Explanation of symbols]

1 ...... Glass substrate 2 ...... Coloring layer 3 ...... Reflecting layer 4 ...... Liquid crystal layer 6 ...... Si0 ₂ layer

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2H025 AA04 AB13 AC01 AD01 BC14                       BC32 BC42 BC51 CA01 CA14                       CA28 CB13 CB14 CB16 CB52                       CC12 FA03 FA17                 2H048 BA02 BA11 BA45 BA47 BB01                       BB02 BB42                 2H088 FA16 HA12 MA16                 2H090 JB02 JB04 LA15 LA20                 2H091 FA02Y FB02 FC10 LA07                       LA12

Claims (8)

[Claims] 1. A color filter for a reflective liquid crystal display device, comprising a red colored layer containing CI Pigment Red 254 or CI Pigment Red 209. 2. The color filter for a reflective liquid crystal display device according to claim 1, which does not include a black matrix. 3. The color filter for a reflective liquid crystal display device according to claim 2, wherein an alignment mark is formed by the red colored layer. 4. The red colored layer is formed on a glass substrate or a SiO ₂ layer.
A color filter for a reflective liquid crystal display device according to any one of claims 1 to 3. 5. A step of applying a coating solution for forming a red colored layer containing CI Pigment Red 254 or CI Pigment Red 209 on a glass substrate or an SiO ₂ layer, and for forming the applied red colored layer A reflective liquid crystal comprising a red colored layer forming step including a step of curing the coating liquid in a pattern and a step of developing by removing the coating liquid for forming the red colored layer in an uncured portion. Method for manufacturing color filter for display device. 6. The method of manufacturing a color filter for a reflective liquid crystal display device according to claim 5, wherein a step of forming a colored layer of another color is performed after the step of forming the red colored layer. 7. The method for manufacturing a color filter for a reflective liquid crystal display device according to claim 5, wherein in the developing step, development is performed with an alkaline developing solution. 8. A reflective liquid crystal display device comprising the color filter for a reflective liquid crystal display device according to any one of claims 1 to 4.