JP2007163830A - Color filter and liquid crystal display device equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color filter which does not spoil flatness of an alignment film layer formed on a colored layer even when forming no protection layer on the colored layer, which hardly produces film peeling by a rubbing step of the alignment film and which shows excellent display characteristics. <P>SOLUTION: The color filter has a transparent substrate, a black matrix which is provided on the transparent substrate and has an opening and a plurality of colored layers which are provided at the opening and constitute a color pixel. An end part of the black matrix and an end part of the colored layer come into contact with each other or are laminated and a relation of film thickness: ¾(film thickness of the colored layer)-(film thickness of the black matrix)¾≤0.1μm is satisfied. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device applied to a computer terminal display device, a television image display device, and the like, and a color filter used therefor.

  Color liquid crystal display devices are rapidly spreading mainly in computer terminal display devices and television image display devices. The color filter is an indispensable important component for color display of a liquid crystal display device. In recent years, this liquid crystal display device has a high demand for higher image quality, and various new types of liquid crystal display devices having a high viewing angle and high-speed response have appeared. Among these, the horizontal electric field method (In Plane Switching = IPS method) is a method that is widely used because it has excellent display quality such as viewing angle and contrast ratio.

  Unlike other Twisted Nematic systems (TN systems), Vertical Alignment systems (VA systems), etc., the horizontal electric field type liquid crystal display device does not interpose an electrode between the pixel and the liquid crystal. Since the colored layer of the filter exists, there is a problem that the liquid crystal display molecules are directly affected by the electrical characteristics of the material of the colored layer. In fact, when the conventional colored layer material is used, various display defects occur in the transverse electric field type liquid crystal display device, such as liquid crystal orientation disorder due to the electrical characteristics of the colored layer material, and burn-in phenomenon caused by switching threshold deviation. It was. For this reason, when a color filter made of a conventional colored layer material is used in a horizontal electric field type liquid crystal display device, a protective layer (overcoat layer) made of a transparent resin is provided on the colored layer so that the liquid crystal sandwiching surface and the colored layer are directly It was common to avoid touching.

  On the other hand, with the recent widespread use of liquid crystal display devices, color filters, which are one of the members used in liquid crystal display devices, are also required to be reduced in price. As described above, by providing a protective layer made of a transparent resin, the influence of the colored layer has been conventionally prevented and panelization has been facilitated. However, a horizontal filter using a color filter having a structure without this protective layer is used. There has been a demand for an electric field type liquid crystal display device.

  However, since the above color filter does not provide a protective layer on the pixel, the liquid crystal display device has a level difference between adjacent pixels or a level difference between the black matrix and the pixel, which has been flattened by the conventional protective layer. Will be incorporated into. For this reason, in the rubbing process for manufacturing the liquid crystal element, which is a subsequent process, the alignment film formed on the pixel of the color filter is peeled off, and the alignment of the liquid crystal in the peeled part is disturbed, and the peeled alignment film is reattached. Display defects such as bright spot defects are a problem.

  A proposal has been made to realize a liquid crystal display element free from display defects by eliminating the defects in the rubbing process at the time of manufacturing the liquid crystal display element with the color filter having the black matrix and having no protective layer (for example, Patent Document 1). reference.). The configuration described in Patent Document 1 is characterized by the angle formed between the side surface of the resin black matrix and the transparent substrate, and the angle formed between the upper end surface portion of the resin black matrix and the colored portion. The film thickness of the black matrix, which is suitable for a color filter that forms a colored layer by applying the above, is limited to a thicker film than the colored portion.

Further, it has been proposed that a color filter having a black matrix restricts a step in a pixel of a colored layer caused by overlapping of the black matrix and the colored layer by surface polishing (for example, Patent Document 2, Patent Document 3, and Patent). Reference 4). In addition, a method of removing a bulge caused by overlapping of adjacent colored layers on a black matrix by polishing and flattening has been proposed (see, for example, Patent Document 5 and Patent Document 6). These proposals all limit the inclination angle of the surface from the step or opening in the pixel to the pattern edge, and these proposals do not solve the problem of peeling of the alignment film in the rubbing process. It was.

  Further, in an attempt to flatten the color filter surface in a color filter having a black matrix, Patent Document 7 proposes that the thickness of the colored layer and the thickness of the black matrix are substantially the same. However, this proposal was made mainly to prevent delamination when providing a transparent electrode layer made of ITO, and specific numerical values for solving the problem of peeling of the alignment film in the rubbing process are clearly indicated. It is not sufficient as a proposal to solve the problem.

Patent documents and the like are as follows.
Japanese Patent Application No. 2003-161826 Japanese Patent Laid-Open No. 11-6913 JP-A-11-218607 JP-A-11-218606 JP 09-230124 A JP 2002-236210 A JP 09-189904 A

  The present invention has been made in order to solve the above-described problems. Even if a protective layer is not formed on the colored layer, the alignment of the alignment film formed on the colored layer is not impaired. It is an object of the present invention to provide a color filter that hardly causes film peeling due to a film rubbing process and exhibits excellent display characteristics.

  Further, the present invention does not impair the flatness of the alignment film or the like formed on the colored layer without forming a protective layer on the colored layer, and does not easily cause film peeling in the alignment film rubbing step. An object of the present invention is to provide a liquid crystal display device that includes a color filter and exhibits excellent display characteristics.

  The color filter of the present invention includes a transparent substrate, a black matrix having an opening provided on the transparent substrate, and a plurality of colored layers which are provided in the opening and constitute color pixels. The black matrix and the colored layer are in contact with each other or overlapped with each other, and the film thickness relationship is | colored layer film thickness−black matrix film thickness | ≦ 0.1 μm.

  Another color filter of the present invention is characterized in that a rising height of a portion where the colored layer and the black matrix contact or overlap each other is 0.2 μm or less from the black matrix or the colored layer. .

  Another color filter of the present invention is characterized in that an end surface of a portion where the colored layer and the black matrix are in contact with or stacked on each other has an angle of 2 to 45 ° with respect to the transparent substrate. And

Further, the color filter of the present invention is used for a horizontal electric field type liquid crystal display device without providing a protective layer made of a transparent resin. It is characterized by comprising a color filter not provided.

  When the present invention is used, the alignment film formed on the color filter image is rubbed off in the step of rubbing the alignment film formed on the colored layer without providing a protective layer on the colored layer. It is possible to show good display characteristics without causing it.

  The color filter of the present invention includes a transparent substrate, a black matrix having an opening provided on the transparent substrate, and a plurality of colored layers provided in the opening and constituting color pixels. And the colored layer are in contact with each other or overlapped with each other, and the relationship of the film thickness is | colored layer film thickness−black matrix film thickness | ≦ 0.1 μm.

  According to the color filter and the color filter of the present invention, even if a protective layer is not formed on the colored layer, the flatness of the alignment film formed on the colored layer is not impaired, and the film is peeled off in the alignment film rubbing step. Therefore, it is possible to perform liquid crystal display that is less likely to occur and exhibits excellent display characteristics.

  The liquid crystal display device of the present invention includes the color filter.

  When the liquid crystal display device of the present invention is used, the black matrix of the color filter used and the colored layer are in contact with each other or overlapped with each other, and the relationship of film thickness is | colored layer film thickness-black matrix The film thickness | ≦ 0.1 μm does not impair the flatness of the alignment film formed on the colored layer without forming a protective layer on the colored layer, and the film is peeled off during the rubbing process of the alignment film. Therefore, it is possible to perform liquid crystal display that is less likely to occur and exhibits excellent display characteristics.

  FIG. 1 is a schematic cross-sectional view showing the configuration of an example of a color filter according to the present invention.

  FIG. 2 shows a schematic cross-sectional view in which a portion where the black matrix and the colored layer in FIG. 1 are in contact with each other or stacked is enlarged.

  As shown in FIG. 1, this color filter 10 includes a transparent substrate 1, for example, a striped black matrix 2 provided on the transparent substrate 1, and a plurality of colored layers provided in openings of the black matrix 2. For example, a red colored layer 3R, a green colored layer 3G, and a blue colored layer 3B are included.

  The relationship between the thickness of the colored layer and the black matrix is | colored layer thickness−black matrix thickness | ≦ 0.1 μm. If this film thickness relationship is not satisfied, i.e., | colored layer thickness-black matrix thickness |> 0.1 μm, the strength with which the rubbing roll comes into contact with the black matrix and the colored layer when the alignment film is formed and rubbing is performed. Therefore, the alignment film formed on the thick layer tends to peel off.

  As shown in FIG. 2, the colored layer, for example, the green colored layer 3 </ b> G is in contact with or stacked with the black matrix and the ends of each other. This contact or stacked portion forms a boundary region X having an overlap width. One of the end portions in contact with each other (the colored layer 3G in the case of FIG. 2) overlaps with the other (the black matrix in the case of FIG. 2), and constitutes the surface of this boundary region.

  The rising height of the boundary region is 0.3 μm or less from the black matrix or the colored layer. When the rising height of the boundary region is larger than 0.3 μm, the rubbing roll comes into strong contact only on the boundary region when the alignment film is formed and rubbed, and the alignment film formed on the boundary region is touched. Peeling easily occurs.

  The angle θ formed between the tangent line α in contact with the outline of the 3G end surface and the transparent substrate is 2 to 45 °.

  If this angle is less than 2 °, the edge part becomes extremely thin and the pattern shape tends to deteriorate, and if it exceeds 45 °, this edge part shape becomes abrupt and peeling of the alignment film occurs in the rubbing process. It becomes easy.

  The production of the color filter will be described using an example of a photolithography method.

  First, a transparent substrate on which a black matrix is formed in advance is prepared, and a photosensitive coloring composition is applied on the transparent substrate and prebaked.

  As a means for applying the photosensitive resin, spin coating, dip coating, die coating and the like are usually used. If it is a method which can apply | coat with a uniform film thickness on a 40-60 cm square board | substrate, it will not be limited to these. Moreover, it is preferable to heat a prebaking for 10 to 20 minutes at the temperature of 50-120 degreeC.

  The coating thickness is arbitrary, but considering the spectral transmittance and the like, the thickness after pre-baking is usually about 2 μm. And the photosensitive coloring composition apply | coated on the transparent substrate is exposed through a pattern mask. A normal high-pressure mercury lamp or the like is used as the light source.

  Next, it develops using the developing solution which consists of alkaline aqueous solution. Examples of the developing solution comprising the alkaline aqueous solution include a sodium carbonate aqueous solution, a sodium hydrogen carbonate aqueous solution, or a mixed aqueous solution of both, and a solution obtained by adding an appropriate surfactant to the aqueous solution. And after development, it is washed with water and dried to obtain pixels of any one color.

  By repeating the above-described series of steps, the photosensitive coloring composition and the pattern, and repeating the patterning step as many times as necessary, a colored pattern in which the necessary number of colors are combined, that is, a pixel of a plurality of colors can be obtained.

  The colored layer can contain, for example, a colorant such as a pigment and a photosensitive resin.

  As a method for forming the colored layer, the above-described pigment dispersion method using photolithography is suitable, but any method capable of forming the configuration of the present invention may be used, and in order to control the edge of the black matrix or the colored layer. Polishing can be performed if necessary.

  As a polishing method, for example, mechanical polishing using a flat plate polishing machine, an Oscar polishing machine, or the like can be performed.

  A schematic diagram showing an example of a polishing machine that can be used in the present invention is shown in FIG.

  As shown in the figure, in this polishing machine, for example, a color filter 10 is mounted and fixed as a material to be polished on a circular table 11, and the surface of the polishing pad 13 bonded to the surface plate 12 is added to the surface of the color filter. Pressure, can be contacted. For example, a flexible layer 14 and a hard film layer 15 are interposed between the surface plate 12 and the polishing pad 13, and the undulation of the circular table is absorbed by the flexible layer 14.

While rotating the circular table 11, the surface of the color filter 10 is polished by dropping the polishing liquid on the surface of the color filter 10 and by shaking the surface plate, so that the protrusions generated between the black matrix of the color filter and the colored layers are formed. Can be removed.

  FIG. 4 is a cross-sectional view for explaining an example of polishing to remove protrusions generated between the colored layers of the color filter shown in FIG.

  As shown in the figure, this color filter 10 ′ has a boundary region X ′ whose surface is flattened instead of the boundary region X whose surface is raised by polishing the boundary region between the black matrix and the colored layer. It has the same external appearance as FIG. It can be seen that the rise of the boundary region between the black matrix and the colored layer can be smaller than shown in FIG.

  The overlapping width of the end portions of each other is preferably in the range of 0 to 10 μm.

  Within this range, the alignment film exhibits better display characteristics without causing rubbing peeling, and the process margin of the rubbing process when manufacturing the liquid crystal element can be increased. When the overlap width exceeds 10 μm, the rising of the boundary region is large, the angle of the stacked end portion is difficult to control to 2 to 45 °, and tends to be larger than 45 °.

  Further, the color filter of the present invention is used in a horizontal electric field type liquid crystal display device without providing a protective layer made of a transparent resin.

  FIG. 5 is a cross-sectional view illustrating a configuration of a horizontal electric field type liquid crystal display device as an example of a preferable liquid crystal display device of the present invention.

  The liquid crystal display device 60 is provided with a color filter substrate 40, a counter substrate 50 provided with an electrode that applies an electric field in a direction parallel to the substrate, and a liquid crystal filled between the counter substrates 50. 19.

  The color filter used for the color filter substrate 40 includes a transparent substrate 1, a black matrix 2 provided on one main surface of the transparent substrate 1, and having a plurality of colored layers 3 constituting color pixels in the openings. The black matrix and the colored layer are in contact with or stacked on each other, and the relationship of film thickness is | colored layer film thickness-black matrix film thickness | ≦ 0.1 μm. This color filter substrate 40 is provided with an alignment film 4 on the colored layer 3 of the color filter and a polarizing plate 6 on the other main surface of the transparent substrate 1.

  The counter substrate 50 includes a transparent substrate 8, a common electrode 16 provided on one main surface of the transparent substrate 8, a polarizing plate 9 provided on the other main surface of the transparent substrate 8, and the common electrode 16. The insulating layer 17 is provided so as to cover the pixel electrode 18 provided on the insulating layer 17, and the alignment layer 22 is provided on the insulating layer 17 and the pixel electrode 18. The liquid crystal 19 is disposed between the insulating layer 17 provided with the pixel electrode 18 and the alignment film 4 of the color filter substrate.

    In such a horizontal electric field type liquid crystal display device, the black matrix and the colored layer are in contact with each other or overlapped with each other, and the film thickness relationship is | colored layer thickness−black matrix thickness | ≦ Since the thickness is 0.1 μm, the flatness of the alignment film formed on the color filter is not impaired, the film is hardly peeled off in the alignment film rubbing step, and excellent display characteristics are exhibited.

The transparent substrate used in the present invention preferably has a certain transmittance with respect to visible light, and more preferably has a transmittance of 80% or more. Generally, it may be one used in a liquid crystal display device, and examples thereof include a plastic substrate such as polyester having good transparency and a glass substrate. And what is necessary is just to use what put the pattern by the black photosensitive resin by the well-known method beforehand on a transparent substrate as a black matrix.

  The method for producing the colored layer on the transparent substrate may be any method other than the photolithography method, such as an inkjet method, a printing method, an etching method, a transfer method, an electrodeposition method, or a combination of these methods. Absent. In consideration of high definition, controllability and reproducibility of spectral characteristics, a colored composition in which a pigment is dispersed in a transparent resin together with a photoinitiator and a polymerizable monomer on a transparent substrate. A photoresist method is preferred in which a step of forming a colored layer by coating and forming a film, forming a single color pixel by pattern exposure and development of the colored layer is repeated for each color.

  The colored layer constituting the pixel used in the color filter of the present invention is formed using a photosensitive resin composition having the following composition, for example, when a photosensitive colored composition is prepared and formed by a photolithography method. be able to. In this photosensitive resin composition, a pigment serving as a colored layer is dispersed in a suitable solvent together with a photoinitiator and a polymerizable monomer in a transparent resin. There are various methods for dispersing such as a mill base, three rolls, and a jet mill, and there is no particular limitation.

(Pigment)
Photosensitive coloring composition (pigment) Specific examples of organic pigments that can be used in the photosensitive coloring composition of the present invention are indicated by color index numbers.

  Examples of the red colored layer composition for forming a red filter segment (pixel) include C.I. I. PigmentRed 1, 2, 3, 4, 5, 6, 7, 9, 10, 14, 17, 22, 23, 31, 38, 41, 48: 1, 48: 2, 48: 3, 48: 4, 49, 49: 1, 49: 2, 52: 1, 52: 2, 53: 1, 57: 1, 60: 1, 63: 1, 66, 67, 81: 1, 81: 2, 81: 3, 81: x, 83, 88, 90, 97, 112, 119, 122, 123, 146, 149, 166, 168, 169, 170, 171, 172, 175, 176, 177, 178, 179, 180, 184, 185, 187, 188, 190, 192, 200, 202, 206, 207, 208, 209.210, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, 246, 254, 255, 264, 27 It can be used red pigment 279, and the like. Moreover, a yellow pigment and an orange pigment can be used in combination with the red coloring composition.

  Examples of yellow pigments include C.I. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 20, 24, 31, 32, 34, 35, 35: 1, 36, 36: 1, 37, 37: 1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 86, 93, 94, 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 123, 125, 126, 127, 128, 129, 137, 138, 139, 144, 146, 147, 148, 150, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 171, 172, 17 , And the like 174,175,176,177,179,180,181,182,185,187,188,193,194,199,213,214.

  As an amber pigment, C.I. I. Pigment Orange 2, 5, 13, 16, 17: 1, 31, 34, 36, 38, 43, 46, 48, 49, 51, 52, 55, 59, 60, 61, 62, 64, 71, 73, etc. It is done.

Examples of the green coloring composition for forming the green filter segment include C.I. I. Pigment Green 1, 1: x, 2, 2: x, 4, 7, 10, 36, 37 and the like can be used. The green coloring composition can be used in combination with the same yellow pigment as the red coloring composition.

  Examples of the blue coloring composition for forming the blue filter segment include C.I. I. PigmentBlue1, 1: 2, 1: x, 9: x, 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 22, 24, 24: x, 56, 60, 61, 62, 64, 80, etc., preferably C.I. I. PigmentBlue 15: 6 can be used. In addition, C.I. I. Pigment Violet 1, 1: x, 3, 3: 3, 3: x, 5: 1, 19, 23, 27, 29, 30, 32, 37, 40, 42, 50, etc., preferably C.I. I. PigmentViolet 23 can be used in combination.

  In combination with the organic pigment, an inorganic pigment may be used in combination in order to ensure good coatability, sensitivity, developability and the like while balancing saturation and lightness. Inorganic pigments include yellow lead, zinc yellow, red bean (red iron oxide (III), cadmium red, ultramarine, bitumen, chromium oxide green, cobalt green, etc., metal oxide powder, metal sulfide powder, metal powder, etc. Furthermore, for color matching, a dye can be contained within a range that does not decrease the heat resistance.

(Dispersant)
Moreover, when a pigment is contained, it is necessary to contain a dispersant for dispersing the pigment. As the dispersant, a surfactant, an intermediate of pigment, an intermediate of dye, Solsperse, or the like is used. Although the addition amount of a dispersing agent is not specifically limited, It is preferable to set it as 1-10 mass% with respect to 100 mass% of compounding quantities of a pigment.

(Non-photosensitive resin and / or photosensitive resin)
The transparent resin used for the coloring composition is a resin having a transmittance of 80% or more, preferably 95% or more in the entire wavelength region of 400 to 700 nm in the visible light region. This transparent resin includes a thermoplastic resin, a thermosetting resin, and a photosensitive resin. Moreover, the transparent resin can be used alone or in admixture of two or more monomers or oligomers that are precursors thereof, which are cured by radiation irradiation to form a transparent resin, as necessary.

  Examples of the thermoplastic resin include butyral resin, styrene- (anhydrous) maleic acid copolymer, styrene / styrene sulfonic acid copolymer, ethylene / (meth) acrylic acid copolymer, isobutylene / (anhydrous) maleic acid copolymer. Polymer, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer-polyvinyl acetate, polyurethane resin, polyester resin, acrylic resin, alkyd resin, polystyrene, polyamide resin, rubber resin, ring Examples thereof include a fluorinated rubber resin, celluloses, polyethylene, polybutadiene, and a polyimide resin. Examples of the thermosetting resin include epoxy resins, benzoguanamine resins, rosin-modified maleic acid resins, rosin-modified fumaric acid resins, melamine resins, urea resins, and phenol resins.

  The photosensitive resin suitable for use in the coloring composition means a resin having radical crosslinkability, and a resin having a mass average molecular weight of 5000 to 100,000 having at least one ethylenically unsaturated double bond. Preferably used.

Specifically, a reactive polymer such as an isocyanate group, an aldehyde group, and an epoxy group that can react with the reactive functional group on a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group, and an amino group. A resin in which an ethylenically unsaturated double bond such as a (meth) acryloyl group and a styryl group is introduced into the linear polymer by reacting with a (meth) acrylic compound having benzene or cinnamic acid is used. In addition, a linear polymer containing an acid anhydride such as a styrene-maleic anhydride copolymer or an α-olein-maleic anhydride copolymer is converted into a (meth) acrylic compound having a hydroxyl group such as hydroxyalkyl (meth) acrylate. Half-esterified products are also used.

(Photopolymerizable monomer)
The photopolymerizable monomer is a monomer whose polymerization is induced by radicals. The polymerizable monomer and oligomer that can be used include methyl (meth) acrylate, ethyl (meth) acrylate, 2-hydroxyethyl (meta). ) Acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, cyclohexyl (meth) acrylate, β-carboxyethyl (meth) acrylate, diethylene glycol di (meth) acrylate, glycerol acrylate methacrylate, glycerol dimethacrylate 1,6-hexanediol di (meth) acrylate, triethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, 2-hydroxy- -Acryloylpropyl methacrylate, trimethylolpropane di (meth) acrylate, trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, 1,6-hexanediol diglycidyl ether (Meth) acrylate, bisphenol A diglycidyl ether di (meth) acrylate, neopentyl glycol diglycidyl ether di (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol ethylene Oxide modified penta (meth) acrylate, dipentaerythritol propylene oxide modified penta (meth) acrylate, di Pentaerythritol caprocalactone modified penta (meth) acrylate, tricyclodecanyl (meth) acrylate, ester acrylate, methylolated melamine (meth) acrylate, epoxy (meth) acrylate, urethane acrylate Examples include methacrylic acid esters, reaction products of epoxy group-containing compounds and carboxy (meth) acrylate, and hydroxyl group-containing polyol polyacrylates.

  Also used are (meth) acrylic acid, styrene, vinyl acetate, hydroxyethyl vinyl ether, ethylene glycol divinyl ether, pentaerythritol trivinyl ether, (meth) acrylamide, N-hydroxymethyl (meth) acrylamide, N-vinylformamide, acrylonitrile and the like. It is done. These may be used alone or in combination of two or more.

(Polymerization initiator)
When the composition is cured by ultraviolet irradiation, a photopolymerization initiator or the like is added to the coloring composition. Examples of the photopolymerization initiator include 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, diethoxyacetophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1- Acetophenone compounds such as hydroxycyclohexyl phenyl ketone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, Benzoin compounds such as benzyl dimethyl ketal, benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzoenone, acrylated benzophenone, 4-benzoyl-4'- Benzophenone compounds such as methyldiphenyl sulfide, 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone, thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, isopropylthioxanthone, 2,4-diisopropyl Thioxanthone compounds such as thioxanthone and 2,4-diethylthioxanthone, 2,4,6-trichloro-s-triazine, 2-phenyl-4,6-bis (trichloromethyl) -s-triazine, 2- (p-methoxy) Phenyl) -4,6-bis (trichloromethyl) -s-triazine, 2- (p-tolyl) -4,6-bis (trichloromethyl) -s-triazine, 2-piperonyl-4,6-bis (trichloro) Methyl) -s-triazine, 2,4-bis (trichloro) Til) -6-styryl) -s-triazine, 2- (naphth-1-yl) -4,6-bis (trichloromethyl) -s-triazine, 2- (4-methoxy-naphth-1-yl)- Triazines such as 4,6-bis (trichloromethyl) -s-triazine, 2,4-trichloromethyl- (piperonyl) -6-triazine, 2,4-trichloromethyl (4′-methoxystyryl) -6-triazine Compound, 1,2-octanedione, 1- [4- (phenylthio)-, 2- (O-benzoyloxime)], O- (acetyl) -N- (1-phenyl-2-oxo-2- (4 Oxime ester compounds such as' -methoxy-naphthyl) ethylidene) hydroxylamine, bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide, 2,4,6-to Phosphine compounds such as methylbenzoyldiphenylphosphine oxide, quinone compounds such as 9,10-phenanthrenequinone, camphorquinone, and ethylanthraquinone, borate compounds, carbazole compounds, imidazole compounds, titanocene compounds, and the like are used. . These photopolymerization initiators can be used alone or in combination. The amount of the photopolymerization initiator used is preferably 0.5 to 50% by weight, more preferably 3 to 30% by weight, based on the total solid content of the colored composition.

(Photosensitizer)
Moreover, it is preferable to use together a polymerization initiator and a photosensitizer. As a sensitizer, α-acyloxime ester, acylphosphine oxide, methylphenylglyoxylate, benzyl, 9,10-phenanthrenequinone, camphorquinone, ethylanthraquinone, 4,4′-diethylisophthalophenone, 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone, triethanolamine, methyldiethanolamine, triisopropanolamine, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, 4- Isoamyl dimethylaminobenzoate, 2-dimethylreaminoethyl benzoate, 2-ethylhexyl 4-dimethylaminobenzoate, N, N′-dimethylparatoluidine, 4,4′-bis (dimethylamino) benzophenone, 4,4 ′ -Bis (diethylamino Benzophenone, it may be used in combination of 4,4'-bis (ethylmethylamino) amine compounds such as benzophenone. These sensitizers can be used alone or in combination. The amount of the sensitizer used is preferably 0.5 to 60% by weight, more preferably 3 to 40% by weight based on the total amount of the photopolymerization initiator and the sensitizer.

  Furthermore, the coloring composition can contain a polyfunctional thiol that functions as a chain transfer agent. The polyfunctional thiol may be a compound having two or more thiol groups, for example, hexanedithiol, dicanedithiol, 1,4-butanediol bisthiopropionate, 1,4-butanediol bisthioglycolate, Ethylene glycol bisthioglycolate, ethylene glycol bisthiopropionate, trimethylolpropane tristhioglycolate, trimethylolpropane tristhiobropionate, trimethylolpropane tris (3-mercaptobutyrate), pentaerythritol tetrakisthioglycolate , Pentaerythritol tetrakisthiopropionate, trimercaptopropionic acid tris (2-hydroxyethyl) isocyanurate, 1,4-dimethylmercaptobenzene, 2,4,6-trimercap -s- triazine, 2 (N, N- dibutylamino) -4,6-dimercapto -s- triazine.

  These polyfunctional thiols can be used alone or in combination. The amount of the polyfunctional thiol used is preferably 0.1 to 30% by mass, more preferably 1 to 20% by mass, based on the total solid content of the colored composition. If it is less than 0.1% by mass, the effect of adding a polyfunctional thiol is insufficient, and if it exceeds 30% by mass, the sensitivity is too high and the resolution is lowered.

(solvent)
The coloring composition can contain an organic solvent as necessary in order to enable uniform coating on the substrate. The solvent also has a function of uniformly dispersing the pigment. Suitable organic solvents used include, for example, cyclohexanone, ethyl cellosolve acetate, butyl cellosolve acetate, methoxy-2-propyl acetate, diethylene glycol dimethyl ether, propylene glycol monomethyl ether acetate, ethylbenzene, ethylene glycol diethyl ether, xylene, ethyl cellosolve, methyl-n. Examples include amyl ketone, propylene glycol monomethyl ether toluene, methyl ethyl ketone, ethyl acetate, methanol, ethanol, isopropyl alcohol, butanol, isobutyl ketone, and petroleum solvents, and these are used alone or in combination.

  EXAMPLES Hereinafter, an Example is shown and this invention is demonstrated more concretely.

Example 1 Preparation of Colored Composition Red, green, and colored layer colored compositions were prepared as follows.

Red coloring composition Red pigment: C.I. I. Pigment Red 254 (“Ilgar For Red B-CF” manufactured by Ciba Specialty Chemicals) 38 parts Red pigment: C.I. I. Pigment Red 177 (“Chromophthal Red A2B” manufactured by Ciba Specialty Chemicals) 78 parts Dispersant (“Ajisper PB821” manufactured by Ajinomoto Fine Techno Co., Ltd.) 15 parts Acrylic varnish (solid content 20%) 60 parts Uniform mixture of the above composition The mixture was stirred and mixed, and then dispersed with a sand mill for 5 hours using a glass piece having a diameter of 1 mm, and then filtered with a 5 μm filter to prepare a red pigment dispersion.

298 parts dipentaerythritol hexaacrylate ("M402" manufactured by Toa Gosei Co., Ltd.) 15 parts Acrylic varnish (solid content 20%) 136 parts Photoinitiator ("TRG278" manufactured by Toyo Ink Manufacturing Co., Ltd.) 7 parts 292 parts of cyclohexanone Subsequently, the mixture having the above composition was stirred and mixed so as to be uniform, and then filtered through a 5 μm filter to obtain a red colored composition.

Green coloring composition Green pigment: C.I. I. Pigment Green 36 140 parts Yellow pigment: C.I. I. Pigment Yellow 150 85 parts Acrylic varnish (solid content 20%) 225 parts After uniformly stirring and mixing the mixture of the above composition, using a glass piece having a diameter of 1 mm, it is dispersed in a sand mill for 5 hours, and then filtered through a 5 μm filter and green. A pigment dispersion was prepared.

450 parts of the above-mentioned green pigment dispersion Dipentaerythritol hexaacrylate (“M402” manufactured by Toagosei Co., Ltd.) 30 parts Photoinitiator (“Irgacure 369” manufactured by Ciba Geigy) 6 parts Sensitizer (Hodogaya Chemical Co., Ltd.) “EAB-F” 1 part Cyclohexanone 230 parts Thereafter, the mixture having the above composition was stirred and mixed so as to be uniform, and then filtered through a 5 μm filter to obtain a green colored composition.

Blue coloring composition Blue pigment: C.I. I. 50 parts of PigmentBlue 15 (“Rionol Bull-ES” manufactured by Toyo Ink Manufacturing Co., Ltd.)
Purple pigment: C.I. I. PigmentViolet 23 2 parts (BASF "Paliogen Violet 5890")
Dispersant (“Solspers 2000” manufactured by Zeneca) 6 parts Acrylic varnish (solid content 20%) 200 parts The mixture having the above composition was uniformly stirred and mixed, and then dispersed in a sand mill for 5 hours using a glass piece having a diameter of 1 mm. Thereafter, the mixture was filtered through a 5 μm filter to prepare a blue pigment dispersion.

121 parts of the above dispersion 19 parts of trimethylolpropane triacrylate (“NK ester ATMPT” manufactured by Shin-Nakamura Chemical Co., Ltd.)
Photoinitiator ("Irgacure 907" manufactured by Ciba-Geigy Co., Ltd.) 4 parts Sensitizer ("EAB-F" manufactured by Hodogaya Chemical Co., Ltd.) 2 parts Cyclohexanone 214 parts Thereafter, the mixture having the above composition was stirred to be uniform. After mixing, the mixture was filtered through a 5 μm filter to obtain a blue colored composition.

Preparation of color filter A color filter was prepared by the following steps using the photosensitive resin composition.

  First, a red coloring composition was applied to a glass substrate provided with a stripe-shaped black matrix having a width of 20 μm and a thickness of 2.0 μm by spin coating so as to have a thickness of 2.0 μm.

  After drying this, striped pattern exposure was performed with an exposure machine, and development was performed with an alkaline developer for 90 seconds to obtain a colored layer of striped red pixels.

Sodium carbonate 1.5% by weight
Sodium bicarbonate 0.5% by weight
Anionic surfactant 8.0% by weight ("Perireckes NBL" manufactured by Kao Corporation)
90% water.

  The alkaline developer has the above composition.

  Next, the green coloring composition is similarly applied by spin coating so that the film thickness becomes 2.0 μm, dried, and then the striped colored layer is applied to the adjacent edge of the red pixel coloring layer by an exposure machine. A green pixel colored layer adjacent to the red pixel colored layer was obtained by exposing and developing at a position overlapping with the portion at a predetermined width.

  Further, in the same manner as for red and green, a blue colored composition was obtained with a thickness of 2.0 μm and a colored layer of a colored pixel adjacent to the colored layer of the red and green pixels.

  1, the black matrix and the colored layer are in contact with each other or overlapped with each other, and the relationship of the film thickness is | colored layer film thickness−black matrix film thickness | A color filter satisfying ≦ 0.1 μm was obtained.

Note that the rising height of the boundary region and the angle of the color layer end portion forming the boundary region surface with respect to the transparent substrate are images obtained by enlarging the boundary region surface end portion by 100,000 times with a Hitachi electron microscope S4000. Was measured using a length measuring instrument or a protractor.

  The raised height of the boundary region of the obtained color filter and the angle of the color layer end surface forming the boundary region surface with respect to the transparent substrate are shown in Table 1 below.

  Table 1 below shows the overlapping width between the adjacent colored layer and the black matrix.

  The overlapping width between the colored layers was measured by measuring the width of the overlapping portion of the image projected using a reflection light source with an Olympus microscope.

  In addition, an alignment film material (Nissan Chemical's Sunever 7492) is applied on the colored layer of the obtained color filter so that the film thickness after baking becomes 70 nm, and baking is performed at 220 ° C. for 30 minutes. A color filter substrate having an alignment film thereon was prepared.

  The color filter substrate after applying and baking these alignment films is rubbed twice with a rubbing device under the conditions of a push amount of 0.3 mm, a roll rotation speed of 1800 rpm, and a stage moving speed of 22.5 mm / s. The alignment film surface state after rubbing was observed, and the alignment film peeling was evaluated.

  A case where no peeling of the alignment film was observed was evaluated as ◯, a case where the alignment film was slightly generated was evaluated as x, and a case where the alignment film was remarkably generated was evaluated as xx.

  The results are shown in Table 2 below.

Example 2
The surface of the color filter obtained in the same manner as in Example 1 is subjected to surface polishing using the same polishing machine as in FIG. 3, and the raised height of the boundary region of the obtained color filter and the colored layer surface forming the boundary region surface The color filter which changed the angle with respect to the transparent substrate of the edge part was created.

  In the same manner as in Example 1, the angle and the overlapping width of the surface portion of the extended portion constituting the boundary region surface of the obtained color filter with respect to the black matrix surface were measured and evaluated. The results are shown in Table 1 below.

  Further, in the same manner as in Example 1, the alignment film peeling was evaluated. The results are shown in Table 2 below.

Example 3
A color filter having an overlap width of 9 μm was obtained in the same manner as in Example 2 except that the pattern line width was changed.

  In the same manner as in Example 1, the rising height of the boundary region of the obtained color filter, the angle of the color layer surface end portion forming the boundary region surface with respect to the transparent substrate surface, and the overlapping width were measured and evaluated. The results are shown in Table 1 below.

  Further, in the same manner as in Example 1, the alignment film peeling was evaluated. The results are shown in Table 2 below.

Comparative Example 1
A color filter having the same configuration as in Example 1 and a red pixel film thickness of 1.7 μm was manufactured.

  In the same manner as in Example 1, the rising height of the boundary region of the obtained color filter and the angle and overlapping width with respect to the transparent substrate at the color layer surface end portion forming the boundary region surface were measured and evaluated. The results are shown in Table 1 below.

  Further, in the same manner as in Example 1, the alignment film peeling was evaluated. The results are shown in Table 2 below.

Comparative Example 2
With the same configuration as in Comparative Example 1, surface polishing was performed, and a color filter was manufactured in which the rising height of the boundary region and the angle of the color layer surface end portion forming the boundary region surface with respect to the transparent substrate were changed.

  In the same manner as in Example 1, the rising height of the boundary region of the obtained color filter and the angle and overlapping width of the color layer surface end portion forming the boundary region surface with respect to the transparent substrate were measured and evaluated. The results are shown in Table 1 below.

  Further, in the same manner as in Example 1, the alignment film peeling was evaluated. The results are shown in Table 2 below.

  In Comparative Examples 1 and 2, by observing the surface state after rubbing, it can be confirmed that a large amount of peeling occurs in the alignment film, particularly at the end of the colored layer, and particularly the film thickness of the red pixel and the film thickness of the black matrix. In Comparative Example 1 where the difference between the two was large and the rising height of the boundary region was relatively high, peeling was significant.

  On the other hand, in any of the color filters of Examples 1 to 3, peeling of the alignment film due to rubbing was not observed at all.

Typical sectional drawing showing composition of an example of a color filter concerning the present invention. Schematic cross-sectional view enlarging FIG. Schematic showing an example of a polishing machine that can be used in the present invention The figure showing the modification of the color filter shown in FIG. Sectional drawing showing the structure of an example of the preferable liquid crystal display device of this invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,8 ... Transparent substrate, 2 ... Black matrix, 3, 3R, 3G, 3B ... Colored layer, 4, 22 ... Orientation film, 6, 9 ... Polarizing plate, 10 ... Color filter, 11 ... Table, 12 ... Surface plate , 13 ... Polishing pad, 14 ... Flexible layer, 15 ... Hard film layer, 16 ... Common electrode, 17 ... Insulating layer, 18 ... Pixel electrode, 19 ... Liquid crystal, 40 ... Color filter substrate, 50 ... Counter substrate, 60 ... Liquid crystal Display device

Claims (7)

A transparent substrate; a black matrix having an opening provided on the transparent substrate; and a plurality of colored layers forming color pixels provided in the opening; the black matrix and the colored layer A color filter, wherein the end portions are in contact with each other or stacked, and the film thickness relationship is | colored layer film thickness-black matrix film thickness | ≦ 0.1 μm. 2. The color filter according to claim 1, wherein a rising height of a portion where the colored layer and the black matrix contact or overlap each other is 0.3 μm or less from the black matrix or the colored layer. 3. The color filter according to claim 2, wherein an end surface of a portion where the colored layer and the black matrix are in contact with or stacked on each other has an angle of 2 to 45 [deg.] With respect to the transparent substrate. 4. The color filter according to claim 3, wherein an overlapping width of a portion where the colored layer and the black matrix are in contact with each other or overlapped with each other is 10 [mu] m or less. 5. The color filter according to claim 1, wherein the projection portion where the colored layer and the black matrix are in contact with each other or stacked is flattened by mechanical polishing. 6. The color filter according to claim 1, wherein the color filter is used in a horizontal electric field type liquid crystal display device without providing a protective layer made of a transparent resin. A liquid crystal display device comprising the color filter according to claim 6.

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