JP2006079012A - Blue color filter and liquid crystal display using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blue color filter capable of attaining high color reproducibility and high contrast. <P>SOLUTION: Regarding the blue color filter constituted of a color filter formed by dispersing at least blue pigment in binder resin, and a spectroscopic characteristics adjusting filter arranged in parallel to the color filter, formed by dispersing non-pigment coloring matter, whose maximum absorption wavelength extent in a visible wavelength region is 455nm to 540nm, and having a half width of ≤50nm, in a binder resin, a ratio of the blue pigment to the whole pigment as coloring material contained in the color filter is at least ≥90%. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a blue color filter that realizes high color reproducibility and contrast, and a liquid crystal display device using the blue color filter.

  Color liquid crystal display devices (color LCDs) are widely used against the background of lower prices and larger liquid crystal display panels. In recent years, display image quality has become a major factor in product differentiation. There are various indexes of image quality, but it is desired that the contrast is high and the color reproduction range is high.

  A liquid crystal display device is a light source (a liquid crystal cell layer sandwiched between two polarizing films) that passes through the first polarizing film by adjusting the voltage applied to the electrodes provided between the layers for each pixel. This is a device that performs display by controlling the degree of polarization of light from a backlight unit or the like and controlling the amount of light passing through the second polarizing film.

When performing color display with a liquid crystal display device, a color filter that is an aggregate of fine red, blue, and green regions is usually provided between the liquid crystal cell layer and the second polarizing film, and the blue, red, green One pixel is displayed using at least one region.
Therefore, the emission spectrum of the light source and the spectral characteristics of the color filter are major factors that determine the color purity and color reproduction range of the liquid crystal display device.
At present, image quality is improved mainly by improving the spectral characteristics of the color filter.

  As a method for producing a color filter, methods such as a dyeing method, a pigment dispersion method, an electrodeposition method, and a printing method are known, but the pigment dispersion method is mainly used at present from the viewpoint of durability. However, since the pigment is a crystal particle of about 10 to 1000 nm, the reflection (that is, scattering) on the surface causes a change in the polarization direction that is considered to be caused by the birefringence of the crystal particle, resulting in light scattering. In order to deteriorate the polarization characteristics (the degree of alignment of the vibration direction of light), the contrast is lowered such that light that should be blocked by the second polarizing film leaks. In addition, the particles are essentially inferior in transparency (transmittance) compared to dyes that exhibit color only by molecular absorption. Since the scattering of light by the pigment increases as the wavelength becomes shorter, this problem is most noticeable in the blue pixel region of the color filter, which causes not only a decrease in contrast but also a change in color tone. Any of these problems is a phenomenon caused by scattering from the pigment. In general, the smaller the particle diameter, the better the characteristics. However, the difficulty of atomization differs depending on the pigment type. In particular, dioxazine violet, which is a purple pigment used for blue pixels, is difficult to atomize, which is a cause of hindering high contrast.

JP 2004-133208 A

  In order to improve transparency in a color filter using pigments, it has been found that pigment atomization is effective, and various pigment atomization methods and dispersion methods of atomized pigments have been proposed. However, there is a problem that the smaller the particle size, the more the pigment surface area increases, the coating solution becomes unstable, and the control of coating properties becomes difficult. In addition, since pigments are inherently microcrystalline, excessive atomization leads to collapse of the crystal system and changes the color tone. For these reasons, there was a natural limit to atomization.

  Since it is necessary to use a lot of pigments to reproduce colors with high density, when using the same color material, the color reproduction range (reproduction ability from light to dark colors) and brightness (high transmittance) Is in a trade-off relationship. Accordingly, there is a strong demand for a technique for improving the brightness while maintaining the color reproduction range (or expanding the color reproduction range while maintaining the brightness).

  Further, as a light source of a liquid crystal display device, a white surface light source using a cold cathode tube having a light emission wavelength in a red (R), green (G), or blue (B) wavelength region as a light source is generally used. Among the light emitters of cold-cathode tubes, Y2O 3: Eu phosphor as red emitter, LaPO4: Ce, Tb phosphor as green emitter, BaMgAl10O 17: Eu phosphor as blue emitter, Sr10 (PO4) 6Cl2: Eu-based phosphor is generally used. A three-wavelength emission type fluorescent tube in which an electrode is mounted in an envelope provided with a phosphor film in which these phosphors are mixed at an appropriate mixing ratio in consideration of white balance and a rare gas is enclosed is often used as a light source. Yes. In addition, there is a substrate using a phosphor layer and a cathode tube or LED that emits ultraviolet light, blue light, or deep blue light, and the phosphor is excited by light from these to be used as a white surface light source. There is also a method of combining three color LEDs that emit light in the red, green, and blue wavelength regions. However, these phosphors have weak emission peaks in wavelength regions other than R, G, and B as sub-emission peaks, so that the color purity is deteriorated.

  Since deterioration in color purity hinders the expansion of the color reproduction range of the liquid crystal display element, it is conceivable to add a dye having a characteristic of absorbing a wavelength region corresponding to the sub-emission peak to the color filter. However, the absorption peak of the existing dye always has a finite width, and is usually about 60 nm in half width. Since the sub-emission peak has a wavelength close to the main emission peak, even if there is a dye having the maximum absorption wavelength λmax in the sub-emission peak wavelength, the base of the absorption spectrum is affected by the main emission peak wavelength, and only the sub-emission part is It is impossible to lose. For this reason, if the amount of the dye is increased in order to reduce the light at the sub-emission peak as much as possible, the overall image becomes dark and has a low contrast.

  In particular, the absorption spectrum of Pigment Green (P.G.) 36, Pigment Blue (P.B.) 15: 6, which is commonly used to form the green and blue regions of the color filter, is broad. This problem is remarkable. In addition, the pigment concentration in each pixel region of the color filter is increased, so that the performance as a photolithography material is deteriorated (for example, the development time is increased, the pattern shape is difficult to control, the yield is decreased, etc.). was there.

  A technique for cutting only the sub-emission peak wavelength of a phosphor using an optical diffraction grating without using a dye has also been proposed, but there is a problem in terms of cost because it is necessary to stack layers having different refractive indexes. .

In view of such prior art, the applicant first uses a light control film that further adjusts the transmitted light spectrum from the color filter, and obtains a desired emission spectrum by combining the color filter and the light control film. (Patent Document 1).
An object of the present invention is to provide a color filter for realizing a color liquid crystal display device with good color reproducibility and high contrast based on the idea of Patent Document 1.

As a result of intensive studies to solve the above problems, the present inventors have paid attention to a specific pigment component used in current color filters, and used a pigment other than the pigment for spectral characteristics of the pigment component. It is possible to achieve high color reproduction and high contrast at the same time by removing or drastically reducing this specific pigment component from the color filter by realizing with another optical system element formed by, for example, another filter. And the present invention has been reached.
The specific pigment component referred to here is a pigment (typically a violet (purple) pigment added to remove blue-green light emission, among other pigment components used to form a blue color filter). ).

  Light scattering by the pigment increases as the wavelength of the light is shorter. Therefore, of the emission peaks of the three-wavelength emission type fluorescent tube, blue emission is most susceptible to scattering by the pigment. Therefore, among the pigments for realizing the blue, green, and red pixel areas constituting the color filter, the pigment for the blue pixel area (blue color filter) (that is, to absorb components other than the blue emission peak). Is most effective for increasing the transmittance of the color filter and thus the contrast of the color liquid crystal display device.

  Currently, in order to make the spectral characteristics (absorption spectrum) steep in each color pixel region of the color filter, a plurality of pigments having different spectral characteristics are generally used. For example, blue and purple pigments are in the blue pixel region, green and yellow pigments are in the green region, and red, orange and yellow pigments are in the red pixel region.

  Among the plural types of pigments added to the blue, green, and red pixel areas, a pigment that determines basic color characteristics (blue pigment in the blue pixel area, green pigment in the green pixel area, red pixel In the region, it is not desirable to reduce the red pigment) because the range of reproducible colors is narrowed. However, for other pigments added to improve the spectral characteristics of the basic color pigment, such as removing the secondary emission peak of the three-wavelength fluorescent tube, the characteristics of the pigment can only be realized by other means. In theory, it can be removed.

  Therefore, in the present invention, the spectral characteristics that have been or have been achieved by the violet pigment used in the conventional blue color filter are realized by using a filter using a dye pigment (spectral characteristic adjustment filter). By combining the blue color filter with this spectral characteristic adjustment filter, it achieves the same spectral characteristics as a conventional blue color filter, resulting in a blue color filter with a small amount of pigment added and sharp spectral characteristics. To get.

  In addition, since the spectral characteristic adjusting filter can be manufactured without experiencing the severe high temperature that the pigment experiences in the manufacturing process of the color filter, it is possible to use a dye. Dye pigments have a steeper spectrum than pigment pigments, resulting in greater improvements than the spectral characteristics of purple pigments, resulting in higher contrast emission with higher color purity than conventional blue color filters. A possible blue color filter is obtained.

  That is, the gist of the present invention is a color filter in which at least a blue pigment is dispersed in a binder resin, and is arranged in parallel with the color filter, and the maximum absorption wavelength range in the visible wavelength region is 455 nm to 540 nm and the half-value width is 50 nm or less. A blue color filter composed of a spectral characteristic adjusting filter in which a non-pigment dye is dispersed in a binder resin, and the ratio of the blue pigment to the entire pigment as a color forming material contained in the color filter is at least 90% or more It exists in the blue color filter characterized by being.

  Further, another gist of the present invention includes a surface light source device, a liquid crystal display panel, a spectral characteristic adjustment filter according to the present invention disposed on an output light path of the surface light source device, a red pixel, a green pixel, and a blue pixel. The present invention resides in a liquid crystal display device using a color filter constituting a blue color filter according to the present invention as a blue pixel.

  With such a configuration, the blue color filter according to the present invention has high color purity and can realize high contrast. Therefore, the blue color filter according to the present invention can be particularly suitably used as a blue pixel of a color filter used in a liquid crystal display device or an imaging device.

Hereinafter, the present invention will be described in detail based on preferred embodiments thereof.
First, an outline of the present invention will be described.
As described above, the blue color filter according to the present invention has a spectral characteristic constituted by using a color filter constituted by using a pigment and a dye (dye) dispersed monomolecularly in a resin other than the pigment. The color reproducibility required as a blue color filter is realized by a combination with an adjustment filter. Therefore, when one of the filters does not exist, the blue color purity is not high.

  The color filter constituting the blue color filter according to the present invention most preferably contains only a blue pigment as a pigment as a color forming material, but does not completely exclude the mixture of other pigments. Specifically, pigments other than blue may be included with the upper limit of 10%, preferably 5%, based on the total amount of pigment as the color forming material.

  The spectral characteristic adjusting filter constituting the blue color filter according to the present invention is a non-pigment that is arranged in parallel with the color filter and has an absorption peak in the range of 380 nm to 780 nm of visible light of 455 nm to 540 nm and a half width of 50 nm or less. The dye is dispersed in the binder resin, and the transmittance at the absorption peak is preferably 75% or less, more preferably 50% or less, and more preferably 30% or less. Further, the absorption characteristic of the spectral characteristic adjusting filter according to the present invention is not a pigment but a non-pigment pigment (dye) dispersed in a monomolecular manner in the resin. This absorption also absorbs the blue-green sub-emission peak (490 nm) existing between the blue emission peak (450 nm) and the green emission peak (545 nm) of the three-wavelength fluorescent tube.

Further, in the state in which the blue color filter according to the present invention is configured by combining the spectral characteristic adjustment filter and the color filter, the chromaticity of the transmitted light measured using the CIE standard C light source as the light source is CIE XYZ color system, X, y (x = X / (X + Y + Z), y = Y / (X + Y + Z)) are both 0.13 ≦ x ≦ 0.16, 0.05 ≦ y ≦ 0.13, preferably 0.8. 135 ≦ x ≦ 0.155, 0.06 ≦ y ≦ 0.12, more preferably 0.135 ≦ x ≦ 0.150 and 0.08 ≦ y ≦ 0.12.
Note that the positional relationship between the color filter and the spectral characteristic adjusting filter is not particularly limited as long as the color filter and the spectral characteristic adjusting filter are arranged in parallel so that both are present in the optical path.

The present invention will be described in further detail below.
(Spectral characteristic adjustment filter)
The spectral characteristic adjusting filter according to the present invention can be prepared by various methods, and the following modes are conceivable to illustrate some of them.
(1) A pigment is dissolved in a binder resin to form a film or sheet.
(2) A coating solution in which a pigment is dissolved in a binder resin is coated on the upper surface or the lower surface of a base film or sheet.
(3) Display device using the blue color filter according to the present invention, for example, an optical system component generally used in a liquid crystal display device, a light guide for a surface light source device, a light diffusion sheet, a polarizing film, an antireflection film, and a viewing angle expansion. By mixing a pigment when producing a film or the like, these constituent elements themselves have the function of a spectral characteristic adjusting filter.
(4) A dye is dissolved in an adhesive used for attaching a color filter to a display device using a blue color filter according to the present invention, or an adhesive used between optical system components described in (3), and an adhesive. The layer has a function as a spectral characteristic adjusting filter.

  As the binder resin in (1) or (2), any dye can be used as long as it has high transparency and a dye having a desired absorption spectrum can stably exist in a molecular form in the resin, that is, has high compatibility with the dye. Can be used. Examples thereof include acrylic resins, polycarbonate resins, polyester resins, polyvinyl alcohol resins, polyolefin resins, polyimide resins, melamine resins, silicate resins, and the like.

  As a method for forming a layer containing a dye, the above resin and the dye are dissolved in a common solvent, and then applied and dried. The monomer and the dye that are the precursors of the resin are applied and cured by heat or light. Methods and the like.

  In the case of (3), the film itself is colored to a desired color by kneading with a pigment before forming a polarizing film, a light diffusion sheet, a viewing angle widening film, an antireflection film, a retardation film, etc. into a film shape. Can be obtained by the method. In the case of a light guide plate, it can be obtained by kneading with a pigment before processing into a plate shape by injection molding or the like. In the case of a light diffusing sheet, since a coating layer made of a photocurable resin in which almost transparent beads are dispersed is formed on a base film (such as a PET film), a pigment is mixed in advance with this coating solution, The coating layer may be colored, or the substrate film itself may be colored.

  Here, as a base film used in (1) to (3), while having high transparency, it retains moderate rigidity and generates heat generated from a light source, that is, a discharge tube such as a cold cathode tube. A material that does not bend when received is suitable. Specifically, a film made of polyethylene terephthalate, polyethylene naphthalate, polypropylene, polycarbonate, polyarylate, norbornene-based cyclic polyolefin, polymethyl methacrylate, etc., having a thickness of 30 μm to 350 μm, preferably 40 μm to 300 μm, more preferably 50 μm to 250 μm. Among them, a biaxially stretched polyethylene terephthalate film or a biaxially stretched polypropylene film is most suitable because it has high rigidity and is firm, and is less susceptible to heat deflection.

  The pressure-sensitive adhesive or pressure-sensitive adhesive layer used in (4) is not particularly limited as long as it does not adversely affect the required optical characteristics. For example, as described in JP-A-2004-170907 Examples thereof include those obtained by blending an acrylic polymer and a silane coupling agent with an acrylic polymer, and those obtained by adding a photopolymerization initiator to an acrylic polymer and irradiating with ultraviolet rays (UV).

  As a non-pigment dye having an absorption peak in the range of 380 nm to 780 nm in the visible light range of 455 nm to 540 nm and a half value width of 50 nm or less, which is used in the filter for adjusting spectral characteristics of the present invention, it has excellent controllability of the absorption wavelength in the visible light range. In addition, a dye compound having a sharp absorption peak with a narrow half width of the absorption spectrum is suitable, and an appropriate optical design is made in relation to a pigment-dispersed color filter described later, and high color reproducibility. A liquid crystal display element excellent in brightness balance can be obtained. Specific examples of the dye used for the spectral characteristic adjustment filter include pyrazole squarylium compounds, porphyrin compounds, dipyrromethene metal chelate compounds, and pyromethene compounds.

  Specifically, among non-pigment dyes having an absorption peak in the range of 380 nm to 780 nm in the visible light range of 455 nm to 540 nm and a half width of 50 nm or less, the pyrazole-based squarylium compound is represented by the general formula (I) shown in [Chemical Formula 1]. These compounds are given as representative examples.

[In Formula (I), Y ₁ represents a hydrogen atom, an alkyl group which may have a substituent, or an aryl group which may have a substituent, and each Y ₁ may be the same. May be different. Y ₂ has a hydrogen atom, an alkyl group which may have a substituent, an amino group which may have a substituent, an alkoxycarbonyl group which may have a substituent, or a substituent. Each Y ₂ may be the same or different. X represents an -O- or -NH- group. ]

  More specifically, compounds represented by the general formulas (I-1) to (I-8) represented by [Chemical Formula 2] are given as representative examples.

  Here, these squarylium compounds are disclosed in, for example, Angew. Chem. 77 680-681 (1965), or according thereto. These tetraazaporphyrin-based dyes are disclosed in J. Org. Gen. Chem. USSR vol. 47, 1954-1958 (1977).

  Among the non-pigment dyes having an absorption peak in the range of 380 nm to 780 nm of visible light of 455 nm to 540 nm and a half width of 50 nm or less, examples of the porphyrin compound include a porphyrin compound represented by the following general formula (II).

[Wherein, X _{1 to} X ₈ are each independently a hydrogen atom, a halogen atom, an alkoxy group, an alkylthio group, a substituted or unsubstituted phenoxy group, a substituted or unsubstituted naphthoxy group, a substituted or unsubstituted phenylthio group, or Represents a substituted or unsubstituted naphthylthio group, R represents a substituted or unsubstituted phenyl group, M represents two hydrogen atoms, or a divalent metal, trivalent, or tetravalent metal derivative; ]
Specific examples of the porphyrin compound represented by the general formula (II) used in the present invention are described below. Examples of the halogen atom in X _{1 to} X ₈ include fluorine, chlorine, bromine and iodine. The alkoxy group and thioalkyl group are not particularly limited, but the alkyl group in the substituent is preferably a linear, branched or cyclic alkyl group having 1 to 12 carbon atoms, and having 1 to 8 carbon atoms. A linear, branched or cyclic alkyl group is particularly preferred.

  Specific examples of the alkyl group in the alkoxy group and thioalkyl group include methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group, iso-butyl group, sec-butyl group, t-butyl group. Group, n-pentyl group, iso-pentyl group, 2-methylbutyl group, 1-methylbutyl group, neo-pentyl group, 1,2-dimethylpropyl group, 1,1-dimethylpropyl group, cyclopentyl group, n-hexyl group 4-methylpentyl group, 3-methylpentyl group, 2-methylpentyl group, 1-methylpentyl group, 3,3-dimethylbutyl group, 2,3-dimethylbutyl group, 1,3-dimethylbutyl group, 2 , 2-dimethylbutyl group, 1,2-dimethylbutyl group, 1,1-dimethylbutyl group, 3-ethylbutyl group, 2-ethylbutyl group, 1-ethyl Tyl group, 1,2,2-trimethylbutyl group, 1,1,2-trimethylbutyl group, 1-ethyl-2-methylpropyl group, cyclohexyl group, n-heptyl group, 2-methylhexyl group, 3-methyl Hexyl group, 4-methylhexyl group, 5-methylhexyl group, 2,4-dimethylpentyl group, n-octyl group, 2-ethylhexyl group, 2,5-dimethylhexyl group, 2,5,5-trimethylpentyl group 2,4-dimethylhexyl group, 2,2,4-trimethylpentyl group, n-octyl group, 3,5,5-trimethylhexyl group, n-nonyl group, n-decyl group, 4-ethyloctyl group, 4-ethyl-4,5-dimethylhexyl group, n-undecyl group, n-dodecyl group, 1,3,5,7-tetraethyloctyl group, 4-butyloctyl group, 6,6-di- Tyloctyl group, n-tridecyl group, 6-methyl-4-butyloctyl group, n-tetradecyl group, n-pentadecyl group, 3,5-dimethylheptyl group, 2,6-dimethylheptyl group, 2,4-dimethylheptyl Group, 2,2,5,5-tetramethylhexyl group, 1-cyclopentyl-2,2-dimethylpropyl group, 1-cyclohexyl-2,2-dimethylpropyl group and the like.

  Specific examples of the substituted or unsubstituted phenoxy group include phenoxy group, 2-methylphenoxy group, 3-methylphenoxy group, 4-methylphenoxy group, 2-ethylphenoxy group, 3-ethylphenoxy group, 4-ethyl. Examples include phenoxy group, 2,4-dimethylphenoxy group, 3,4-dimethylphenoxy group, 4-t-butylphenoxy group, 4-aminophenoxy group, 4-dimethylaminophenoxy group, 4-diethylaminophenoxy group and the like.

  Specific examples of the substituted or unsubstituted naphthoxy group include 1-naphthoxy group, 2-naphthoxy group, nitronaphthoxy group, cyanonaphthoxy group, hydroxynaphthoxy group, methylnaphthoxy group, trifluoromethylnaphthoxy group and the like. .

  Specific examples of the substituted or unsubstituted phenylthio group include a phenylthio group, a 2-methylphenylthio group, a 3-methylphenylthio group, a 4-methylphenylthio group, a 2-ethylphenylthio group, and a 3-ethylphenylthio group. Group, 4-ethylphenylthio group, 2,4-dimethylphenylthio group, 3,4-dimethylphenylthio group, 4-t-butylphenylthio group, 4-aminophenylthio group, 4-dimethylaminophenylthio group , 4-diethylaminophenylthio group and the like.

  Specific examples of the substituted or unsubstituted naphthylthio group include 1-naphthylthio group, 2-naphthylthio group, nitronaphthylthio group, cyanonaphthylthio group, hydroxynaphthylthio group, methylnaphthylthio group, trifluoromethylnaphthylthio group. Etc.

  R is a substituted or unsubstituted phenyl group, and specific examples thereof include phenyl group, 2-methylphenyl group, 3-methylphenyl group, 4-methylphenyl group, 2-ethylphenyl group, 3-ethyl. Phenyl group, 4-ethylphenyl group, 2,4-dimethylphenyl group, 3,4-dimethylphenyl group, 4-t-butylphenyl group, 4-aminophenyl group, 4-dimethylaminophenyl group, 4-diethylaminophenyl Groups and the like.

M represents two hydrogen atoms, or a divalent metal, trivalent, or tetravalent metal derivative, and as M is a divalent metal, Cu (II), Zn (II), Fe (II), Co (II), Ni (II), Ru (II), Rh (II), Pd (II), Pt (II), Mn (II), Mg (II), Ti (II), Be (II), Ca (II), Ba (II), Cd (II), Hg (II), Pb (II), Sn (II), trivalent or tetravalent metal derivatives include AlCl, InCl, FeCl , MnCl, SiCl ₂ , GeCl ₂ , TiO, Vo and the like.
Representative examples of the general formula (II) are shown in the following tables (Tables 1 to 8), but are not limited thereto.

  Among non-pigment dyes having an absorption peak in the range of 380 nm to 780 nm in the visible light range of 455 nm to 540 nm and a half width of 50 nm or less, particularly preferred compounds as the dipyrromethene metal chelate compound are represented by the following general formula (III) (Chemical Formula 4) The dipyrromethene metal chelate compound represented is mentioned.

[Wherein R _{1 to} R ₇ are each independently a hydrogen atom, a halogen atom, a nitro group, a cyano group, a hydroxyl group, an amino group, a carboxyl group, a sulfonic acid group, an alkyl group having 20 or less carbon atoms, an alkoxyalkyl group, Alkoxy group, alkoxyalkoxy group, aryloxy group, acyl group, alkoxycarbonyl group, alkylaminocarbonyl group, dialkylaminocarbonyl group, alkylcarbonylamino group, phenylcarbonylamino group, phenylaminocarbonyl group, phenoxycarbonyl group, aralkyl group, Represents an aryl group, a heteroaryl group, an alkylthio group, a phenylthio group or an alkenyl group, and M represents a divalent metal atom. ]

Specific examples of the dipyrromethene metal chelate compound represented by the general formula (III) used in the present embodiment are described below.
R _{1 to} R ₇ include a hydrogen atom; a halogen atom of fluorine, chlorine, bromine, or iodine; a nitro group; a cyano group; a hydroxyl group; an amino group; a carboxyl group; a sulfonic acid group, a methyl group, an ethyl group, an n-propyl group, iso-propyl group, n-butyl group, iso-butyl group, sec-butyl group, t-butyl group, n-pentyl group, iso-pentyl group, 2-methylbutyl group, 1-methylbutyl group, neo-pentyl group, 1,2-dimethylpropyl group, 1,1-dimethylpropyl group, cyclo-pentyl group, n-hexyl group, 4-methylpentyl group, 3-methylpentyl group, 2-methylpentyl group, 1-methylpentyl group, 3,3-dimethylbutyl group, 2,3-dimethylbutyl group, 1,3-dimethylbutyl group, 2,2-dimethylbutyl group, 1,2-dimethylbutyl group 1,1-dimethylbutyl group, 3-ethylbutyl group, 2-ethylbutyl group, 1-ethylbutyl group, 1,2,2-trimethylbutyl group, 1,1,2-trimethylbutyl group, 1-ethyl-2- Methylpropyl group, cyclo-hexyl group, n-heptyl group, 2-methylhexyl group, 3-methylhexyl group, 4-methylhexyl group, 5-methylhexyl group, 2,4-dimethylpentyl group, n-octyl group 2-ethylhexyl group, 2,5-dimethylhexyl group, 2,5,5-trimethylpentyl group, 2,4-dimethylhexyl group, 2,2,4-trimethylpentyl group, n-octyl group, 3,5 , 5-trimethylhexyl group, n-nonyl group, n-decyl group, 4-ethyloctyl group, 4-ethyl-4,5-dimethylhexyl group, n-undecyl group, n Dodecyl group, 1,3,5,7-tetraethyloctyl group, 4-butyloctyl group, 6,6-diethyloctyl group, n-tridecyl group, 6-methyl-4-butyloctyl group, n-tetradecyl group, n -Pentadecyl group, 3,5-dimethylheptyl group, 2,6-dimethylheptyl group, 2,4-dimethylheptyl group, 2,2,5,5-tetramethylhexyl group, 1-cyclo-pentyl-2,2 -Linear, branched or cyclic alkyl groups such as dimethylpropyl group, 1-cyclo-hexyl-2,2-dimethylpropyl group; methoxyethyl group, ethoxyethyl group, iso-propyloxyethyl group, 3-methoxypropyl group , Alkoxyalkyl groups such as 2-methoxybutyl group; methoxy group, ethoxy group, n-propoxy group, iso-propoxy group, n -Alkoxy groups such as butoxy, iso-butoxy, sec-butoxy, t-butoxy, n-pentoxy, iso-pentoxy, neo-pentoxy, n-hexyloxy, n-dodecyloxy; Alkoxyalkoxy groups such as methoxyethoxy group, ethoxyethoxy group, 3-methoxypropyloxy group, 3- (iso-propyloxy) propyloxy group; phenoxy group, 2-methylphenoxy group, 4-methylphenoxy group, 4-t Aryloxy groups such as butylphenoxy group, 2-methoxyphenoxy group, 4-iso-propylphenoxy group; formyl group, acetyl group, ethylcarbonyl group, n-propylcarbonyl group, iso-propylcarbonyl group, n-butylcarbonyl Group, iso-butylcarbonyl group, sec- Acyl groups such as tilcarbonyl group, t-butylcarbonyl group, n-pentylcarbonyl group, iso-pentylcarbonyl group, neo-pentylcarbonyl group, 2-methylbutylcarbonyl group, nitrobenzylcarbonyl group; methoxycarbonyl group, ethoxycarbonyl Group, alkoxycarbonyl group such as isopropyloxycarbonyl group and 2,4-dimethylbutyloxycarbonyl group; methylaminocarbonyl group, ethylaminocarbonyl group, n-propylaminocarbonyl group, n-butylaminocarbonyl group, n-hexylamino Alkylaminocarbonyl group such as carbonyl group; dimethylaminocarbonyl group, diethylaminocarbonyl group, di-n-propylaminocarbonyl group, di-n-butylaminocarbonyl group, N-methyl-N-cycl Dialkylaminocarbonyl groups such as hexylaminocarbonyl group; alkylcarbonylamino groups such as acetylamino group, ethylcarbonylamino group, butylcarbonylamino group; phenylaminocarbonyl group, 4-methylphenylaminocarbonyl group, 2-methoxyphenylaminocarbonyl Group, phenylaminocarbonyl group such as 4-n-propylphenylaminocarbonyl group; phenylcarbonylamino group such as phenylcarbonylamino group, 4-ethylphenylcarbonylamino group, 3-butylphenylcarbonylamino group; phenoxycarbonyl group, 4 -Phenoxycarbonyl group such as t-butylphenoxycarbonyl group; benzyl group, nitrobenzyl group, cyanobenzyl group, hydroxybenzyl group, methylbenzyl group, dimethylbenzyl Group, trimethylbenzyl group, dichlorobenzyl group, methoxybenzyl group, ethoxybenzyl group, trifluoromethylbenzyl group, naphthylmethyl group, nitronaphthylmethyl group, cyanonaphthylmethyl group, hydroxynaphthylmethyl group, methylnaphthylmethyl group, trifluoro Aralkyl groups such as methylnaphthylmethyl group; phenyl group, nitrophenyl group, cyanophenyl group, hydroxyphenyl group, methylphenyl group, dimethylphenyl group, trimethylphenyl group, dichlorophenyl group, methoxyphenyl group, ethoxyphenyl group, trifluoromethyl Aryls such as phenyl, N, N-dimethylaminophenyl, naphthyl, nitronaphthyl, cyanonaphthyl, hydroxynaphthyl, methylnaphthyl, trifluoromethylnaphthyl, etc. Groups; heteroaryl groups such as pyrrolyl group, thienyl group, furanyl group, oxazoyl group, isoxazoyl group, oxadiazoyl group, imidazoyl group, benzoxazoyl group, benzothiazoyl group, benzoimidazolyl group, benzofuranyl group, indoyl group; Group, ethylthio group, n-propylthio group, iso-propylthio group, n-butylthio group, iso-butylthio group, sec-butylthio group, t-butylthio group, n-pentylthio group, iso-pentylthio group, 2-methylbutylthio Group, alkylthio group such as 1-methylbutylthio group, neo-pentylthio group, 1,2-dimethylpropylthio group, 1,1-dimethylpropylthio group; phenylthio group, 4-methylphenylthio group, 2-methoxyphenyl Thio group, 4-t-butyl Phenylthio group such as nylthio group; vinyl group, propenyl group, 1-butenyl group, iso-butenyl group, 1-pentenyl group, 2-pentenyl group, 2-methyl-1-butenyl group, 3-methyl-1-butenyl group 2-methyl-2-butenyl group, 2,2-dicyanovinyl group, 2-cyano-2-methylcarboxyl vinyl group, 2-cyano-2-methylsulfonvinyl group and the like.

  Examples of the divalent metal represented by M include Cu (II), Zn (II), Fe (II), Co (II), Ni (II), Ru (II), Rh (II), Pd (II), Pt (II), Mn (II), Mg (II), Ti (II), Be (II), Ca (II), Ba (II), Cd (II), Hg (II), Pb (II), Sn (II), etc. are mentioned.

  Representative examples of general formula (III) are shown in the following tables (Tables 9 to 10).

In addition, examples of the pyromethene compound include compounds represented by the following formula (IV).

[Wherein, R ^{1 to} R ⁷ are each independently a hydrogen atom, a halogen atom, a nitro group, a cyano group, a hydroxy group, an amino group, a carboxyl group, a sulfonic acid group, an alkyl group having 1 to 20 carbon atoms, or 1 carbon atom. -20 halogenoalkyl group, C1-C20 alkoxy group, C2-C20 alkenyl group, C2-C20 alkoxyalkyl group, C2-C20 alkoxyalkoxy group, C6-C20 Aryloxy group, C1-C20 acyl group, C2-C20 alkoxycarbonyl group, C2-C20 alkylaminocarbonyl group, C3-C20 dialkylaminocarbonyl group, C2-C2 20 alkylcarbonylamino groups, 7-20 carbon atoms phenylcarbonylamino group, 7-20 carbon atoms phenylaminocarbonyl group, 7-20 carbon atoms A phenoxycarbonyl group, an aralkyl group having 7 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a heteroaryl group having 4 to 20 carbon atoms, an alkylthio group having 1 to 20 carbon atoms, a phenylthio group having 6 to 20 carbon atoms, C3-C20 alkenyloxycarbonyl group, C8-C20 aralkyloxycarbonyl group, C4-C20 alkoxycarbonylalkoxycarbonyl group, C4-C20 alkylcarbonylalkoxycarbonyl group, C2-C2 20 mono (hydroxyalkyl) aminocarbonyl groups, 3 to 20 carbon di (hydroxyalkyl) aminocarbonyl groups, 3 to 20 carbon mono (alkoxyalkyl) aminocarbonyl groups, or 5 to 20 carbon di (alkoxy) Alkyl) aminocarbonyl group, R ² and R ³ and / or R ⁵ R ⁶ may be bonded to each other to form an aromatic ring condensed with a pyrrole ring, and the condensed aromatic rings formed by these may be the same or different, Formula (a)

(Wherein R ^{8 to} R ¹¹ are each independently a hydrogen atom, a halogen atom, a nitro group, a cyano group, a hydroxy group, an amino group, a carboxyl group, a sulfonic acid group, an alkyl group having 1 to 20 carbon atoms, or 1 carbon atom) -20 halogenoalkyl group, C1-C20 alkoxy group, C2-C20 alkenyl group, C2-C20 alkoxyalkyl group, C2-C20 alkoxyalkoxy group, C6-C20 Aryloxy group, C1-C20 acyl group, C2-C20 alkoxycarbonyl group, C2-C20 alkylaminocarbonyl group, C3-C20 dialkylaminocarbonyl group, C2-C2 20 alkylcarbonylamino groups, 7-20 carbon atoms phenylcarbonylamino group, 7-20 carbon atoms phenylaminocarbonyl group, 7-20 carbon atoms A phenoxycarbonyl group, an aralkyl group having 7 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a heteroaryl group having 4 to 20 carbon atoms, an alkylthio group having 1 to 20 carbon atoms, a phenylthio group having 6 to 20 carbon atoms, C3-C20 alkenyloxycarbonyl group, C8-C20 aralkyloxycarbonyl group, C4-C20 alkoxycarbonylalkoxycarbonyl group, C4-C20 alkylcarbonylalkoxycarbonyl group, C2-C2 20 mono (hydroxyalkyl) aminocarbonyl groups, 3 to 20 carbon di (hydroxyalkyl) aminocarbonyl groups, 3 to 20 carbon mono (alkoxyalkyl) aminocarbonyl groups, or 5 to 20 carbon di (alkoxy) alkyl) aminocarbonyl group, R ¹⁰ and R ¹¹ are each each other Bind to represent an aromatic ring may be formed). ]

  Furthermore, in the present invention, in order to further improve color reproducibility and obtain a vivid display image, it is more preferable to dispose a dye that selectively absorbs even in the vicinity of a wavelength of 400 nm in the organic dye dispersion layer.

  As this dye, for example, a dipyrazolylmethine dye of the general formula (V) represented by [Chemical Formula 7] is suitable.

[In the formula (V), R ⁹ represents an alkyl group which may have a substituent, an aryl group which may have a substituent, or a hydrogen atom, and R ¹⁰ has a substituent. An optionally substituted alkaryl group, an optionally substituted alkoxy group, an optionally substituted alkoxycarbonyl group, an optionally substituted aryl group, an aryloxy group, and a substituent. An aryloxycarbonyl group which may have, an amino group which may have a substituent, or a hydrogen atom, R ¹¹ has an alkyl group which may have a substituent, or a substituent. An optionally substituted cycloalkyl group, an optionally substituted aryl group or a hydrogen atom, X represents an oxygen atom or an NH group, and these R ¹⁰ , R ¹¹ , and X represent both pyrazoles The rings may be different from each other. ]

More specifically, compounds represented by the general formulas (V-1) to (V-9) represented by [Chemical Formula 8] are given as representative examples.

  Here, these dipyrazolyl methine compounds are exemplified by Liebigs Ann. Chem. , 1680-1688 (1976), or in accordance therewith.

  Moreover, although the said pigment | dye is excellent in controllability of an absorption spectrum, there exists a problem which is easy to receive deterioration by light or a heat | fever. Therefore, in the present invention, it is preferable to add a so-called light stabilizer having functions such as an ultraviolet absorption function, a free radical stabilization function, and an antioxidant function to the dye dispersion layer. Here, typical light stabilizers include organic ultraviolet absorbers (benzophenone, benzotriazole, ogizanide, formamidine), inorganic ultraviolet absorbers, hindered amine light stabilizers, aryl ester light stabilizers. Agents, phenol-based antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants. These are preferably blended in appropriate amounts to such an extent that the optical properties are not sacrificed to suppress deterioration of the organic dye.

  More specifically, for example, organic ultraviolet absorbers include 2- (2′-hydroxy-5′-t-butylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-). t-butylphenyl) benzotriazole, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octyloxybenzophenone, phenyl salsylate, 4-t-butylphenyl salsylate, 2,5-di- Examples thereof include t-butylphenyl 4-hydroxybenzoic acid n-hexadecyl ester, 2,4-di-t-butylphenyl 3 ′, 5′-di-t-butyl-4′-hydroxybenzoate and the like.

  Furthermore, examples of the inorganic ultraviolet absorber include titanium oxide, zinc oxide, cerium oxide, iron oxide, and barium sulfate. Here, as the ultraviolet absorber, the wavelength at which the transmittance is 50% is preferably 350 to 420 nm, more preferably 360 to 400 nm, and the ultraviolet absorbing ability is weak at wavelengths shorter than 350 nm and longer than 420 nm. The wavelength is not preferable because coloring becomes strong.

  In addition to the mode in which the light stabilizer is blended in the pigment dispersion layer as described above, a mode is also provided in which a layer that absorbs ultraviolet rays having a significant effect on the photodegradation is provided, thereby suppressing degradation of the pigment. Is possible. That is, an embodiment in which the pigment dispersion layer 5b is sandwiched between ultraviolet absorption and / or reflection layers, an embodiment in which a pigment is dispersed in one coating layer, and an ultraviolet absorber is dispersed in the other coating layer can be implemented.

  In the present invention, in order to keep the color reproducibility and vividness of an image sufficiently high, it is preferable that the number of light absorption peaks in the visible light region by the spectral characteristic adjusting filter is as small as possible. That is, when a filter is constructed using an inorganic substance or the like, in addition to the main absorption peak, a slight absorption peak appears in an unintended portion, which causes a deterioration in color tone and the like, and a desirable wavelength cut characteristic is obtained. However, in the present invention, since the above-designed dye is used for wavelength cut, the absorption wavelength can be controlled with high accuracy, and only a specific wavelength is used. It can be absorbed selectively.

  That is, the spectral characteristic adjusting filter has preferably 1 to 4, more preferably 1 to 3, particularly preferably 1 to 2 light absorption peaks in the visible light region, and an extra wavelength region. It is possible to cut only the necessary wavelength without cutting. In the present invention, the visible light region means a wavelength region of 380 nm to 780 nm.

Next, a color filter that constitutes the blue color filter of the present invention together with a spectral characteristic adjusting filter will be described.
The color filter is obtained by forming fine pixels such as red, green, and blue on a transparent substrate such as glass by a dyeing method, a printing method, an electrodeposition method, a pigment dispersion method, or the like. Further, in order to block light leakage between pixels and obtain a higher quality image, a light shielding pattern called a black matrix is often provided between the pixels. The blue color filter according to the present invention may be used alone or as a blue pixel of a color filter having a plurality of color regions (color pixels).

  In the electrodeposition method, a transparent substrate such as glass provided with an electrode is immersed in a bath containing a pigment or dye, and a color filter is formed by electrophoresis. A color filter by the pigment dispersion method forms a coating film on a transparent substrate such as glass by applying a composition in which a color material such as a pigment is dispersed or dissolved in a photosensitive resin, and is irradiated with radiation through a photomask. Exposure is performed, and unexposed portions are removed by development processing to form a pattern. In addition to these methods, a polyimide resin composition in which a color material is dispersed or dissolved is applied and a pixel image is formed by an etching method, and a film on which a resin composition containing the color material is applied is attached to a transparent substrate. It can also be manufactured by a method of peeling and image exposure, developing to form a pixel image, a method of forming a pixel image by an ink jet printer printing method, and the like.

  In the production of color filters for liquid crystal display elements in recent years, the pigment dispersion method has become the mainstream because of its high productivity and excellent microfabrication properties, but the present invention can be applied to any of the above production methods using pigments. Applicable.

  The black matrix is formed by forming a chromium and / or chromium oxide (laminated) film on the entire surface of a transparent substrate such as glass by sputtering, and then removing only the color pixel portion by etching. Dispersing or dissolving the light shielding component The coated photosensitive composition is coated on a transparent substrate such as glass to form a coating film, exposed to radiation through a photomask, and unexposed portions are removed by development processing to form a pattern. There are methods, etc.

  Next, raw materials for producing a color filter will be described by taking the pigment dispersion method that has been mainstream in recent years as an example.

  In the pigment dispersion method, as described above, a composition in which a color material such as a pigment is dispersed in a photosensitive resin (hereinafter referred to as “color filter composition”) is used. In the color filter composition according to the present invention, (a) a binder resin and / or (b) a monomer, (c) a photopolymerization initiator, (d) a coloring material, and (e) other components as a solvent as a photosensitive component. It is dissolved or dispersed in. The binder resin and monomer may be appropriately selected in consideration of the color filter manufacturing process. Hereinafter, each component will be described in detail.

(A) Binder resin When a binder resin is used alone, an appropriate one is appropriately selected in consideration of the formability and performance of the target image and the production method desired to be employed. When the binder resin is used in combination with the monomer described later, the binder resin is added to improve the color filter composition and improve the physical properties after photocuring. Therefore, in this case, the binder resin is appropriately selected according to the purpose of improving compatibility, film-forming property, developability, adhesiveness and the like.

  Examples of commonly used binder resins include (meth) acrylic acid, (meth) acrylic acid ester, (meth) acrylamide, maleic acid, (meth) acrylonitrile, styrene, vinyl acetate, vinylidene chloride, maleimide and the like. Examples of the polymer include polyethylene oxide, polyvinyl pyrrolidone, polyamide, polyurethane, polyester, polyether, polyethylene terephthalate, acetyl cellulose, novolac resin, resol resin, polyvinyl phenol, and polyvinyl butyral.

  Among these binder resins, preferred are those containing a carboxyl group or a phenolic hydroxyl group in the side chain or main chain. If a resin having these functional groups is used, development with an alkaline solution becomes possible. Among them, a resin having a carboxyl group, such as an acrylic acid (co) polymer, a styrene / maleic anhydride resin, a novolak epoxy acrylate acid anhydride-modified resin, and the like, which are highly alkaline developable.

  Particularly preferred is a (co) polymer containing (meth) acrylic acid or a (meth) acrylic acid ester having a carboxyl group (referred to herein as an acrylic resin). This resin is excellent in developability and transparency, and since various copolymers can be obtained by selecting various monomers, it is easy to control performance and production method.

  Examples of the acrylic resin include (meth) acrylic acid and / or succinic acid (2- (meth) acryloyloxyethyl) ester, adipic acid (2-acryloyloxyethyl) ester, phthalic acid (2- ( (Meth) acryloyloxyethyl) ester, hexahydrophthalic acid (2- (meth) acryloyloxyethyl) ester, maleic acid (2- (meth) acryloyloxyethyl) ester, succinic acid (2- (meth) acrylic) Leuoxypropyl) ester, adipic acid (2- (meth) acryloyloxypropyl) ester, hexahydrophthalic acid (2- (meth) acryloyloxypropyl) ester, phthalic acid (2- (meth) acryloyloxypropyl) ) Ester, maleic acid (2- (meth) acryloyloxypropyl) ester, succinic acid ( -(Meth) acryloyloxybutyl) ester, adipic acid (2- (meth) acryloyloxybutyl) ester, hexahydrophthalic acid (2- (meth) acryloyloxybutyl) ester, phthalic acid (2- (meta ) Acryloyloxybutyl) ester, maleic acid (2- (meth) acryloyloxybutyl) ester, hydroxyalkyl (meth) acrylate, (anhydrous) succinic acid, (anhydrous) phthalic acid, (anhydrous) maleic acid As an essential component, a compound to which an acid (anhydride) such as styrene is added, and if necessary, a styrene monomer such as styrene, α-methyl-styrene, vinyltoluene; cinnamic acid, maleic acid, fumaric acid, maleic anhydride, Unsaturated carboxylic acids such as itaconic acid; methyl (meth) acrylate, ethyl (meth) acrylate, propyl ( (Meth) acrylate, allyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, benzyl (meth) acrylate, hydroxyphenyl (meth) acrylate , Esters of (meth) acrylic acid such as methoxyphenyl (meth) acrylate; (meth) acrylic acid added with lactones such as ε-caprolactone, β-propiolactone, γ-butyrolactone, δ-valerolactone Compound that is: Acrylonitrile; (meth) acrylamide, N-methylolacrylamide, N, N-dimethylacrylamide, N-methacryloylmorpholine, N, N-dimethylaminoethyl (meth) acrylate, N, N Acrylamide such as dimethylaminoethyl acrylamide, vinyl acetate, vinyl versatate, vinyl propionate, vinyl cinnamate, vinyl acids such as vinyl pivalate or the like, a resin obtained by copolymerizing various monomers.

  In addition, styrene, α-methylstyrene, benzyl (meth) acrylate, hydroxyphenyl (meth) acrylate, methoxyphenyl (meth) acrylate, hydroxyphenyl (meth) acrylamide, hydroxyphenyl (meth) for the purpose of increasing the strength of the coating film. A monomer having a phenyl group such as acrylic sulfoamide is 10 to 98 mol%, preferably 20 to 80 mol%, more preferably 30 to 70 mol%, and (meth) acrylic acid or succinic acid (2- (meta ) Acryloyloxyethyl) ester, adipic acid (2-acryloyloxyethyl) ester, phthalic acid (2- (meth) acryloyloxyethyl) ester, hexahydrophthalic acid (2- (meth) acryloyloxyethyl) Ester, maleic acid (2- (meth) acryloyloxy 2 to 90 mol%, preferably 20 to 80 mol%, more preferably 30 to 70 mol% of at least one monomer selected from the group consisting of (meth) acrylic acid esters having a carboxyl group such as (til) ester An acrylic resin copolymerized at a ratio of% is also preferably used. In the present invention, for example, “(meth) acrylic acid” means “acrylic acid or methacrylic acid”, and (meth) acrylate, (meth) acryloyl group and the like have the same meaning.

  These resins preferably have an ethylenic double bond in the side chain. By using a binder resin having a double bond in the side chain, the photocurability of the composition for a color filter according to the present invention is increased, so that the resolution and adhesion can be further improved.

  As a means for introducing an ethylenic double bond into the binder resin, for example, a method described in JP-B-50-34443, JP-B-50-34444, or the like, that is, a glycidyl group or an epoxy is added to the carboxyl group of the resin. Examples thereof include a method of reacting a compound having both a cyclohexyl group and a (meth) acryloyl group, and a method of reacting an acrylic acid chloride with a hydroxyl group of the resin.

  For example, glycidyl (meth) acrylate, allyl glycidyl ether, glycidyl α-ethyl acrylate, crotonyl glycidyl ether, (iso) crotonic acid glycidyl ether, (3,4-epoxycyclohexyl) methyl (meth) acrylate, (meth) By reacting a compound such as acrylic acid chloride or (meth) allyl chloride with a resin having a carboxyl group or a hydroxyl group, a binder resin having an ethylenic double bond group in the side chain can be obtained. In particular, a resin obtained by reacting an alicyclic epoxy compound such as (3,4-epoxycyclohexyl) methyl (meth) acrylate is preferable as the binder resin.

  Thus, when an ethylenic double bond is introduced into a resin having a carboxylic acid group or a hydroxyl group in advance, the ethylenic double bond is added to 2 to 50 mol%, preferably 5 to 40 mol% of the carboxyl group or hydroxyl group of the resin. It is preferable to bind a compound having a bond.

The preferable range of the weight average molecular weight measured by GPC of these acrylic resins is 1,000 to 100,000. When the weight average molecular weight is 1,000 or less, it is difficult to obtain a uniform coating film, and when it exceeds 100,000, the developability tends to decrease. Moreover, the range of preferable content of a carboxyl group is 5-200 in an acid value. When the acid value is 5 or less, it becomes insoluble in an alkaline developer, and when it exceeds 200, the sensitivity may be lowered.
These binder resins are contained in the range of 10 to 80% by weight, preferably 20 to 70% by weight, based on the total solid content of the composition of the present invention.

(B) Monomer The monomer contained in the color filter composition according to the present invention is not particularly limited as long as it is a polymerizable low molecular compound, but it is an addition having at least one ethylenic double bond. A polymerizable compound (hereinafter abbreviated as “ethylenic compound”) is preferred. The ethylenic compound is a compound having an ethylenic double bond that undergoes addition polymerization and cures by the action of a photopolymerization initiation system (described later) when the composition of the present invention is irradiated with actinic rays. In addition, the monomer in this invention means the concept which opposes what is called a polymeric substance, and means the concept also containing a dimer, a trimer, and an oligomer other than the monomer of a narrow sense.

  Examples of the ethylenic compound include an unsaturated carboxylic acid, an ester thereof with a monohydroxy compound, an ester of an aliphatic polyhydroxy compound and an unsaturated carboxylic acid, an ester of an aromatic polyhydroxy compound and an unsaturated carboxylic acid, An ester, a polyisocyanate compound and a (meth) acryloyl-containing hydroxy compound obtained by an esterification reaction with a saturated carboxylic acid and a polyvalent carboxylic acid and the polyvalent hydroxy compound such as the above-mentioned aliphatic polyhydroxy compound or aromatic polyhydroxy compound; And an ethylenic compound having a urethane skeleton obtained by reacting.

  Esters of aliphatic polyhydroxy compounds and unsaturated carboxylic acids include ethylene glycol diacrylate, triethylene glycol diacrylate, trimethylolpropane triacrylate, trimethylol ethane triacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, penta Acrylic esters such as erythritol tetraacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, glycerol acrylate and the like can be mentioned. In addition, the acrylic acid part of these acrylates is a methacrylic acid ester replaced with a methacrylic acid part, an itaconic acid ester replaced with an itaconic acid part, a crotonic acid ester replaced with a crotonic acid part, or a maleic acid replaced with a maleic acid part Examples include esters.

  Examples of the ester of an aromatic polyhydroxy compound and an unsaturated carboxylic acid include hydroquinone diacrylate, hydroquinone dimethacrylate, resorcin diacrylate, resorcin dimethacrylate, and pyrogallol triacrylate.

  The ester obtained by the esterification reaction of an unsaturated carboxylic acid with a polyvalent carboxylic acid and a polyvalent hydroxy compound is not necessarily a single substance but may be a mixture. Representative examples include condensates of acrylic acid, phthalic acid and ethylene glycol, condensates of acrylic acid, maleic acid and diethylene glycol, condensates of methacrylic acid, terephthalic acid and pentaerythritol, acrylic acid, adipic acid, butanediol and glycerin. And the like.

  Examples of the ethylenic compound having a urethane skeleton obtained by reacting a polyisocyanate compound and a (meth) acryloyl group-containing hydroxy compound include aliphatic diisocyanates such as hexamethylene diisocyanate and trimethylhexamethylene diisocyanate; cyclohexane diisocyanate and isophorone diisocyanate Alicyclic diisocyanate bottles; aromatic diisocyanate bottles such as tolylene diisocyanate and diphenylmethane diisocyanate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 3-hydroxy (1,1,1-triacryloyloxymethyl) propane, Reaction product with hydroxy compound containing (meth) acryloyl group such as 3-hydroxy (1,1,1-trimethacryloyloxymethyl) propane And the like.

Other examples of the ethylenic compound used in the present invention include acrylamides such as ethylene bisacrylamide; allyl esters such as diallyl phthalate; vinyl group-containing compounds such as divinyl phthalate.
The compounding ratio of these ethylenic compounds is 10 to 80% by weight, preferably 20 to 70% by weight, based on the total solid content of the composition of the present invention.

(C) Photopolymerization initiation system When the composition for a color filter according to the present invention contains an ethylenic compound as the monomer (b), it directly absorbs light or is photosensitized to cause a decomposition reaction or hydrogen abstraction. A photopolymerization initiating system having a function of causing a reaction and generating a polymerization active radical is required.

  The photopolymerization initiation system used in the present invention is composed of a system in which an addition agent such as an accelerator is used in combination with the polymerization initiator. Examples of the polymerization initiator include metallocene compounds including titanocene compounds described in JP-A Nos. 59-152396 and 61-151197, and 2- (2) described in JP-A-10-39503. Hexaarylbiimidazole derivatives such as' -chlorophenyl) -4,5-diphenylimidazole, halomethyl-s-triazine derivatives, N-aryl-α-amino acids such as N-phenylglycine, N-aryl-α-amino acid salts And radical activators such as N-aryl-α-amino acid esters. Examples of the accelerator include N, N-dialkylaminobenzoic acid alkyl esters such as N, N-dimethylaminobenzoic acid ethyl ester, complex such as 2-mercaptobenzothiazole, 2-mercaptobenzoxazole, and 2-mercaptobenzimidazole. A mercapto compound having a ring or an aliphatic polyfunctional mercapto compound is used. A plurality of types of photopolymerization initiator and additive may be combined.

  The blending ratio of the photopolymerization initiation system is 0.1 to 30% by weight, preferably 0.5 to 20% by weight, more preferably 0.7 to 10% by weight, based on the total solid content of the composition of the present invention. If the blending ratio is extremely low, the sensitivity is lowered. On the other hand, if the blending ratio is extremely high, the solubility of the unexposed portion in the developer is lowered, and development failure tends to be induced.

In the composition according to the present invention, if necessary, a sensitizing dye corresponding to the wavelength of the image exposure light source can be blended for the purpose of increasing the sensitivity.
Examples of these sensitizing dyes include xanthene dyes described in JP-A-4-221958 and JP-A-4-219756, and heterocyclic rings described in JP-A-3-239703 and JP-A-5-289335. Coumarin dyes, 3-ketocoumarin compounds described in JP-A-3-239703 and JP-A-5-289335, pyromethene dyes described in JP-A-6-19240, and others, JP-A 47-2528, 54-155292, JP-B-45-37377, JP-A-48-84183, JP-A-52-112681, JP-A-58-15503, JP-A-60-88005, JP-A-59-56403 JP-A-2-69, JP-A-57-168088, JP-A-5-107761, JP-A-5-21024. Can be cited JP, dyes having a dialkyl aminobenzene skeleton described in JP-A-4-288818.

Of these sensitizing dyes, preferred are amino group-containing sensitizing dyes, and more preferred are compounds having an amino group and a phenyl group in the same molecule. Particularly preferred are, for example, 4,4′-bis (dimethylamino) benzophenone, 4,4′-bis (diethylamino) benzophenone, 2-aminobenzophenone, 4-aminobenzophenone, 4,4′-diaminobenzophenone, 3 Benzophenone compounds such as 3,3'-diaminobenzophenone and 3,4-diaminobenzophenone; 2- (p-dimethylaminophenyl) benzoxazole, 2- (p-diethylaminophenyl) benzoxazole, 2- (p-dimethylaminophenyl) ) Benzo [4,5] benzoxazole, 2- (p-dimethylaminophenyl) benzo [6,7] benzoxazole, 2,5-bis (p-diethylaminophenyl) 1,3,4-oxazole, 2- ( p-dimethylaminophenyl) benzothiazole, 2 -(P-diethylaminophenyl) benzothiazole, 2- (p-dimethylaminophenyl) benzimidazole, 2- (p-diethylaminophenyl) benzimidazole, 2,5-bis (p-diethylaminophenyl) 1,3,4 Thiadiazole, (p-dimethylaminophenyl) pyridine, (p-diethylaminophenyl) pyridine, (p-dimethylaminophenyl) quinoline, (p-diethylaminophenyl) quinoline, (p-dimethylaminophenyl) pyrimidine, (p-diethylaminophenyl) ) P-dialkylaminophenyl group-containing compounds such as pyrimidine. Of these, 4,4′-dialkylaminobenzophenone is most preferred.
The blending ratio of the sensitizing dye is 0 to 20% by weight, preferably 0.2 to 15% by weight, more preferably 0.5 to 10% by weight, based on the total solid content of the composition of the present invention.

(D) Color Material The color material used for the color filter in the present invention is mainly a pigment, but is not particularly limited and is appropriately selected depending on the intended use of the color filter. Examples of the color material include organic pigments, inorganic pigments, dyes, natural pigments, and the like, but organic pigments are preferable from the viewpoint of heat resistance and light resistance.

  In addition to organic pigments such as azo, phthalocyanine, quinacridone, benzimidazolone, isoindoline, dioxazine, indanthrone, perylene, diketopyrrolopyrrole, various inorganic pigments Is available.

  Specifically, for example, pigments having the following pigment numbers can be used. Note that terms such as “CI Pigment Blue 1” described below mean a color index (CI).

Blue colorant: C.I. I. Pigment Blue (P.B.) 1, 1: 2, 9, 14, 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 17, 19, 25, 27, 28, 29, 33, 35, 36, 56, 56: 1, 60, 61, 61: 1, 62, 63, 66, 67, 68, 71, 72, 73, 74, 75, 76, 78, 79

Violet colorant: C.I. I. Pigment Violet (P.V.) 1, 1: 1, 2, 2: 2, 3, 3: 1, 3: 3, 5, 5: 1, 14, 15, 16, 19, 23, 25, 27, 29, 31, 32, 37, 39, 42, 44, 47, 49, 50
Of course, other colorants can also be used.

(E) Other components The color filter composition according to the present invention is further added with a thermal polymerization inhibitor, a plasticizer, a storage stabilizer, a surface protective agent, a smoothing agent, a coating aid and other additives as necessary. be able to.

  As the thermal polymerization inhibitor, for example, hydroquinone, p-methoxyphenol, pyrogallol, catechol, 2,6-t-butyl-p-cresol, β-naphthol and the like are used. The blending amount of the thermal polymerization inhibitor is preferably in the range of 0 to 3% by weight with respect to the total solid content of the composition.

  Examples of the plasticizer include dioctyl phthalate, didodecyl phthalate, triethylene glycol dicaprylate, dimethyl glycol phthalate, tricresyl phosphate, dioctyl adipate, dibutyl sebacate, triacetyl glycerin and the like. The blending amount of these plasticizers is preferably in the range of 10% by weight or less with respect to the total solid content of the composition.

  Moreover, the composition for color filters of this invention can add suitably an adhesive improvement agent, an applicability improvement agent, a development improvement agent, etc. other than each said component.

  The color filter composition according to the present invention may be used by dissolving in a solvent in order to dissolve additives such as viscosity adjustment and photopolymerization initiation system. What is necessary is just to select a solvent suitably according to the structural component of a composition, such as (a) binder resin and (b) monomer.

  Examples of the solvent include diisopropyl ether, mineral spirit, n-pentane, amyl ether, ethyl caprylate, n-hexane, diethyl ether, isoprene, ethyl isobutyl ether, butyl stearate, n-octane, valsol # 2, and apco #. 18 solvent, diisobutylene, amyl acetate, butyl acetate, apcocinner, butyl ether, diisobutyl ketone, methylcyclohexene, methyl nonyl ketone, propyl ether, dodecane, soak solvent no. 1 and no. 2, amyl formate, dihexyl ether, diisopropyl ketone, Solvesso # 150, (n, sec, t-) butyl acetate, hexene, shell TS28 solvent, butyl chloride, ethyl amyl ketone, ethyl benzoate, amyl chloride, ethylene glycol diethyl ether , Ethyl orthoformate, methoxymethylpentanone, methyl butyl ketone, methyl hexyl ketone, methyl isobutyrate, benzonitrile, ethyl propionate, methyl cellosolve acetate, methyl isoamyl ketone, methyl isobutyl ketone, propyl acetate, amyl acetate, Amylforme, bicyclohexyl, diethylene glycol monoethyl ether acetate, dipentene, methoxymethylpentanol, methyl alcohol Ketone, methyl isopropyl ketone, propyl propionate, propylene glycol-t-butyl ether, methyl ethyl ketone, methyl cellosolve, ethyl cellosolve, ethyl cellosolve acetate, carbitol, cyclohexanone, ethyl acetate, propylene glycol, propylene glycol monomethyl ether, propylene glycol monomethyl ether Acetate, propylene glycol monoethyl ether, propylene glycol monoethyl ether acetate, dipropylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monomethyl ether acetate, 3-methoxypropionic acid, 3-ethoxypropionic acid, 3-ethoxy Methyl propionate, 3-ethoxypropyl Ethyl lopionate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, propyl 3-methoxypropionate, butyl 3-methoxypropionate, diglyme, ethylene glycol acetate, ethyl carbitol, butyl carbitol, ethylene glycol monobutyl ether , Propylene glycol-t-butyl ether, 3-methyl-3-methoxybutanol, tripropylene glycol methyl ether, 3-methyl-3-methoxybutyl acetate and the like. Two or more of these solvents may be used in combination.

(F) Production of Color Filter Composition and Color Filter An example of the color filter composition according to the present invention and a method for producing a color filter using the composition will be described.

(F-1) Production of color filter composition First, a color material is dispersed and adjusted to an ink state. The dispersion treatment is performed using a paint conditioner, a sand grinder, a ball mill, a roll mill, a stone mill, a jet mill, a homogenizer, or the like. Since the color material is finely divided by the dispersion treatment, the transmittance of transmitted light is improved and the coating characteristics are improved.

  The dispersion treatment is preferably performed in a system in which a colorant and a solvent are appropriately combined with a binder resin having a dispersion function, a dispersant such as a surfactant, a dispersion aid, and the like. In particular, it is preferable to use a polymer dispersant because it is excellent in dispersion stability over time.

  For example, when the dispersion treatment is performed using a sand grinder, it is preferable to use glass beads or zirconia beads having a diameter of 0.1 to several millimeters. The temperature during the dispersion treatment is usually set in the range of 0 ° C to 100 ° C, preferably room temperature to 80 ° C. The dispersion time varies depending on the composition of the ink (coloring material, solvent, dispersant), the size of the sand grinder, and the like, and therefore needs to be adjusted as appropriate.

  Next, the colored ink obtained by the above dispersion treatment is mixed with a binder resin, a monomer, a photopolymerization initiation system, and the like to obtain a uniform solution. In each step of dispersion treatment and mixing, fine dust is often mixed, and thus the obtained solution is preferably filtered with a filter or the like.

(F-2) Manufacture of color filter The color filter according to the present invention can be generally manufactured by forming pixel images of red, green and blue on a transparent substrate provided with a black matrix.

  The material of the transparent substrate is not particularly limited. Examples of the material include heat such as polyester such as polyethylene terephthalate, polyolefin such as polypropylene and polyethylene, thermoplastic sheet of polycarbonate, polymethyl methacrylate, polysulfone, epoxy resin, unsaturated polyester resin, and poly (meth) acrylic resin. Examples thereof include curable plastic sheets and various glass plates. Among these, a glass plate and a heat resistant plastic are preferable from the viewpoint of heat resistance.

  The transparent substrate may be previously subjected to corona discharge treatment, ozone treatment, thin film treatment of various polymers such as a silane coupling agent and a urethane polymer in order to improve physical properties such as surface adhesion.

  The black matrix is formed on a transparent substrate using a metal thin film or a black matrix pigment dispersion.

  The black matrix using a metal thin film is formed of, for example, a chromium single layer or two layers of chromium and chromium oxide. In this case, first, a thin film of the metal or metal / metal oxide is formed on the transparent substrate by vapor deposition or sputtering. Subsequently, a photosensitive film is formed thereon, and then the photosensitive film is exposed and developed using a photomask having a repetitive pattern such as a stripe, a mosaic, and a triangle to form a resist image. Thereafter, the thin film is etched to form a black matrix.

  When the black matrix pigment dispersion is used, a black matrix is formed using a photosensitive resin composition containing a black color material. For example, carbon black, bone black, graphite, iron black, aniline black, cyanine black, red or the like appropriately selected from inorganic or organic pigments and dyes, or a plurality of black color materials such as titanium black A black matrix is formed using a photosensitive resin composition containing a black color material obtained by mixing green, blue, and the like, in the same manner as in the following method for forming red, green, and blue pixel images.

  After applying and drying a color filter composition containing a blue coloring material on a transparent substrate provided with a black matrix, a photomask is placed on the composition, image exposure and development through the photomask, If necessary, a pixel image is formed by heat curing or photocuring to create a colored layer. In the case of forming other color regions, this operation is performed for each color filter composition to form a color filter image.

  Application of the color filter composition can be performed by an application apparatus such as a spinner, a wire par, a flow coater, a die coater, a roll coater, or a spray.

  Drying after application may be performed using a hot plate, IR oven, convection oven, or the like. The higher the drying temperature is, the higher the adhesion to the transparent substrate is. However, if the drying temperature is too high, the photopolymerization initiation system is decomposed, and thermal polymerization is easily induced to cause development failure. It is in the range of 150 ° C. The drying time ranges from 10 seconds to 10 minutes, preferably from 30 seconds to 5 minutes.

  The film thickness of the color filter composition after drying is 0.5 to 3 μm, and preferably 1 to 2 μm.

  When the color filter composition according to the present invention uses a binder resin and an ethylenic compound in combination, and the binder resin is an acrylic resin having an ethylenic double bond and a carboxyl group in the side chain. Since this has very high sensitivity and high resolving power, it is preferable that an image can be formed by exposure and development without providing an oxygen blocking layer such as polyvinyl alcohol.

  The exposure light source applicable to the color filter composition according to the present invention is not particularly limited. For example, a xenon lamp, a halogen lamp, a tungsten lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a metal halide lamp, and a medium pressure mercury lamp. A lamp light source such as a low-pressure mercury lamp, a carbon arc, or a fluorescent lamp, or a laser light source such as an argon ion laser, a YAG laser, an excimer laser, a nitrogen laser, a helium cadmium laser, or a semiconductor laser is used. When only a specific wavelength is used, an optical filter can be used.

  The color filter composition according to the present invention forms an image on a substrate by performing image exposure with such a light source and then developing with an organic solvent or an aqueous solution containing a surfactant and an alkali agent. be able to. This aqueous solution can further contain an organic solvent, a buffer, a dye or a pigment.

  Although there is no restriction | limiting in particular about the image development method, Usually, methods, such as immersion image development, spray image development, brush image development, and ultrasonic image development, are used at the image development temperature of 10-50 degreeC, Preferably 15-45 degreeC.

  Alkaline agents include inorganic alkali agents such as sodium silicate, potassium silicate, sodium hydroxide, potassium hydroxide, lithium hydroxide, tribasic sodium phosphate, dibasic sodium phosphate, sodium carbonate, potassium carbonate, sodium bicarbonate Or organic amines such as trimethylamine, diethylamine, isopropylamine, n-butylamine, monoethanolamine, diethanolamine, triethanolamine, and tetraalkylammonium hydroxide, which can be used alone or in combination.

  Examples of the surfactant include nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkyl aryl ethers, polyoxyethylene alkyl esters, sorbitan alkyl esters, monoglyceride alkyl esters; and alkylbenzene sulfonic acids. Anionic surfactants such as salts, alkylnaphthalene sulfonates, alkyl sulfates, alkyl sulfonates, and sulfosuccinic acid ester salts; amphoteric surfactants such as alkylbetaines and amino acids can be used.

  For example, isopropyl alcohol, benzyl alcohol, ethyl cellosolve, butyl cellosolve, phenyl cellosolve, propylene glycol, diacetone alcohol and the like can be used as the organic solvent when used alone or in combination with an aqueous solution.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited to a following example, unless the summary is exceeded. In the following examples, “parts” represents parts by weight.

(Production example of filter for spectral characteristic adjustment)
A transparent biaxially stretched polyethylene terephthalate film (Mitsubishi Chemical Polyester Film Co., Ltd. PET film, thickness 175 μm) is used as a base material and is represented by the formula (I-3) in a 30 wt% toluene solution of a polymethyl methacrylate resin as a binder resin. Each of the pyrazole-based squarylium compounds was mixed as shown in the table below to prepare a coating solution. The coating liquid was applied and dried by a bar coating method, and after uniformly coating, the solvent was dried to obtain an optical filter on which a pigment dispersion layer was formed. The spectral characteristic adjusting filter 1 is for use in the comparative example, and no dye is added.

(2) Manufacture of color filter (2-1) Manufacture of binder resin for color filter 20 parts of styrene / acrylic acid resin having an acid value of 200 and a weight average molecular weight of 5,000, 0.2 part of p-methoxyphenol, dodecyltrimethylammonium A flask was charged with 0.2 parts of chloride and 40 parts of propylene glycol monomethyl ether acetate, and 7.6 parts of (3,4-epoxycyclohexyl) methyl acrylate was added dropwise and reacted at a temperature of 100 ° C. for 30 hours. The reaction solution was reprecipitated in water and dried to obtain a resin. When neutralization titration with KOH was performed, the acid value of the resin was 80 mgKOH / g.

(2-2) Manufacture of resist solution Each component shown below was prepared at the following ratio and stirred with a stirrer until each component was completely dissolved to obtain a resist solution.
Binder resin solution 2.06 parts Dipentaerythritol hexaacrylate 0.21 part Photopolymerization initiation system 2- (2'-chlorophenyl) -4,5-diphenylimidazole 0.06 part 2-mercaptobenzothiazole 0.02 part・ 4,4′-bis (diethylamino) benzophenone 0.04 parts Solvent (propylene glycol monomethyl ether acetate) 5.41 parts Surfactant (FC-430 (manufactured by Sumitomo 3M)) 0.0003 parts

(Examples 1 and 2 and Comparative Example 1)
Propylene glycol monomethyl ether acetate 75 parts, blue pigment Pigment Blue (P.B) 15: 6 17 parts, urethane dispersion resin 8 parts are mixed and stirred with a stirrer for 3 hours to prepare a mill base with a solid content concentration of 25% by weight. did. 500 parts of 0.5 mmφ zirconia beads were used for this mill base and subjected to a dispersion treatment for 3 hours at a peripheral speed of 10 m / s in a bead mill apparatus with a residence time. B. A 15: 6 dispersion ink (P.B. 15: 6 ink) was obtained.
Pigment is changed to P.I. V. Except for the change to 23 B. A mill base was prepared with the same composition as that of 15: 6 ink, and dispersion treatment was performed for 2 hours with a residence time under the same dispersion conditions. V. 23 dispersion ink (P.V.23 ink) was obtained.

  Next, under the condition that the light source is a combination of the surface light source device having the relative light emission intensity distribution shown in FIG. The concentration of the above-mentioned pigment for realizing the degree (x, y) = (0.150, 0.060) was determined by CCM (Computer Color Matching) calculation. And the compounding quantity of each dispersion ink for achieving the density | concentration of each pigment obtained as a calculation result was calculated, and the dispersion ink mixture was prepared.

  For the total content of pigment used, P.I. The contents of B15: 6 and V23 were as shown in Table 12. Content of pigment The resist solution exemplified in the above resist solution production example is added to this dispersion ink mixture of pigment so that the film thickness after drying is 2.0 μm, and the final solid content concentration is 25%. Thus, a solvent (propylene glycol monomethyl ether acetate) was added to obtain a color filter composition.

The obtained color filter composition was applied and dried on a 10 cm × 10 cm glass substrate (AN635 manufactured by Asahi Glass Co., Ltd.) with a spin coater so that the dry film thickness was 2.0 μm. The entire surface of the substrate was irradiated with 200 mJ / cm ² of ultraviolet light, developed with an alkaline developer, and post-baked in an oven at 230 ° C. for 30 minutes to prepare color filter samples 1 to 3.

(3-1) Measurement of color characteristics Using Hitachi spectrophotometer U-3500, the transmittance was measured using glass as a reference, and the spectral characteristics of C light source of CIE standard, Examples 1, 2 and Comparative Examples Color calculation was performed using the spectral characteristics of the blue color filter according to No. 1. Table 12 shows the calculation results of chromaticity.

(3-2) Evaluation of contrast The contrast was measured with a light luminance measuring device (BM5 manufactured by Topcon Corporation). The method of evaluating the bias was performed by the following method. Two polarizing plates in a state in which the prepared spectral characteristic adjusting filter and a pixel sample of each color of the corresponding color filter are sandwiched between two polarizing plates and irradiated with a surface light source having the spectrum shown in FIG. Measure the amount of transmitted light when the polarization axis is parallel (transmitted) and orthogonal (blocked) with a brightness measurement device (Topcom BM5) to calculate the transmitted brightness / blocked brightness (contrast ratio). did. Table 12 shows the measurement results.

  As is apparent from Table 12, in Examples 1 and 2, which are blue color filters constituted by a combination of a color filter having a specific pigment composition ratio and a spectral characteristic adjusting filter having a characteristic absorption spectrum, It can be seen that a remarkable contrast improvement effect is obtained as compared with Comparative Example 1 having the same configuration as that of FIG.

It is a figure which shows the emission spectrum of the 3 wavelength tube (cold-cathode tube) used for the backlight of a general liquid crystal display device.

Claims (7)

A color filter in which at least a blue pigment is dispersed in a binder resin;
A blue color that is arranged in parallel with the color filter and includes a spectral characteristic adjustment filter in which a non-pigment dye is dispersed in a binder resin and has a maximum absorption wavelength range in the visible wavelength range of 455 nm to 540 nm and a half width of 50 nm or less. A color filter,
A blue color filter, wherein a ratio of the blue pigment to the whole pigment as a color forming material contained in the color filter is at least 90% or more.   The chromaticity at a viewing angle of 2 degrees of the blue color filter measured using a CIE standard C light source is 0.13 ≦ x ≦ 0.16, 0.05 ≦ for x and y in the CIE XYZ color system. The blue color filter according to claim 1, wherein y ≦ 0.13.   3. The blue color filter according to claim 1, wherein 10% or less of a violet pigment is contained with respect to the entire pigment as a color forming material contained in the color filter.   The non-pigment dye used for the spectral characteristic adjusting filter is selected from one or more of a pyrazole squarylium compound), a porphyrin compound and a dipyrromethene metal chelate compound. The blue color filter according to claim 3. A surface light source device;
A liquid crystal display panel;
The spectral characteristic adjustment filter according to any one of claims 1 to 4, which is disposed on an outgoing optical path of the surface light source device;
A color filter including at least a red pixel, a green pixel, and a blue pixel,
5. A liquid crystal display device using the color filter according to claim 1 as the blue pixel.   The liquid crystal display device according to claim 5, wherein the spectral characteristic adjusting filter is formed as an adhesive layer.   The spectral characteristic adjusting filter is formed as any one of a light guide, a light diffusion sheet, a polarizing film, an antireflection film, and a viewing angle widening film of a surface light source device included in the liquid crystal display device. Item 6. A liquid crystal display device according to item 5.

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