JP5757107B2 - Color filter for white light emitting diode light source and display device - Google Patents

Description

  The present invention relates to a color filter used in a liquid crystal display device or an organic EL display device, and a display device including the color filter.

Conventionally, in a liquid crystal display device, a CCFL (cold cathode fluorescent lamp) light source has been used as a light source of a backlight.
In recent years, white light emitting diode light sources (hereinafter sometimes simply referred to as “white LED light sources”) are employed in liquid crystal display devices in place of CCFL light sources from the viewpoint of low power consumption and expansion of a color reproduction region. (For example, patent document 1).

JP 2010-128310 A

  As a result of intensive studies by the present inventors, when comparing the CCFL light source and the white LED light source, even when the same color filter is combined with these light sources, the combination with the white LED light source is greater than when combined with the CCFL light source. It has been found that the chromaticity coordinate of the blue pixel of the color filter shifts to the red side, and the blue becomes reddish blue, and the display characteristics of the blue pixel deteriorate.

  The present invention has been made to solve the above problems, and a color filter that does not deteriorate the display characteristics of a blue pixel even when combined with a white LED light source, and a display device including the color filter and the white LED light source. The purpose is to provide.

  As a result of intensive studies by the present inventors, it has been found that a color filter that does not deteriorate the display characteristics of a blue pixel even when combined with a white LED light source can be obtained by incorporating a specific amount of a phthalocyanine blue pigment into the blue pixel. The present invention has been completed.

That is, the color filter according to the present invention is a white light emitting diode color filters for a light source having at least a red pixel, a green pixel and blue pixel, in the blue pixel, based on the total weight of the entire colorant, phthalocyanine 90% by mass or more of a blue pigment, and the phthalocyanine blue pigment is C.I. I. Pigment blue 15: 1, C.I. I. Pigment blue 15: 3, C.I. I. Pigment Blue 15: Ri one or more pigments der selected from the group consisting of 4 and zinc phthalocyanine pigment, the coloring material, C. I. Pigment Violet 23 is not contained,
The chromaticity coordinates of the blue pixel in the CIE 1931 color system are 0.125 ≦ x ≦ 0.140 and 0.110 ≦ y ≦ 0.140 when measured with a C light source .

In the blue pixel, C.I. I. Pigment blue 15: 1, C.I. I. Pigment blue 15: 3, C.I. I. Pigment Blue 15: 4 and 90% by mass or more of a phthalocyanine-based blue pigment that is one or more pigments selected from the group consisting of zinc phthalocyanine pigments . I. By not including the pigment violet 23, even when combined with a white LED light source, the chromaticity coordinate of the blue pixel is suppressed from shifting to the red side, and the display characteristics of the blue pixel are not deteriorated.

The color filter for a white light emitting diode light source according to the present invention satisfies 0.125 ≦ x ≦ 0.140 and 0.110 ≦ y ≦ 0.140 when the chromaticity coordinates of the blue pixel in the CIE 1931 color system are measured with a C light source.

  A display device according to the present invention includes a white light emitting diode light source and the color filter for the white light emitting diode light source.

Even when the white LED light source color filter according to the present invention is combined with a white LED light source, the display characteristics of the blue pixels do not deteriorate.
Since the display device according to the present invention includes the color filter, the display characteristics are excellent even when combined with a white LED light source.

FIG. 1 is a cross-sectional view schematically showing an example of a color filter for a white LED light source according to the present invention. FIG. 2 is a cross-sectional view schematically showing another example of the color filter for white LED light source according to the present invention. FIG. 3 is a cross-sectional view schematically showing an example of the liquid crystal display device of the present invention. FIG. 4 is a cross-sectional view schematically showing an example of the organic EL display device of the present invention.

In the present invention, chromaticity is a value in CIE chromaticity coordinates.
In the present invention, (meth) acrylate represents acrylate and / or methacrylate.
In the present invention, the resin is a concept including a polymer in addition to a monomer and an oligomer.
In the present invention, the molecular weight means a weight average molecular weight which is a polystyrene equivalent value measured by gel permeation chromatography (GPC) in a THF solvent when having a molecular weight distribution, and when having no molecular weight distribution, It means the molecular weight of the compound itself.

  Hereinafter, the color filter for white light emitting diode light source according to the present invention will be described first, and then the display device will be described.

(Color filter for white light-emitting diode light source)
The color filter for white light emitting diode light source according to the present invention is a color filter for white light emitting diode light source having at least a red pixel, a green pixel and a blue pixel, and in the blue pixel, It contains 90% by mass or more of a phthalocyanine blue pigment.

  In the blue pixel, by containing 90% by mass or more of the phthalocyanine-based blue pigment with respect to the total mass of the entire coloring material, the chromaticity coordinate of the blue pixel may be shifted to the red side even when combined with the white LED light source. It is suppressed and the display characteristics of blue pixels are not deteriorated.

FIG. 1 is a cross-sectional view schematically showing an example of a color filter for a white LED light source according to the present invention.
As shown in FIG. 1, the color filter usually includes a transparent substrate 10, a blue pixel 21, a green pixel 22, a red pixel 23, and a light shielding unit 30 that are colored pixels formed on the transparent substrate 10.
The color filter for white LED light source of the present invention is one in which, for example, a protective film, a transparent electrode film, an alignment film, a spacer, and the like are formed in addition to the transparent substrate 10, the colored pixels 21 to 23, and the light shielding portion 30. May be.
In FIG. 1 and the subsequent drawings, for convenience of explanation, the vertical and horizontal dimension ratios and the dimension ratios between the layers and the members are exaggerated as appropriate instead of the actual dimensions.

(Transparent substrate)
The transparent substrate 10 in the color filter for white LED light source of the present invention is not particularly limited as long as it is a base material transparent to visible light, and a transparent substrate used for a general color filter may be used. it can. For example, an inflexible transparent substrate such as quartz glass, alkali-free glass, or synthetic quartz plate, or a transparent transparent substrate such as a transparent resin film or an optical resin plate can be used.
Although the thickness of the transparent substrate 10 is not specifically limited, For example, the thing of about 100 micrometers-1 mm can be used according to the use of the color filter of this invention.

(Colored pixels)
The colored pixels in the color filter for the white LED light source of the present invention include the blue pixels 21, the green pixels 22, and the red pixels 23, as long as the blue pixels have the above-described color material. Pixels other than may be included.
Normally, the colored pixels are formed by curing the color filter resin composition of each color in the opening between the light shielding portions 30 formed on the transparent substrate 10 as shown in FIG.
Further, the arrangement of the colored pixels is not particularly limited, and for example, a general arrangement such as a stripe type, a mosaic type, a triangle type, or a four pixel arrangement type can be used. Moreover, the width | variety, area, etc. of a coloring pixel can be set arbitrarily.
The thickness of the colored pixel is appropriately controlled by adjusting the coating method, the solid content concentration, the viscosity, and the like of the color filter resin composition, but is usually preferably in the range of 1 to 5 μm.

(Blue pixel)
In the color filter for white LED light sources of this invention, a blue pixel contains a phthalocyanine blue pigment 90 mass% or more with respect to the total mass of the whole coloring material.
By containing 90% by mass or more of the phthalocyanine blue pigment, the chromaticity coordinate of the blue pixel is suppressed from shifting to the red side, and the display characteristics of the blue pixel are not deteriorated.

As the phthalocyanine blue pigment, a phthalocyanine blue pigment used in a conventionally known blue pixel can be used.
For example, as the phthalocyanine blue pigment, a copper phthalocyanine blue pigment or a zinc phthalocyanine blue pigment represented by the following general formula (1) is preferable.

  (In general formula (1), M represents a copper atom or a zinc atom, and 16 Xs are each independently a chlorine atom, a bromine atom or a hydrogen atom, and 10 or more hydrogen atoms.)

  The more hydrogen atoms as the substituent X in the general formula (1) (that is, the fewer halogen atoms), the better the color as a blue pigment.

Examples of the copper phthalocyanine blue pigment represented by the general formula (1) include PB15: 1, PB15: 3, PB15: 4, and PB15: 6. These commercial products usually include those having 9 or less hydrogen atoms in the general formula (1), but the sum of the proportions of 10 or more hydrogen atoms may be 50 mol% or more.
In the general formula (1), the ratio of those having 10 or more hydrogen atoms is, for example, MALDI (Matrix Assisted Laser Desorption / Ionization) using REFLEX II (Bruker Daltonics Co., Ltd.). Method) -TOF MS (Time of Flight Mass Spectrometry) can be obtained by analyzing the results.
For example, a peak corresponding to the mass number of a copper phthalocyanine-based blue pigment having a specific number of hydrogen atoms is specified, and the ratio (ratio) of the specific peak intensity to the entire copper phthalocyanine-based blue pigment is determined from the specific number of hydrogen atoms. The ratio of the copper phthalocyanine blue pigment to the total mass of the copper phthalocyanine blue pigment can be determined. Therefore, in order to obtain the ratio of the copper phthalocyanine blue pigment having 10 or more hydrogen atoms, the copper phthalocyanine series having 10, 11, 12, 13, 14, 15 and 16 hydrogen atoms can be obtained from the MALDI-TOF MS measurement results. The peak corresponding to the mass number of the blue pigment is specified, and the ratio of the sum of the seven peak intensities with respect to the entire copper phthalocyanine blue pigment may be obtained.

  Blue pixel phthalocyanine blue pigments include C.I. I. Pigment Blue (hereinafter simply referred to as “PB”) 15: 1, PB15: 3, PB15: 4, PB15: 6 and containing one or more pigments selected from the group consisting of zinc phthalocyanine pigments, It is preferable because the chromaticity coordinate of the blue pixel is suppressed from shifting to the red side, and the display characteristics of the blue pixel are improved.

In addition to the above phthalocyanine-based blue pigment, the blue pixel may appropriately include C.I. as necessary to adjust contrast, luminance, color, and the like within the scope of the present invention. I. Other coloring materials such as CI Pigment Violet (hereinafter simply referred to as “PV”) 23 may be included.
In the present invention, from the viewpoint of suppressing the chromaticity coordinate of the blue pixel from shifting to the red side, the content ratio of PV23 to the entire color material of the blue pixel is preferably 10% by mass or less.

  One phthalocyanine blue pigment may be used alone, or two or more phthalocyanine blue pigments may be used in combination.

As described above, the chromaticity of the blue pixel in the CIE1931 color system of the color filter for an LED light source according to the present invention is obtained by setting the content ratio of the phthalocyanine-based blue pigment to 90% by mass or more with respect to the entire color material in the blue pixel. The coordinates can be 0.125 ≦ x ≦ 0.140 and 0.110 ≦ y ≦ 0.140 when measured with a C light source. When the chromaticity coordinates of the blue pixel are within the above range when measured with a C light source, when the blue pixel is used in combination with a white LED light source, the chromaticity coordinate of the blue pixel is EBU standard or sRGB Shift to the standard blue chromaticity coordinates (x = 0.150, y = 0.060) near the standard or to a position where the blue color is stronger than that,
Blue display characteristics are improved.

(Green pixel and Red pixel)
The color filter for white LED light source according to the present invention has a green pixel and a red pixel in addition to the blue pixel.
The green pixel and the red pixel can be respectively a green pixel and a red pixel provided in a conventionally known color filter.
For example, for a green pixel, a conventionally known C.I. I. Pigment Green (hereinafter, simply referred to as “PG”) 1, PG4, PG7, PG36, or PG58 may be included. In addition to the green pigment, the green pixel may contain a yellow pigment such as conventionally known pigment yellow (hereinafter simply referred to as “PY”) 138 or PY150 in order to adjust the color. .
Further, for example, with respect to red pixels, conventionally known C.I. I. Pigment Red (hereinafter, simply referred to as “PR”) 177, PR242, PR254, or PR208 may be included. In addition to the red pigment, the red pixel may contain conventionally known yellow pigments such as PY139 and PY150 in order to adjust the color.

  Hereinafter, the resin composition for a color filter that cures to form the blue pixel will be described.

(Resin composition for color filter)
The resin composition for a color filter for forming a blue pixel is a conventionally known color filter resin composition such that the ratio of the phthalocyanine blue pigment is 90% by mass or more with respect to the total mass of the entire color material. What is necessary is just to prepare and use. That is, conventionally known pigment filters, binders, photoinitiators, catalysts, solvents, and other components other than the colorant may be those of conventionally known color filter resin compositions.
The resin composition for a color filter is generally composed of a dispersion containing a colorant, a dispersant, a binder and a solvent, and a clearing agent containing a photoinitiator, a curing agent, a catalyst, a binder, a solvent and the like. Hereinafter, each of these components will be described without distinguishing between the dispersion and the clearing agent.

(Color material)
In the present invention, the color material is a concept including a pigment and a dye.
In the resin composition for a color filter for forming a blue pixel, the ratio of the phthalocyanine blue pigment may be 90% by mass or more with respect to the total mass of the entire color material. Since other suitable conditions such as the content ratio of the phthalocyanine-based blue pigment have been described above, description thereof is omitted here.

The resin composition for a color filter for forming a red pixel may contain a red pigment such as PR177 described above and a yellow pigment such as PY150 as necessary. What is necessary is just to adjust suitably the content rate etc. of a pigment according to the color characteristic etc. which are requested | required. For example, the content ratio of the red pigment to the total mass of the entire color material of the red pixel is usually about 60 to 95% by mass. For example, when a yellow pigment is contained, the content ratio of the yellow pigment to the total mass of the entire color material of the red pixel is usually about 5 to 40% by mass.
The resin composition for a color filter for forming a green pixel may contain the above-described green pigment such as PG58 and, if necessary, a yellow pigment such as PY150. What is necessary is just to adjust suitably the content rate etc. of a pigment according to the color characteristic etc. which are requested | required. For example, the content ratio of the green pigment relative to the total mass of the entire color material of the green pixel is usually about 60 to 95% by mass. For example, when a yellow pigment is contained, the content ratio of the yellow pigment to the total mass of the entire color material of the green pixel is usually about 5 to 40% by mass.

(Pigment particle size)
The average primary particle size of the pigment used in the present invention is not particularly limited as long as it can produce a desired color when used as a colored pixel of a color filter. The average primary particle diameter of the pigment varies depending on the type of pigment used, but is preferably in the range of 10 to 50 nm, and more preferably in the range of 10 to 40 nm from the viewpoint of improving contrast. When the average primary particle diameter of the pigment is in the above range, the liquid crystal display device and the organic EL display device can be easily made to have high contrast and high quality.
In addition, the average particle diameter of the pigment in the color filter can be obtained by a method of directly measuring the size of primary particles from an electron micrograph. Specifically, the minor axis diameter and major axis diameter of each primary particle are measured, and the average is taken as the particle diameter of the particle. Next, for 100 particles, the volume (weight) of each particle is obtained by approximating the obtained particle size to a rectangular parallelepiped, and the volume average particle size is obtained and used as the average particle size. The same result can be obtained regardless of whether the electron microscope is a transmission type (TEM) or a scanning type (SEM).
The particle size of the pigment in the dispersion can be measured using a Nitraso Nanotrac particle size analyzer UPA-EX.

  In the resin composition for a color filter, the mass ratio (P / V) between the color material (P) and the solid content (V) other than the color material is 0.1 to 0.3. From the viewpoints of required optical properties such as luminance and color, and plate making.

(Dispersant)
In the color filter resin composition, a conventionally known dispersant can be used to disperse the pigment as necessary.
As such a dispersant, for example, a cationic, anionic, nonionic, amphoteric, silicone-based or fluorine-based surfactant described in Patent Document 1 can be used.
Further, for example, a polymer dispersant described in JP-A-2007-070342 is also preferably used.

  Examples of commercially available dispersants include trade name Polyflow No. manufactured by Kyoeisha Chemical Co., Ltd. 75, 90, 95, DIC Corporation product names MegaFuck F171, F172, F173, Big Chemie Japan Corporation DISPERBYK (registered trademark) 111, 130, 161, 162, 163, 164, 170, 182, 2000, 2001, trade names of Efka Co., Ltd., Efka 46, Efka 47, Zeneca Co., Ltd., trade names Solsperth 3000, 5000, 9000, 12000, 13240. 13940, 17000, 20000, 24000, 26000, 28000, and the like. Of these, DISPERBYK2000 manufactured by Big Chemie Japan Co., Ltd. is preferable.

  When the dispersant is used, the amount thereof may be appropriately adjusted. For example, the amount is preferably 20 to 100 parts by mass with respect to 100 parts by mass of the pigment.

(Binder)
The binder is a component that imparts film forming properties and adhesion to the coated surface to the color filter resin composition.
As a binder, the alkali-soluble, thermosetting, or thermoplastic binder used for the coloring pixel of a conventionally well-known color filter can be used. As such a binder, for example, a binder described in JP 2010-2746 A is preferable.

Examples of the alkali-soluble binder include ethylene, which is obtained by polymerizing monomers such as acrylic acid, methacrylic acid, dimer of acrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, vinyl acetic acid, and acid anhydrides thereof. -Vinyl acetate copolymer, ethylene-vinyl chloride copolymer, ethylene vinyl copolymer, polystyrene, acrylonitrile-styrene copolymer, ABS resin, polymethacrylic acid resin, ethylene methacrylic acid resin, polyvinyl chloride resin, chlorination Vinyl chloride, polyvinyl alcohol, cellulose acetate propionate, cellulose acetate butyrate, nylon 6, nylon 66, nylon 12, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyvinyl acetal, polyether ether Tons, polyether sulfone, polyphenylene sulfide, polyarylate, polyvinyl butyral, epoxy resins, phenoxy resins, polyimide resins, polyamide-imide resins, polyamic acid resins, polyether imide resins, phenolic resins, urea resins, and the like.
In addition, polymerizable monomers methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, sec-butyl (meth) acrylate, isobutyl (meth) acrylate, tert -Butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, n-decyl (meth) acrylate, 2-hydroxy Examples include ethyl methacrylate, benzyl methacrylate, styrene, α-methylstyrene, N-vinyl-2-pyrrolidone, glycidyl (meth) acrylate, and the like.
In the present invention, a commercially available binder can also be used. preferable.
The molecular weight of the alkali-soluble binder is preferably 5,000 to 50,000.

Examples of the thermosetting binder include a polymer composed of a structural unit represented by formula (1) and a structural unit represented by formula (2) described in JP 2010-2746 A (binder epoxy resin). ) Is preferred.
The molecular weight of the thermosetting binder is preferably 5,000 to 100,000.

  In the present invention, the alkali-soluble binder or the thermosetting binder may be used alone or in combination of two or more.

(Polymerization initiator)
When using an alkali-soluble or thermosetting binder as the binder for the color filter resin composition, it is preferable to use a polymerization initiator from the viewpoint of promoting the curing reaction.
The polymerization initiator may be appropriately selected and used depending on the type of curable group possessed by the binder. For example, a photopolymerization initiator and a thermal polymerization initiator described in Patent Document 1 and Japanese Patent Application Laid-Open No. 2007-70342 can be used.
As the photopolymerization initiator, for example, 2,2′-azobisisobutyronitrile (AIBN), 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one and the like are preferable. .

  Examples of commercially available photopolymerization initiators include trade names Irgacure 184, 369, 651, 819, and 907 manufactured by Ciba Specialty Chemicals Co., Ltd., and Darocur series manufactured by Merck. Can be mentioned.

  When a polymerization initiator is used, the amount thereof may be adjusted as appropriate. For example, the amount is preferably 1 to 20% by mass relative to the total mass of the total solid content of the color filter resin composition.

(Curing agent)
The thermosetting binder is usually combined with a curing agent. As a hardening | curing agent, what is used in combination with a conventionally well-known thermosetting binder can be used.
As the curing agent, for example, a curing agent described in JP 2010-2746 A is preferable.
A hardening | curing agent may be used individually by 1 type, and may be used in combination of 2 or more type.
When the curing agent is used, the blending amount is usually in the range of about 1 to 100 parts by mass, preferably 5 to 50 parts by mass, per 100 parts by mass of the component having an epoxy group.

(catalyst)
When using a thermosetting binder, in order to improve the hardness and heat resistance of a colored pixel, you may use the catalyst which can accelerate | stimulate the thermosetting reaction between an acid and an epoxy. As such a catalyst, a thermal latent catalyst that exhibits activity during heat curing can be used.
The heat-latent catalyst exhibits catalytic activity when heated, accelerates the curing reaction and gives good properties to the cured product, and is added as necessary. The thermal latent catalyst is preferably one that exhibits acid catalytic activity at a temperature of 60 ° C. or higher. As such, a compound obtained by neutralizing a protonic acid with a Lewis base, a compound obtained by neutralizing a Lewis acid with a Lewis base, Lewis Examples thereof include a mixture of an acid and a trialkyl phosphate, sulfonic acid esters, onium compounds, and the like, and various compounds described in JP-A-4-218561 can be used.
The blending amount in the case of using the heat latent catalyst is usually about 0.01 to 10.0 parts by mass with respect to 100 parts by mass in total of the thermosetting binder and the curing agent.

(solvent)
In order to adjust the viscosity, pigment dispersibility, and dispersion stability over time of the resin composition for a color filter, a solvent can be used as necessary.
Examples of the solvent include alcohols such as isopropanol described in Patent Document 1, ketones such as acetone and methyl ethyl ketone, aromatic hydrocarbons such as toluene and xylene, diethylene glycol dimethyl ether (also known as bis (2-methoxyethyl) ether). Glycol ethers such as propylene glycol monomethyl ether (also known as 1-methoxypropan-2-ol) and ethyl acetate, propylene glycol monomethyl ether acetate (also known as 2-methoxy-1-methylethyl acetate), propylene glycol monoethyl ether acetate ( Also known as 2-ethoxy-1-methylethyl acetate), 3-methoxybutyl acetate (also known as 3-methoxybutyl acetate) and butyl carbitol acetate (also known as 2- (2-butoxyethoxy acetate) Ethyl) acetate esters such as and the like.
Of these, diethylene glycol dimethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate and 3-methoxybutyl acetate are preferred.

  When the solvent is used, the amount thereof may be adjusted as appropriate. For example, the amount is preferably 10 to 90% by mass with respect to the total mass of the color filter resin composition.

(Other ingredients)
The color filter resin composition may contain various other components as required without departing from the spirit of the present invention.
For example, a pigment derivative may be included as long as the effects of the present invention are not impaired. Such a pigment derivative is a compound having a role of imparting a functional group to the pigment skeleton and adding various functions to the pigment. When a pigment derivative is added to the pigment at the time of pigment dispersion, the pigment-like skeleton of the pigment derivative is adsorbed or bonded to the surface of the pigment, whereby the surface of the pigment becomes polar, so that the affinity between the dispersant and the pigment is increased. It is considered that the dispersibility and dispersion stability can be secured. Examples of the pigment derivative include a derivative having a sulfonic acid group, a carboxyl group, a sulfonamide group, a phthalimidomethyl group, or the like in the above blue pigment or yellow pigment.

In addition to the pigment derivative, for example, a polymerization terminator, a chain transfer agent, a leveling agent, a plasticizer, a surfactant, an antifoaming agent, a silane coupling agent, an ultraviolet absorber, an adhesion promoter, and the like can be used.
Among these, surfactants that can be used include, for example, polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene oleyl ether, polyoxyethylene octyl phenyl ether, polyoxyethylene nonyl phenyl ether, polyethylene Examples include glycol dilaurate, polyethylene glycol distearate, sorbitan fatty acid esters, fatty acid-modified polyesters, and tertiary amine-modified polyurethanes. In addition, a fluorosurfactant can also be used.
Furthermore, examples of the plasticizer include dibutyl phthalate, dioctyl phthalate, and tricresyl. Examples of the antifoaming agent and leveling agent include silicon-based, fluorine-based, and acrylic compounds.

(Preparation of resin composition for color filter)
The color filter resin composition may be prepared by uniformly dissolving or dispersing a coloring material, a binder, and other components such as a pigment dispersant and a polymerization initiator that are used as desired in a solvent. There is no particular limitation, and it can be prepared by mixing using a known mixing means.
As a method for preparing a resin composition for a color filter, for example, as described in JP 2010-243604 A, a method in which the desired component is mixed in a solvent using a dispersing machine such as a ball mill is used. be able to.

(Method for forming colored pixels)
The method for forming the colored pixel is not particularly limited, and may be formed by using the color filter resin composition by, for example, a pixel forming method such as a conventionally known photolithography method described in Patent Document 1.
For example, when the color filter resin composition includes a photocurable binder, the color filter resin composition is applied to the application target surface (region) by an inkjet method or a spin coating method, and then is applied by ultraviolet rays through a photomask. After exposure (pattern exposure), the unexposed portion can be formed by washing (developing) with a solvent, an alkaline aqueous solution such as an aqueous potassium hydroxide solution, or the like. After applying the resin composition, heat treatment (pre-baking) may be performed before exposure. Further, heat treatment may be performed after development.

(Shading part)
The light shielding unit 30 is provided so as to surround the colored pixels 21 to 23 and the outside of the pixel formation region in order to improve the contrast of the display image. What is used for the conventionally well-known color filter can be employ | adopted for a light-shielding part.
The light shielding unit 30 may be a metal thin film such as chromium by sputtering, vacuum deposition, or the like. In addition, the light shielding part 30 may be a resin layer in which light shielding particles such as carbon fine particles, metal oxides, inorganic pigments, and organic pigments are contained in a binder.
The thickness of the light shielding part is about 100 to 400 nm in the case of a metal thin film, and about 0.5 to 2.5 μm in the case of a resin layer containing light shielding particles.

FIG. 2 is a cross-sectional view schematically showing another example of the color filter for white LED light source according to the present invention.
The LED light source color filter of FIG. 2 includes a protective film 40 formed to cover the colored pixels 21 to 23 in addition to the LED light source color filter 1 of FIG. Further, a transparent electrode film 50 for driving liquid crystal is formed on the protective film 40. An alignment film 60 is formed on the transparent electrode film 50.
The columnar spacer 70 has a shape of a convex spacer, and is formed at a plurality of predetermined positions on the transparent electrode film 50 in accordance with a region (non-display region) where the light shielding portion 30 is formed.
Hereinafter, the protective film, the transparent electrode film, the alignment film, and the spacer will be described.

(Protective film)
The protective film 40 is provided to flatten the surface of the color filter and prevent the components contained in the colored pixels 21 to 23 from eluting into other layers. The protective film 40 is formed by coloring a known negative-type photocurable resin composition or thermosetting resin composition having known transparency by a method such as spin coater, roll coater, spray, printing, and the like. It can form by apply | coating so that the light-shielding part 30 may be covered, and hardening with light and / or a heat | fever.
The thickness of the protective film 40 can be set in consideration of the light transmittance of the material used, the surface state of the color filter, and the like, and can be set, for example, in the range of 0.1 to 2.0 μm.

(Transparent electrode film)
The transparent electrode film 50 can be formed using indium tin oxide (ITO), zinc oxide (ZnO), tin oxide (SnO), or an alloy thereof. The thickness of the transparent electrode film can be about 20 to 500 nm, preferably about 80 to 300 nm.

(Alignment film)
The alignment film 60 can be formed by applying a coating solution containing a resin such as a polyimide resin by a known method such as spin coating, drying, curing with heat or light as necessary, and then rubbing. .

(Spacer)
A plurality of spacers are provided in a non-display area on the substrate in order to maintain a cell gap when the color filter is bonded to a liquid crystal driving side substrate such as a TFT array substrate. The shape and dimensions of the spacer are not particularly limited as long as the spacer can be selectively provided in a non-display region on the substrate and a predetermined cell gap can be maintained over the entire substrate.
When the columnar spacer 70 as shown in the figure is formed as the spacer, it has a constant height in the range of about 2 μm to 10 μm, and the protruding height (pattern thickness) is the thickness required for the liquid crystal layer, etc. Can be set as appropriate. The thickness of the columnar spacer 70 can be appropriately set within a range of about 5 to 20 μm. The formation density (density) of the columnar spacers 70 can be appropriately set in consideration of the thickness unevenness of the liquid crystal layer, the aperture ratio, the shape and material of the columnar spacers, for example, red, green and blue Necessary and sufficient spacer functions are expressed at a ratio of one for each set of colored pixels. The shape of such a columnar spacer is not particularly limited, and may be, for example, a columnar shape, a prismatic shape, a truncated cone shape, or a truncated pyramid shape.

  The spacer is applied, for example, directly on the transparent substrate by a method such as a spin coater, roll coater, spray, or printing, or through another layer such as a transparent electrode film, by applying a coating liquid of the curable resin composition, Dry to form a resin layer.

As an LED light source used in combination with the color filter according to the present invention, an LED light source (hereinafter, referred to as “RG phosphor”) that generates white light by combining a blue LED and a red / green phosphor (hereinafter also referred to as “RG phosphor”). , "LED (B-RG)") and LED that generates white light by combining a blue LED and an yttrium aluminum garnet phosphor (hereinafter also referred to as "YAG phosphor"). A light source (hereinafter sometimes referred to as “LED (B-YAG)”) is preferable.
Compared with the case where blue light, red LED, and green LED are combined to generate white light, the combination of the blue LED and RG phosphor or YAG phosphor generates white light. It can be inexpensive and downsized.

The RG phosphor may be any phosphor that absorbs blue light and emits red fluorescence and green fluorescence. For example, a conventionally known RG phosphor described in Patent Document 1 or Japanese Patent Application Laid-Open No. 2003-141905 is used. Can be used.
The YAG phosphor may be any phosphor that absorbs blue light and emits yellow fluorescence and green fluorescence. For example, a conventionally known YAG phosphor described in Patent Document 1 or Japanese Patent Application Laid-Open No. 2008-218486 is used. Can be used.

A display device according to the present invention includes a white light emitting diode light source and the color filter for the white light emitting diode light source.
Since the display device according to the present invention includes the color filter, even when combined with an LED light source, the display device has a contrast equivalent to or higher than that when combined with a CCFL light source, and is excellent in display quality.

Examples of such a display device include a liquid crystal display device and an organic electroluminescent (organic EL) display device.
Hereinafter, a liquid crystal display device and an organic EL display device will be described.

FIG. 3 is a cross-sectional view schematically showing an example of a liquid crystal display device as a display device of the present invention.
In the liquid crystal display device, for example, a gap portion 90 of about 1 to 10 μm is provided by facing the color filter of the present invention and an electrode substrate 80 such as a TFT substrate, and the liquid crystal compound L is filled in the gap portion 90. , And the periphery thereof is sealed with a sealing material 100.
An alignment film 60 is provided on the inner surface side of the electrode substrate 80 facing the color filter 1. Usually, an LED light source is disposed at a position opposite to the colored pixels 21 to 23 of the color filter 1 through a liquid crystal layer of a liquid crystal compound.

A driving method of the liquid crystal display device is not particularly limited, and a driving method used in a general liquid crystal display device can be employed. Examples of such a drive method include a TN method, an IPS method, an OCB method, and an MVA method. In the present invention, any of these methods can be preferably used.
The electrode substrate 80 facing the color filter 1 can be appropriately selected and used according to the driving method of the liquid crystal display device.
Furthermore, as the liquid crystal compound L filled in the gap portion 90, various liquid crystals having different dielectric anisotropy and mixtures thereof can be used according to the driving method of the liquid crystal display device of the present invention.

  The liquid crystal display device may include other optical members such as a light guide plate, a diffusion plate, and a prism sheet in addition to the above-described members.

(Organic EL display device)
The organic EL display device includes the above-described color filter of the present invention and an organic light emitter serving as an LED light source.
FIG. 4 is a cross-sectional view schematically showing an example of an organic EL display device as a display device of the present invention. The organic EL display device 3 includes a color filter 1 and an organic light emitter 120 (LED light source 110).
An organic protective layer 41 and an inorganic oxide film 130 may be provided between the color filter 1 and the organic light emitter 120.

As a method for laminating the organic light emitter 120, for example, the transparent anode 140, the hole injection layer 150, the hole transport layer 160, the light emitting layer 170, the electron injection layer 180, and the cathode 190 are sequentially formed on the upper surface of the color filter. Examples thereof include a method and a method in which the organic light-emitting body 120 formed on another substrate is bonded to the inorganic oxide film 130. As the transparent anode 140, the hole injection layer 150, the hole transport layer 160, the light emitting layer 170, the electron injection layer 180, the cathode 190, and other configurations in the organic light emitting body 120, known configurations can be appropriately used. The organic light emitting display device 3 thus manufactured can be applied to, for example, a passive drive type organic EL display device or an active drive type organic EL display device.
Note that the organic EL display device of the present invention is not limited to the configuration shown in FIG. 4, and can generally have a known configuration as an organic EL display device using a color filter.

  As a method for manufacturing a display device according to the present invention, any method may be used as long as the above-described components are stacked with high accuracy. Depending on the type of the display device, a general liquid crystal display device or an organic EL display device may be used. Manufacturing methods can be used.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and this embodiment has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

  Hereinafter, the present invention will be described more specifically with reference to examples. These descriptions do not limit the present invention.

The abbreviations of the compounds used in the synthesis examples are as shown in parentheses.
Methyl methacrylate (MMA)
Acrylic acid (AA)
2-hydroxyethyl methacrylate (HEMA)
Diethylene glycol dimethyl ether (DMDG)
2,2'-azobisisobutyronitrile (AIBN)
Glycidyl methacrylate (GMA)

  From the measurement results of MALDI-TOF MS, the copper phthalocyanine blue pigments used in the examples, PB15: 1, PB15: 3, PB15: 4, PB15: 6 and zinc phthalocyanine, have a ratio of 10 or more hydrogen atoms. The total was 50 mol% or more.

(Synthesis Example 1)
In a polymerization tank, 63 parts by mass of MMA, 12 parts by mass of AA, 6 parts by mass of HEMA and 88 parts by mass of DMDG were charged, stirred and dissolved, and then 7 parts by mass of AIBN was added and dissolved uniformly. Then, it stirred at 85 degreeC under nitrogen stream for 2 hours, and also was made to react at 100 degreeC for 1 hour. 7 parts by mass of GMA, 0.4 parts by mass of triethylamine and 0.2 parts by mass of hydroquinone were further added to the obtained solution, and the mixture was stirred at 100 ° C. for 5 hours to obtain a copolymer resin solution (solid content 50%). It was.

The following materials were mixed and stirred at room temperature to obtain a curable resin composition as a binder.
The above copolymer resin solution (solid content 50%): 16 parts by mass Dipentaerythritol pentaacrylate (trade name SR399 manufactured by Sartomer): 24 parts by mass Orthocresol novolak type epoxy resin (Product made by Yuka Shell Epoxy Co., Ltd.) Name Epicoat 180S70): 4 parts by mass 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one (trade name Irgacure 907 manufactured by Ciba Specialty Chemicals Co., Ltd.): 4 parts by mass Parts DMDG: 52 parts by mass

(Preparation of blue pixel color filter resin compositions 1-8)
The following materials were mixed and stirred at room temperature to prepare resin compositions 1 to 8 for color filters for blue pixels.

(Resin Composition 1 for Color Filters for Blue Pixels)
Blue pigment PB15: 1 (Monastral Blue LBX, average primary flowmeter 50 nm, manufactured by Zeneca Co., Ltd.): 100 parts by mass The curable resin composition (binder): 300 parts by mass Polymer dispersant (Bic Chemie Japan Co., Ltd.) Product name DISPERBYK2000): 500 parts by mass 3-methoxybutyl acetate (solvent): 2500 parts by mass

(Resin Composition 2 for Blue Pixel Color Filter)
Blue pigment PB15: 3 (manufactured by Zeneca Co., Ltd., Monostral Blue BG, average primary particle size 50 nm): 100 parts by mass The above curable resin composition (binder): 300 parts by mass Polymer dispersing agent (Bicchemy Japan Co., Ltd.) Product name DISPERBYK2000): 500 parts by mass 3-methoxybutyl acetate (solvent): 2500 parts by mass

(Resin Composition 3 for Blue Pixel Color Filter)
Blue pigment PB15: 4 (Heliogen Blue L7101F manufactured by BASF Corporation, average primary particle size 50 nm): 100 parts by mass The curable resin composition (binder): 300 parts by mass Polymer dispersant (Bic Chemie Japan, Inc.) Product name DISPERBYK2000): 500 parts by mass 3-methoxybutyl acetate (solvent): 2500 parts by mass

(Resin Composition 4 for Color Filter for Blue Pixel)
Blue pigment PB15: 6 (PB5502 manufactured by Ciba Co., Ltd., average primary particle size 50 nm): 100 parts by mass The curable resin composition (binder): 300 parts by mass Polymer dispersant (manufactured by Big Chemie Japan Co., Ltd.) Product name DISPERBYK2000): 500 parts by mass 3-methoxybutyl acetate (solvent): 2500 parts by mass

(Resin Composition 5 for Color Filters for Blue Pixels)
Blue pigment PB15: 6 (manufactured by DIC Corporation, average primary particle diameter 50 nm): 75 parts by mass Blue pigment zinc phthalocyanine pigment (manufactured by DIC Corporation, average primary particle diameter 50 nm): 25 parts by mass The above curable resin Composition (binder): 300 parts by mass Polymer dispersant (trade name DISPERBYK2000 manufactured by BYK Japan KK): 500 parts by mass 3-methoxybutyl acetate (solvent): 2500 parts by mass

(Resin Composition 6 for Color Filters for Blue Pixels)
Blue pigment PB15: 6 (manufactured by Sanyo Dye Co., Ltd., average primary particle size 50 nm): 89 parts by mass Purple pigment PV23 (manufactured by Sanyo Dye Co., Ltd., average primary particle size 50 nm): 11 parts by mass The above curable resin Composition (binder): 300 parts by mass Polymer dispersant (trade name DISPERBYK2000 manufactured by BYK Japan KK): 500 parts by mass 3-methoxybutyl acetate (solvent): 2500 parts by mass

(Resin Composition 7 for Blue Pixel Color Filter)
Blue pigment PB15: 6 (manufactured by Sanyo Dye Co., Ltd., average primary particle size 50 nm): 80 parts by mass Purple pigment PV23 (manufactured by Sanyo Dye Co., Ltd., average primary particle size 50 nm): 20 parts by mass The above curable resin Composition (binder): 300 parts by mass Polymer dispersant (trade name DISPERBYK2000 manufactured by BYK Japan KK): 500 parts by mass 3-methoxybutyl acetate (solvent): 2500 parts by mass

(Resin Composition 8 for Color Filters for Blue Pixels)
Blue pigment PB15: 6 (manufactured by Sanyo Dye Co., Ltd., average primary particle size 50 nm): 70 parts by mass Purple pigment PV23 (manufactured by Sanyo Dye Co., Ltd., average primary particle size 50 nm): 30 parts by mass The above curable resin Composition (binder): 300 parts by mass Polymer dispersant (trade name DISPERBYK2000 manufactured by BYK Japan KK): 500 parts by mass 3-methoxybutyl acetate (solvent): 2500 parts by mass

  Table 1 summarizes the contents of the color materials of the resin composition for a color filter of the blue pixel.

Example 1
The prepared resin composition 1 for a color filter for blue pixels was applied on a 0.7 mm thick glass substrate (“NA35” manufactured by NH Techno Glass Co., Ltd.) using a spin coater. Then, it heat-dried for 3 minutes on an 80 degreeC hotplate. A monochromatic blue color filter having a blue colored solid film was obtained by irradiating 60 mJ / cm ² of ultraviolet rays using an ultra-high pressure mercury lamp and post-baking in a clean oven at 230 ° C. for 30 minutes.
The film thickness of the blue film after curing was adjusted so that the target chromaticity y = 0.127 in CIE 1931 was obtained when the chromaticity coordinates of the blue film were measured with a C light source. The chromaticity x (C light source) of the blue film at that time is also shown in Table 1.
Chromaticity coordinates (x, y) in CIE1931 when the obtained blue color filter and white LED light source are combined, white LED (B-YAG) as a light source, and microscopic differential light manufactured by Olympus Corporation as a measuring device It measured using the measuring apparatus and brand name OSP-SP200.

(Examples 2-3, Reference Examples 4-5 and Comparative Examples 1-3)
Instead of using the resin composition 1 for a color filter in order to create a blue film in Example 1, in the same manner as in Example 1 except that it was formed using each resin composition shown in Table 1, each to obtain a blue color filter of a single color.
As in Example 1 for each blue color filter was measured chromaticity x (C light source) when adjusting the film thickness of the blue film so that the target chromaticity y = 0.127 (C light source) in the CIE 1931.
Further chromaticity coordinates (x, y) in CIE1931 when combining a white LED (B-YAG) as a light source to each blue color filters of Example 1 and microspectroscopy of Olympus Corp. as a measuring device in the same manner It measured using the measuring apparatus and brand name OSP-SP200 .
The measurement results for each blue color filters are also shown in Table 1.

(Summary of results)
As shown in Table 1, in Examples 1 to 3 , the film thickness of the blue film was adjusted so that the target chromaticity y = 0.127 in CIE1931 was obtained when the chromaticity coordinates of the blue film were measured with a C light source. As a result, the chromaticity x (C light source) of the blue film was in the range of 0.126 to 0.127 . When the single color blue color filter with the blue film thickness adjusted in this way was combined with the LED light source, the blue film chromaticity coordinates were suppressed from shifting to the red side, and the display characteristics of the blue film were not deteriorated. .
On the other hand, in Comparative Examples 1 to 3, the film thickness of the blue film is set so that the target chromaticity y = 0.127 (the same target value as in the example) in CIE1931 is obtained when the chromaticity coordinates of the blue film are measured with a C light source. As a result of the adjustment, the chromaticity x (C light source) of the blue film was 0.143 or more. Thus, when the monochromatic blue color filter which adjusted the film thickness of the blue film | membrane was combined with the LED light source, the chromaticity coordinate of the blue film | membrane shifted to the red side, and the display characteristic of the blue film | membrane fell.

DESCRIPTION OF SYMBOLS 1 Color filter for LED light sources 2 Liquid crystal display device 3 Organic EL display device 10 Transparent substrate 21 Blue pixel 22 Green pixel 23 Red pixel 30 Light-shielding part 40 Protective film 41 Organic protective film 50 Transparent electrode film 60 Alignment film 70 Spacer 80 Electrode substrate 90 Gaps (Liquid Crystal Compound L)
DESCRIPTION OF SYMBOLS 100 Sealing material 110 LED light source 120 Organic light-emitting body 130 Inorganic oxide film 140 Transparent anode 150 Hole injection layer 160 Hole transport layer 170 Light emitting layer 180 Electron injection layer 190 Cathode

Claims (2)

A white light emitting diode light source color filter having at least a red pixel, a green pixel and a blue pixel,
The blue pixel contains 90% by mass or more of phthalocyanine blue pigment with respect to the total mass of the entire coloring material, and the phthalocyanine blue pigment contains C.I. I. Pigment blue 15: 1, C.I. I. Pigment blue 15: 3, C.I. I. Pigment Blue 15: Ri one or more pigments der selected from the group consisting of 4 and zinc phthalocyanine pigment, the coloring material, C. I. Pigment Violet 23 is not contained,
A color filter for a white light-emitting diode light source, wherein chromaticity coordinates of the blue pixel in the CIE 1931 color system are 0.125 ≦ x ≦ 0.140 and 0.110 ≦ y ≦ 0.140 when measured with a C light source . A display device comprising: a white light-emitting diode light source; and the white light-emitting diode light source color filter according to claim 1 .

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