WO2009087886A1 - 液晶表示装置及び液晶表示装置用カラーフィルタ - Google Patents
液晶表示装置及び液晶表示装置用カラーフィルタ Download PDFInfo
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- WO2009087886A1 WO2009087886A1 PCT/JP2008/073216 JP2008073216W WO2009087886A1 WO 2009087886 A1 WO2009087886 A1 WO 2009087886A1 JP 2008073216 W JP2008073216 W JP 2008073216W WO 2009087886 A1 WO2009087886 A1 WO 2009087886A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/201—Filters in the form of arrays
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
- C09B67/0033—Blends of pigments; Mixtured crystals; Solid solutions
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
- C09B67/0071—Process features in the making of dyestuff preparations; Dehydrating agents; Dispersing agents; Dustfree compositions
- C09B67/0084—Dispersions of dyes
- C09B67/0085—Non common dispersing agents
- C09B67/009—Non common dispersing agents polymeric dispersing agent
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
- G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
Definitions
- the present invention relates to a liquid crystal display device and a color filter for a liquid crystal display device, and in particular, the electrical properties of the colored layer and the overcoat layer do not adversely affect the switching property of the liquid crystal and the display device, and have excellent color reproducibility.
- the present invention relates to a liquid crystal display device including a color filter.
- Color liquid crystal display devices are rapidly spreading mainly in television image display devices and computer terminal display devices.
- the color filter is an indispensable important member for color display of such a liquid crystal display device.
- liquid crystal display devices are highly demanded to improve image quality, and various new types of liquid crystal display devices having a high viewing angle and high-speed response have appeared.
- IPS method is a method that is expected to be widely used because of its excellent display quality such as viewing angle and contrast ratio.
- a horizontal electric field type liquid crystal display device is different from other twisted nematic methods (TN method), vertical alignment method (VA method), and the like because a colored layer of a color filter is present in the liquid crystal driving electric field.
- TN method twisted nematic methods
- VA method vertical alignment method
- a liquid crystal orientation disorder caused by the electrical characteristics of the colored layer and a burn-in phenomenon due to a switching threshold shift (an image is long on the display screen).
- Various display defects such as a phenomenon that persisted over time) occurred.
- the electrical characteristics of the colored layer material are mainly due to the nature of the pigment that is the colorant, and it is difficult to fundamentally avoid the influence of this, so the color filter using the conventional colored layer material is applied to the lateral electric field system.
- a protective layer (overcoat layer) made of a transparent resin is generally provided (see, for example, Japanese Patent Application Laid-Open No. 2004-117537).
- an overcoat layer made of a transparent resin it is possible to use a conventional colored layer material in a horizontal electric field type liquid crystal display device, but various display defects occur even if an overcoat layer is used.
- both the coloring layer material and the overcoat layer material have been improved so as to be compatible with a horizontal electric field type liquid crystal display device (see, for example, Japanese Patent Application Laid-Open No. 2006-113099).
- An object of the present invention is to provide a color filter excellent in color reproducibility, in particular, in a liquid crystal display device of a horizontal electric field type, in which the electrical properties of the colored layer of the color filter do not adversely affect the switching performance of the liquid crystal.
- the object is to provide a liquid crystal display device.
- the color filter is colored green.
- the layer contains a brominated zinc phthalocyanine green pigment (hereinafter referred to as CI Pigment Green 58), and the dielectric loss tangent of the green colored layer at the driving frequency of the liquid crystal display device is 0.02 or less.
- a liquid crystal display comprising a backlight comprising an LED (light emitting diode) and a color filter comprising an overcoat layer comprising at least a plurality of colored layers including a green colored layer and a transparent resin.
- the green colored layer of the color filter is C.I. I.
- a liquid crystal display device comprising Pigment Green 58 (brominated zinc phthalocyanine green pigment) and having a dielectric loss tangent at a driving frequency of the liquid crystal display device of a laminate of a green coloring layer and an overcoat layer is 0.02 or less.
- a color filter for a liquid crystal display device as described above, wherein the green colored layer is C.I. I. Pigment Green 58 (brominated zinc phthalocyanine green pigment) containing a green pigment and a yellow pigment, and C.I. I.
- the pigment green 58 has a weight ratio of 60% or less and the pigment weight ratio to the green colored layer is 30% or less.
- a color filter for a liquid crystal display device as described above, wherein the green colored layer is C.I. I.
- a green pigment composed of CI Pigment Green 58; I. Pigment yellow 185, C.I. I. Pigment yellow 150, C.I. I. Pigment yellow 139, and C.I. I. Pigment Yellow 138 and one or more yellow pigments selected from the group consisting of C.I. I.
- the pigment green 58 has a weight ratio of 60% or less and the pigment weight ratio to the green colored layer is 30% or less.
- CCFL cold cathode fluorescent tube
- the liquid crystal alignment defect and the switching threshold shift of the horizontal electric field type liquid crystal display device are mainly caused by the dielectric characteristics of the colored layer material. I know that.
- Dielectric loss tangent (tan ⁇ ) is the ratio between the amount of charge accumulated in the dielectric and the amount of charge consumed. If the dielectric loss tangent is relatively small, the charge accumulated in the dielectric is retained, whereas if the dielectric loss tangent is relatively large, the charge is consumed and not retained.
- a horizontal electric field type liquid crystal display device since the colored layer of the color filter is inherent in the liquid crystal driving electric field, the dielectric loss tangent of the colored layer of the color filter and the dielectric loss tangent of the members (liquid crystal, alignment film, etc.) in other cells If the values of and differ greatly, the charge holding state becomes non-uniform. If the charge holding state becomes non-uniform, a vertical electric field that should not be generated in a horizontal electric field type liquid crystal display device is generated, thereby causing liquid crystal alignment failure or remaining electric charge. An image burn-in phenomenon (a phenomenon in which an image remains in the display screen for a long time) occurs due to a threshold shift due to this, resulting in a display defect.
- the dielectric loss tangent of the coloring material of the color filter is an important characteristic that determines the display characteristics of the horizontal electric field type liquid crystal display device.
- the dielectric loss tangent is a value depending on the measurement frequency, but since one frame for driving the liquid crystal is about 60 Hz to 120 Hz, the period (second), that is, the frequency is around 30 Hz to 60 Hz, and the dielectric loss tangent at a frequency of about 10 to 200 Hz. It is appropriate to focus on.
- a liquid crystal material, an alignment film material, etc. are materials having a large ability to hold electric charges, that is, materials having a relatively small dielectric loss tangent, and their values are generally about 0.005 to 0.02. It is considered that the value of the dielectric loss tangent of the coloring material of the color filter used in the horizontal electric field type liquid crystal display device is preferably the same value as the dielectric loss tangent of the liquid crystal material and the alignment film material.
- the cause of the deterioration of the dielectric characteristics in the conventional color filter is the presence of a free low molecular weight compound containing halogen caused by copper halide phthalocyanine (CI Pigment Green 36) used as a green pigment, and the amount of this compound It has been found effective to suppress this.
- CI Pigment Green 36 copper halide phthalocyanine
- the green color layer of the color filter is bromine.
- a color filter containing a zinc phthalocyanine green pigment CI Pigment Green 58
- CI Pigment Green 58 zinc phthalocyanine green pigment
- the liquid crystal display device includes a backlight including an LED (light emitting diode) and a color filter including a plurality of colored layers including a green colored layer, and the color filter Green colored layer of C.I. I. Pigment Green 58 is included, and a dielectric loss tangent of the green colored layer at a driving frequency of the liquid crystal display device is 0.02 or less.
- the dielectric loss tangent at the driving frequency of the liquid crystal display device of the laminate of the green coloring layer and the overcoat layer is 0.02 or less, preferably 0.01. It has been found that by using the following color filter, it is possible to effectively prevent deterioration in display quality such as pixel orientation failure and threshold shift while maintaining high color reproducibility.
- the liquid crystal display device includes a backlight having an LED (light emitting diode), a color having at least a plurality of colored layers including a green colored layer, and an overcoat layer made of a transparent resin.
- the green colored layer of the color filter is C.I. I. Pigment Green 58 (brominated zinc phthalocyanine green pigment), and the dielectric loss tangent at the driving frequency of the liquid crystal display device of the laminate of the green colored layer and the overcoat layer is 0.02 or less.
- Dielectric property is C.I. present in the green colored layer.
- coloring materials such as pigment green 58 (brominated zinc phthalocyanine green pigment)
- the content thereof is 30% by weight or less, preferably 20% by weight in the solid content of the green colored layer. % Or less, more preferably 18% by weight or less.
- the chromaticity when using a backlight having LEDs is preferably 0.60 or more in the XYZ color system. Is 0.62 or more, and the color reproduction range as a color filter is required to be 70% or more in terms of NTSC ratio.
- the content of the green colorant layer in the solid content does not fall below 10% by weight.
- the backlight may include a red LED, a green LED, and a blue LED.
- the backlight may include a white LED device composed of a combination of a blue LED, a green phosphor, and a red phosphor.
- the liquid crystal display device includes a dielectric loss tangent at a driving frequency of a backlight including an LED and a green colored layer or a laminate of a green colored layer and an overcoat layer.
- the electrical property of the colored layer of the color filter does not adversely affect the switching performance of the liquid crystal. And excellent in color reproducibility.
- the green pigment has particularly poor dielectric properties. Therefore, C.I. I. It is necessary to reduce the content of Pigment Green 58 as much as possible. I. In a green colored layer containing Pigment Green 58 and a yellow pigment, C.I. I.
- the pigment green 58 needs to have a weight ratio of 70% or less, preferably 60% or less, and more preferably 50% or less.
- the content ratio of Pigment Green 58 is preferably small, but if it is too small, the transmittance of the green region increases and the color reproducibility deteriorates, so about 35% is the lower limit.
- the transparent substrate used in the color filter substrate preferably has a certain transmittance with respect to visible light, and more preferably 80% or more. What has a light transmittance can be used. In general, it may be one used in a liquid crystal display device, and examples thereof include a plastic substrate such as PET and glass, but a glass substrate is usually preferable.
- a light shielding pattern called a black matrix a pixel thin film formed of a metal thin film such as chromium or a light shielding resin in advance is formed on a transparent substrate by a publicly known method, and a partition for each pixel may be used.
- the production method of the colored layer on the transparent substrate may be produced by any known method such as an inkjet method, a printing method, a photoresist method, or an etching method.
- a colored composition in which a pigment is dispersed in a suitable solvent together with a photoinitiator and a polymerizable monomer in a transparent resin is coated on a transparent substrate.
- a photolithography method is preferable in which a film is formed, a colored composition layer is formed, this is subjected to pattern exposure, and development is performed to form a pixel of one color, and this step is repeated for each color of, for example, red, green, and blue.
- a method for forming a colored layer constituting a pixel included in the color filter by a photolithography method is performed, for example, as follows. First, a pigment serving as a colorant is dispersed in a transparent resin, and then mixed with an appropriate solvent together with a photoinitiator and a polymerizable monomer to prepare a colored composition.
- a method of dispersing the pigment serving as the colorant in the transparent resin there are methods using various apparatuses such as a mill base, a three roll, a jet mill and the like, and there is no particular limitation.
- organic pigments that can be used in the color composition for forming the color layers constituting the red, green, and blue pixels of the color filter are shown below by color index numbers.
- ⁇ As yellow pigment C.I. I.
- Pigment Yellow 150 and PY138 PY1, 2, 3, 4, 5, 6, 10, 12, 13, 14, 15, 16, 17, 18, 20, 24, 31, 32, 34, 35, 35 : 1, 36, 36: 1, 37, 37: 1, 40, 42, 43, 53, 55, 60, 61, 62, 63, 65, 73, 74, 77, 81, 83, 86, 93, 94 95, 97, 98, 100, 101, 104, 106, 108, 109, 110, 113, 114, 115, 116, 117, 118, 119, 120, 123, 125, 126, 127, 128, 129, 137 139, 144, 146, 147, 148, 151, 152, 153, 154, 155, 156, 161, 162, 164, 166, 167, 168, 169, 170, 17 1,172,173,174,175,176,177,179,180,181,182,
- Orange pigment is C.I. I. Pigment Orange 36, 43, 51, 55, 59, 61, 71, 73 and the like.
- Green pigments include C.I. I. In addition to Pigment Green 36, PG7, 10, 37, and the like can be given.
- the pigments described above can be used alone or in combination of two or more depending on the colored layer.
- inorganic pigments can be used in combination in order to ensure good coatability, sensitivity, developability and the like while balancing saturation and lightness.
- Inorganic pigments include yellow lead, zinc yellow, red pepper (red iron oxide (III)), cadmium red, ultramarine, bitumen, chromium oxide green, cobalt green, and other metal oxide powders, metal sulfide powders, metal powders, etc. Can be mentioned.
- a dye can be contained within a range that does not lower the heat resistance.
- the transparent resin used for the coloring composition is a resin having a transmittance of preferably 80% or more, more preferably 95% or more in the entire wavelength region of 400 to 700 nm in the visible light region.
- the transparent resin includes a thermoplastic resin, a thermosetting resin, and a photosensitive resin. If necessary, the transparent resin can be used alone or in combination of two or more monomers or oligomers, which are precursors thereof, which are cured by irradiation with radiation to produce a transparent resin.
- thermoplastic resin examples include butyral resin, styrene-maleic acid copolymer, chlorinated polyethylene, chlorinated polypropylene, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl acetate, polyurethane resin, and polyester resin. , Acrylic resins, alkyd resins, polystyrene, polyamide resins, rubber resins, cyclized rubber resins, celluloses, polyethylene, polybutadiene, polyimide resins, and the like.
- thermosetting resin examples include epoxy resins, benzoguanamine resins, rosin-modified maleic acid resins, rosin-modified fumaric acid resins, melamine resins, urea resins, and phenol resins.
- the photosensitive resin examples include (meth) acrylic compounds having a reactive substituent such as an isocyanate group, an aldehyde group, and an epoxy group on a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group, or an amino group, A resin obtained by reacting an acid and introducing a photocrosslinkable group such as a (meth) acryloyl group or a styryl group into the linear polymer is used.
- a reactive substituent such as an isocyanate group, an aldehyde group, and an epoxy group on a linear polymer having a reactive substituent such as a hydroxyl group, a carboxyl group, or an amino group
- a resin obtained by reacting an acid and introducing a photocrosslinkable group such as a (meth) acryloyl group or a styryl group into the linear polymer is used.
- linear polymers containing acid anhydrides such as styrene-maleic anhydride copolymer and ⁇ -olefin-maleic anhydride copolymer can be obtained from (meth) acrylic compounds having hydroxyl groups such as hydroxyalkyl (meth) acrylate. Half-esterified products are also used.
- polymerizable monomers examples include trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and ethylene oxide-modified trimethylolpropane tri (meth).
- Representative examples include various acrylic esters and methacrylic esters such as acrylate and propylene oxide-modified trimethylolpropane tri (meth) acrylate. These can be used alone or in combination of two or more, and for the purpose of maintaining appropriate photocurability, other polymerizable monomers and oligomers can be mixed and used as necessary.
- polymerizable monomers and oligomers include methyl (meth) acrylate, ethyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, cyclohexyl (meth) acrylate, ⁇ -carboxyethyl (Meth) acrylate, diethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, triethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate , Pentaerythritol tri (meth) acrylate, 1,6-hexanediol diglycidyl ether di (meth) acrylate, bisphenol A diglycidyl ether di (meth) acrylate , Neopentyl glycol diglycidyl ether di (
- a photopolymerization initiator or the like is added.
- photopolymerization initiators 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, diethoxyacetophenone, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1- Acetophenone compounds such as hydroxycyclohexyl phenyl ketone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzyl Benzoin compounds such as dimethyl ketal, benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone, acrylated benzophenone, 4-
- photopolymerization initiators can be used alone or in combination of two or more.
- the amount of the photopolymerization initiator used is preferably 0.5 to 50% by mass, more preferably 3 to 30% by mass, based on the total solid content of the colored composition.
- the coloring composition contains triethanolamine, methyldiethanolamine, triisopropanolamine, methyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, benzoic acid 2 as a sensitizer.
- sensitizers can be used alone or in combination of two or more.
- the amount of the sensitizer used is preferably 0.5 to 60% by mass, more preferably 3 to 40% by mass based on the total amount of the photopolymerization initiator and the sensitizer.
- the coloring composition can contain a polyfunctional thiol that functions as a chain transfer agent.
- the polyfunctional thiol may be a compound having two or more thiol groups. For example, hexanedithiol, decanedithiol, 1,4-butanediol bisthiopropionate, 1,4-butanediol bisthioglycolate, ethylene Glycol bisthioglycolate, ethylene glycol bisthiopropionate, trimethylolpropane tristhioglycolate, trimethylolpropane tristhiopropionate, trimethylolpropane tris (3-mercaptobutyrate), pentaerythritol tetrakisthioglycolate, Pentaerythritol tetrakisthiopropionate, tris (2-hydroxyethyl) isocyanurate trimercaptopropionate, 1,4-dimethylmercaptobenzene,
- thermal crosslinking agent examples include melamine resin and epoxy resin.
- examples of the melamine resin include alkylated melamine resins (methylated melamine resin, butylated melamine resin, etc.), mixed etherified melamine resins, and the like, which may be a high condensation type or a low condensation type.
- epoxy resin examples include glycerol / polyglycidyl ether, trimethylolpropane / polyglycidyl ether, resorcin / diglycidyl ether, neopentyl glycol / diglycidyl ether, 1,6-hexanediol / diglycidyl ether, ethylene glycol (polyethylene). Glycol) and diglycidyl ether. Any of these may be used alone or in admixture of two or more.
- the coloring composition can contain an organic solvent as necessary.
- the organic solvent include cyclohexanone, ethyl cellosolve acetate, butyl cellosolve acetate, 1-methoxy-2-propyl acetate, diethylene glycol dimethyl ether, ethylbenzene, ethylene glycol diethyl ether, xylene, ethyl cellosolve, methyl-n amyl ketone, propylene glycol monomethyl ether toluene, Examples include methyl ethyl ketone, ethyl acetate, methanol, ethanol, isopropyl alcohol, butanol, isobutyl ketone, petroleum solvent, and the like. These may be used alone or in combination.
- the photosensitive coloring composition prepared as described above is applied onto the transparent substrate and prebaked.
- Spin coating, dip coating, die coating, and the like are usually used as the means for coating, but the coating means is not limited to these as long as it can be coated with a uniform film thickness on a 40 to 60 cm square substrate.
- Prebaking is preferably performed at 50 to 120 ° C. for about 10 to 20 minutes.
- the coating film thickness is arbitrary, but considering the spectral transmittance and the like, the film thickness after pre-baking is usually about 2 ⁇ m.
- the photosensitive colored composition is applied, and the substrate on which the colored composition layer is formed is exposed through a pattern mask.
- a normal high pressure mercury lamp or the like may be used as the exposure light source.
- an alkaline aqueous solution is used as the developer.
- the alkaline aqueous solution include a sodium carbonate aqueous solution, a sodium hydrogen carbonate aqueous solution, a mixed aqueous solution of the two, or a mixture obtained by adding an appropriate surfactant to them. After development, it is washed with water and dried to obtain a pixel of any one color.
- FIG. 1 is a cross-sectional view showing a color filter according to the present embodiment.
- a black matrix 2 is provided at an inter-pixel portion located at a boundary between a pixel region and a pixel region, and colored pixels 3R, 3G, and 3B are disposed in each pixel region.
- 3R represents a red pixel
- 3G represents a green pixel
- 3B represents a blue pixel.
- An overcoat layer 4 made of a transparent resin is provided on the colored pixels 3R, 3G, and 3B.
- FIG. 2 shows a liquid crystal display device provided with the color filter shown in FIG.
- a liquid crystal display device 7 shown in FIG. 3 is a typical example of a TFT drive type liquid crystal display device for a notebook personal computer, and includes a pair of transparent substrates 8 and 9 disposed so as to be opposed to each other. Liquid crystal (LC) is enclosed.
- LC Liquid crystal
- the liquid crystal (LC) is aligned according to TN (Twisted Nematic), STN (Super Twisted Nematic), IPS (In-Plane Switching), VA (Vertical Alignment), OCB (Optical Compensating mode). .
- TN Transmission Nematic
- STN Super Twisted Nematic
- IPS In-Plane Switching
- VA Very Alignment
- OCB Optical Compensating mode
- a TFT (thin film transistor) array 10 is formed on the inner surface of the first transparent substrate 8, and a transparent electrode layer 11 made of, for example, ITO is formed thereon.
- An alignment layer 12 is provided on the transparent electrode layer 11.
- a polarizing plate 13 including a retardation film is formed on the outer surface of the transparent substrate 8.
- the color filter 14 formed using the photosensitive resin composition according to the embodiment of the present invention described above is provided on the inner surface of the second transparent substrate 9.
- a light-shielding film (not shown) having a grid pattern called a black matrix is interposed between red, green, and blue pixels constituting the color filter 14, and the color filter 14 is thus arranged for each pixel. Have been separated. Further, an overcoat layer (not shown) is provided thereon as necessary.
- a transparent electrode layer 15 made of, for example, ITO is formed on the color filter 14, and an alignment layer 16 is provided so as to cover the transparent electrode layer 15.
- a polarizing plate 17 is formed on the outer surface of the transparent substrate 9. Note that a backlight unit 19 including an LED 18 is provided below the polarizing plate 13.
- the backlight device used in this embodiment refers to a planar light source device that is disposed on the back surface of a liquid crystal panel and is used as a back light source means of a transmissive or transflective color liquid crystal display device. And a light uniformizing means for converting the light into a substantially uniform surface light source.
- the LED light source there are a light source that is a combination of three color LEDs that emit light in the red, green, and blue wavelength regions, or a white LED that is whitened by applying a green phosphor and a red phosphor to the blue LED.
- the backlight device includes an LED light source, a reflector that reflects light emitted from the light source toward the viewer, and a light-transmitting flat plate that is used as a light guide for guiding light from the light source into a planar shape. It is configured by appropriately arranging a substrate, a light control sheet on which a triangular prism array is formed, and the like.
- a light source installation method a light source is disposed directly under the back surface of the liquid crystal element (directly under method), or a light source is disposed on the side surface to transmit light using a translucent light guide such as an acrylic plate.
- a method of obtaining a surface light source by converting into a shape (side light method) is representative. For applications that require high luminance, the direct method is suitable, and for applications that require a reduction in thickness, the sidelight method is suitable.
- a red LED having a main emission wavelength in the red region out of the red, green, and blue wavelength regions is generally a GaAsP-based LED.
- examples of green LEDs having a main emission wavelength in the region include GaP-based LEDs
- examples of blue LEDs having a main emission wavelength in the blue region include InGaN-based LEDs and GaN-based LEDs.
- FIG. 3 is a characteristic diagram showing the light emission characteristics of a white light source in which red LED, green LED, and blue LED are mixed and mixed. Moreover, the characteristic view which shows the light emission characteristic of LED whitened by apply
- FIG. 5 is a characteristic diagram showing the light emission characteristics of a cold cathode fluorescent tube (hereinafter referred to as CCFL) used in a conventional liquid crystal display device.
- CCFL cold cathode fluorescent tube
- Coloring composition The following were used for the coloring agent for coloring the coloring composition used for color filter preparation.
- Red pigment C.I. I. Pigment Red 254 (“Ilgar Forred B-CF” manufactured by Ciba Specialty Chemicals), and C.I. I. Pigment Red 177 (“Chromophthal Red A2B” manufactured by Ciba Specialty Chemicals)
- Green pigment C.I. I. Pigment Green 58 (Dainippon Ink Chemical Co., Ltd. “Phthacocyanine Green A110”), C.I. I. Pigment Green 36 (“Lionol Green 6YK” manufactured by Toyo Ink Co., Ltd.), and C.I. I. Pigment Yellow 150 (Bayer's “Funcheon First Yellow Y-5688”) Blue pigment: C.I. I.
- Pigment Blue 15 (“Rionol Blue ES” manufactured by Toyo Ink Manufacturing Co., Ltd.) C.I. I. Pigment Violet 23 (“Pariogen Violet 5890" manufactured by BASF) Using each pigment, a red colored composition shown in Table 1 below, a green colored composition shown in Table 2 below, and a blue colored composition shown in Table 3 below were prepared.
- the red colored composition shown in Table 1 was applied to a glass substrate by spin coating so as to have a film thickness of 2 ⁇ m. After drying, striped pattern exposure was performed with an exposure machine, and development was performed with an alkaline developer for 90 seconds to obtain a colored layer of striped red pixels.
- the alkaline developer has the following composition.
- the blue colored composition shown in Table 3 above was also used to obtain a colored layer of blue pixels adjacent to the colored layer of red and green pixels with a film thickness of 2 ⁇ m.
- a color filter having a striped colored layer of three colors of red, green, and blue on the transparent substrate was obtained.
- the adjustment chromaticity value is based on the EBU standard value, which is a broadcast standard, but is not limited to this range.
- Examples 1 to 4 were combined with a backlight having a white light source obtained by combining a red LED, a green LED, and a blue LED.
- GA-5 to GA-8 as the green coloring composition, applying the three-color filter CF-5 to CF-8 produced by the above method and the green phosphor and red phosphor to the blue LED.
- Examples 5 to 8 were combined with backlights equipped with white LEDs.
- Comparative Examples 1 to 4 are examples in which ⁇ 9 to CF-12 are combined with a backlight including a white light source in which red LED, green LED, and blue LED are mixed and mixed.
- the three-color filters CF-13 to CF-16 prepared by the above method and the green phosphor and the red phosphor are applied to the blue LED.
- Comparative examples 5 to 8 were combined with backlights equipped with white LEDs.
- Comparative Examples 9 to 16 are examples in which a three-color filter of CF-1 to CF-8 and a backlight having a CCFL are combined.
- R-2 as a red coloring composition
- GA-9 to GA-11 as a green coloring composition
- B-2 as a blue coloring composition
- a three-color color filter CF-17 to be produced by the above method are used.
- Comparative examples 17 to 19 are examples in which CF-19 and a conventionally used cold cathode fluorescent tube (hereinafter referred to as CCFL) backlight are combined.
- CCFL cold cathode fluorescent tube
- the backlight with LED and C.I. I According to the liquid crystal display devices (Examples 1 to 8) including the pigment green 58 and including the color filter including the green coloring layer having a dielectric loss tangent of 0.01 or less, the NTSC ratio is 70% or more and color reproduction is achieved. The property was good. In addition, the dielectric loss tangent of the green colored layer was less than 0.01, and good display quality was obtained without causing poor liquid crystal alignment of the pixel and threshold voltage shift of the driving voltage.
- C.I. I According to a liquid crystal display device (Comparative Examples 17 to 19) using a color filter including a green color layer having a dielectric loss tangent exceeding 0.01 even though it includes the pigment green 58 and a backlight including a CCFL, the liquid crystal alignment of the pixels An image burn-in phenomenon due to a failure or a threshold shift of the driving voltage occurred, and good display characteristics could not be obtained.
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Abstract
Description
カラーフィルタ基板に用いられる透明基板は、可視光に対してある程度の透過率を有するものが好ましく、より好ましくは80%以上の光透過率を有するものを用いることができる。一般に、液晶表示装置に用いられているものでよく、PETなどのプラスチック基板やガラスが挙げられるが、通常はガラス基板を用いるとよい。ブラックマトリックスと称する遮光パターンを用いる場合は、あらかじめ透明基板上にクロム等の金属薄膜や遮光性樹脂による格子状パターンを公知の方法で形成したものを用い、一画素ごとの仕切りとすればよい。
ジルエーテルジ(メタ)アクリレート、ネオペンチルグリコールジグリシジルエーテルジ(メタ)アクリレート、ジペンタエリスリトールヘキサ(メタ)アクリレート、トリシクロデカニル(メタ)アクリレート、エステルアクリレート、メチロール化メラミンの(メタ)アクリル酸エステル、エポキシ(メタ)アクリレート、ウレタンアクリレート等の各種アクリル酸エステルおよびメタクリル酸エステル、(メタ)アクリル酸、スチレン、酢酸ビニル、ヒドロキシエチルビニルエーテル、エチレングリコールジビニルエーテル、ペンタエリスリトールトリビニルエーテル、(メタ)アクリルアミド、N-ヒドロキシメチル(メタ)アクリルアミド、N-ビニルホルムアミド、アクリロニトリル等が挙げられる。これらについても、単独でまたは2種類以上混合して用いることができる。
以下に、実施例により本発明を具体的に説明するが、本発明の趣旨を逸脱しない範囲においてこれに限定されるものではない。
本実施例で用いるバックライト装置は、液晶パネルの背面に配置され、透過型又は半透過型のカラー液晶表示装置の背面光源手段として用いられる面状光源装置を指し、LED光源と、この光源光をほぼ均一な面光源に変換する光均一化手段とを具備するものである。LED光源としては、赤、緑、青の波長域に発光する3色のLEDの組合せに係るもの、または青色LEDに緑色蛍光体及び赤色蛍光体を塗布することで白色化したものがある。
カラーフィルタ作製に用いる着色組成物を着色するための着色剤には以下のものを使用した。
緑色用顔料:C.I.Pigment Green 58(大日本インキ化学工業(株)「Phthalocyanine Green A110」)、C.I.Pigment Green 36(東洋インキ製造(株)製「リオノールグリーン 6YK」)、およびC.I.Pigment Yellow 150(バイエル社製「ファンチョンファーストイエロー Y-5688」)
青色用顔料:C.I.Pigment Blue 15(東洋インキ製造(株)製「リオノールブルーES」)C.I.Pigment Violet 23(BASF社製「パリオゲンバイオレット 5890」)
それぞれの顔料を用いて、下記表1に示す赤色着色組成物、下記表2に示す緑色着色組成物、下記表3に示す青色着色組成物を作製した。
得られた着色組成物を用いてカラーフィルタを作製した。
炭酸水素ナトリウム 0.5重量%
陰イオン系界面活性剤 8.0重量%
(花王(株)製「ペリレックスNBL」)
水 90重量%
次に、上記表2の緑色着色組成物も同様にスピンコートにて膜厚が2μmとなるように塗布した。乾燥した後、露光機にてストライプ状の着色層を前述の赤色画素の着色層とはずらした場所に露光し、現像することで、前述の赤色画素の着色層と隣接した緑色画素の着色層を得た。
Claims (7)
- LEDを備えるバックライトと、緑色着色層を含む複数色の着色層を備えるカラーフィルタとを具備する液晶表示装置において、前記カラーフィルタの緑色着色層が、臭素化亜鉛フタロシアニン緑色顔料を含み、前記緑色着色層の、液晶表示装置の駆動周波数における誘電正接が0.02以下である液晶表示装置。
- LEDを備えるバックライトと、少なくとも緑色着色層を含む複数色の着色層及び透明樹脂からなるオーバーコート層を備えるカラーフィルタとを具備する液晶表示装置において、前記カラーフィルタの緑色着色層が、臭素化亜鉛フタロシアニン緑色顔料を含み、緑色着色層とオーバーコート層の積層の、液晶表示装置の駆動周波数における誘電正接が0.02以下である液晶表示装置。
- 前記カラーフィルタの緑色着色層を構成する着色材料の含有量が前記緑色着色層に対する重量比率で30%以下であり、前記LEDバックライトからの光を通した際の前記緑色着色層の色度が、XYZ表色系において、yが0.60以上であり、xy色度におけるカラーフィルタとしての色再現域がNTSC比で70%以上である請求項1又は2に記載の液晶表示装置。
- 前記バックライトは、赤色LED、緑色LED、及び青色LEDを備える請求項1又は2に記載の液晶表示装置。
- 前記バックライトは、青色LEDと緑色蛍光体及び赤色蛍光体との組合せからなる白色LED装置を備える請求項1又は2に記載の液晶表示装置。
- 請求項1又は2に記載の液晶表示装置用のカラーフィルタであって、前記緑色着色層が、臭素化亜鉛フタロシアニンからなる緑色顔料と黄色顔料を含み、顔料全重量に対する緑色顔料の重量比率が70%以下であり、前記緑色着色層に対する顔料の重量比率が30%以下である液晶表示装置用カラーフィルタ。
- 請求項1又は2に記載の液晶表示装置用のカラーフィルタであって、前記緑色着色層が、C.I.ピグメントグリーン58からなる緑色顔料と、C.I.ピグメントイエロー185、C.I.ピグメントイエロー150、C.I.ピグメントイエロー139、及びC.I.ピグメントイエロー138からなる群から選ばれる1種以上の黄色顔料とを含み、顔料全量に対するC.I.ピグメントグリーン58の重量比率が70%以下であり、前記緑色着色層に対する顔料の重量比率が30%以下である液晶表示装置用カラーフィルタ。
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KR1020097026966A KR101501791B1 (ko) | 2008-01-07 | 2008-12-19 | 액정 표시 장치 및 액정 표시 장치용 컬러 필터 |
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JP2011084726A (ja) * | 2009-09-18 | 2011-04-28 | Fujifilm Corp | 着色硬化性組成物、カラーフィルタ、及びカラーフィルタの製造方法 |
EP2478413A4 (en) * | 2009-09-18 | 2013-06-26 | Fujifilm Corp | DYED HARDENING COMPOSITION, COLOR FILTER AND METHOD FOR PRODUCING A COLOR FILTER |
US8741509B2 (en) | 2009-09-18 | 2014-06-03 | Fujifilm Corporation | Colored curable composition, color filter, and method for producing color filter |
Also Published As
Publication number | Publication date |
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KR20100103343A (ko) | 2010-09-27 |
CN101688992A (zh) | 2010-03-31 |
CN101688992B (zh) | 2012-09-26 |
JP2009163014A (ja) | 2009-07-23 |
TW200934834A (en) | 2009-08-16 |
TWI445774B (zh) | 2014-07-21 |
US20100271569A1 (en) | 2010-10-28 |
US8269921B2 (en) | 2012-09-18 |
KR101501791B1 (ko) | 2015-03-11 |
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