JP4449100B2 - Color filter for display device and method for manufacturing display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color filter for a display device such as a field emission display device, a fluorescent display device, a plasma display (PDP), and a liquid crystal display device, and a display device, and particularly a display excellent in heat resistance, transparency, and strength. The present invention relates to a color filter for a device and a display device.
[0002]
[Prior art]
Color filters are used in display devices for purposes such as color display, reflectance reduction, contrast improvement, and spectral characteristic control, and are effective means.
[0003]
When a dye is used as the coloring substance, a color filter with very high transparency can be obtained, but there is a drawback that the heat resistance is poor.
[0004]
As types with improved heat resistance, those using organic or inorganic pigments as coloring substances and those using heat-resistant dyes have been developed.
[0005]
However, since the color filter used in the liquid crystal display device has a heat resistance of about 200 to 250 ° C., an organic pigment or a heat-resistant dye can be used. The heat resistance of the color filter used in the display (PDP) is said to be 400 ° C. or higher, and the heat resistance of the organic pigment or heat resistant dye is insufficient.
[0006]
Therefore, generally, an inorganic pigment is used as a coloring substance. However, although the inorganic pigment has sufficient heat resistance, it has a problem of poor colorability, sharpness and transparency.
[0007]
Further, when an inorganic pigment is used, it has a disadvantage that the strength is slightly inferior.
[0008]
[Problems to be solved by the invention]
The present invention is particularly suitable for display devices such as field emission display devices, fluorescent display devices, and plasma displays (PDPs), and has colorability and transparency comparable to a color filter using a dye, and is heat resistant. Another object of the present invention is to provide a color filter for a display device and a display device that are excellent in strength.
[0009]
[Means for Solving the Problems]
The present invention has been made to achieve the above object,
According to the first aspect of the present invention, at least each colored layer of red, green, and blue is provided on a transparent substrate, and each colored layer is composed of a vitreous material in which a colloid of a metal or a metal compound is dispersed. In a method for producing a color filter for a display device having a particle diameter of 1 to 100 nm, a glassy substance forming solution and a metal or metal compound colloid or a complex that is a precursor of a metal or metal compound colloid are included. a step of applying the solution to the colored layer located on the substrate, the coating solution possess a step of drying each coloring layer of each color, forming a glassy layer containing dispersed colloidal heated, the , in the step of drying each colored layer of each color, the manufacturing method der a color filter for a display device, characterized in that the composition or drying temperature of the solution is different for each coloring layer .
The invention according to claim 2 is characterized in that the vitreous substance-forming solution comprises (A) at least one hydrolyzable silane or oligomer derived therefrom, and (B) at least one organosilane or derivative derived therefrom. The weight ratio of (A) :( B) is from 5 to 50:50 to 95, and further includes (C) one or more compounds containing a glass-forming element as necessary. The method for producing a color filter for a display device according to claim 1.
According to a third aspect of the present invention, the colloidal gold is dispersed in the vitreous material in the red and blue colored layers, and the colloidal gold and silver is dispersed in the vitreous material in the green colored layer. The method for producing a color filter for a display device according to claim 1, wherein the color filter is for display devices.
According to a fourth aspect of the present invention, there is provided a display device characterized in that a transparent conductive film is provided on the entire surface of the color filter for a display device according to any one of the first to third aspects to form a front plate for the display device.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a color filter for a display device according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view showing an embodiment of a color filter for a display device according to the present invention. As shown in FIG. 1, a color filter 1 for a display device has a red (R), green (G), and blue (B) colored layer 3 on a transparent substrate 2 in a pixel shape such as a stripe shape or a mosaic shape. Is formed. A protective layer 5 is provided on the base layer 4 and the colored layer 3 between the transparent substrate 2 and the colored layer 3 as necessary.
[0011]
In FIG. 1, the transparent substrate 2 used in the present invention preferably has sufficient strength, flatness, heat resistance, light transmittance, etc., and usually transparent glass is used.
[0012]
Moreover, in FIG. 1, the colored layer 3 is comprised with the colloid of a metal or a metal compound, and a glassy substance.
[0013]
As the metal colloid, those of Ag, Cu, Au, Pd, and Pt are particularly suitable. These usually have a particle diameter of 1 to 100 nm, 1 to 20 nm in the case of a transparent layer, and 20 to 100 nm in the case of a light scattering layer.
[0014]
Examples of suitable metal compounds colloidal form a metal halide, for example _{AgCl, AgBr, AgCl X Br 1} -X, and CuCl, metal carbide, for example, TiC and B ₄ C, metal nitrides, e.g., BN and TiN Metal arsenides such as Cd ₃ As ₂ , metal phosphides such as Cd ₃ P ₂ , chalcogenides (sulfides, selenides, tellurides) such as AgS, CdS, HgS, PbS, and ZnS; CdSe, ZnSe, CdTe, and mixed phases, such as ZnSe / PbS ₂ or CdS / PbS ₂ .
[0015]
The metal or metal compound colloid preferably has a particle size of 1 to 100 nm, in particular 1 to 50 nm, more preferably 2 to 30 nm.
[0016]
The amount of metal or metal compound colloid is determined by the desired properties of the color filter, such as coloration or transparency. Moreover, the colloid of a metal or a metal compound can be used in the form complexed beforehand as needed.
[0017]
Examples of the glassy substance in the silane (A) and organosilane (B) that can be hydrolyzed include hydrogen or halogen (F, Cl, Br or I), alkoxy (preferably, for example, , Methoxy, ethoxy, n-propoxy, C _1-6 alkoxy like i-propoxy and butoxy), aryloxy (preferably C _6-10 aryloxy like phenoxy), acyloxy (preferably acetoxy or propionyl) C _1-6 acyloxy such as oxy), alkylcarbonyl (preferably C _2-7 alkylcarbonyl such as acetyl), amino, monoalkylamino having 1 to 12, especially 1 to 6 carbon atoms, or Dialkylamino.
[0018]
Organosilanes have radicals that are not hydrolyzed, radicals that have functional groups, and groups that can be hydrolyzed, and examples of radicals that are not hydrolysable are alkyl (preferably methyl, ethyl, n-propyl, isopropyl, n C _1-6 alkyl such as -butyl, sec-butyl, and t-butylpentyl, hexyl or cyclohexyl), alkenyl (preferably C _2-6 alkenyl such as vinyl, 1-propenyl, 2-propenyl and butenyl) ), Alkynyl (preferably C _2-6 alkynyl such as acetylenyl and propargyl), and aryl (preferably C _6-10 aryl such as phenyl and naphthyl).
[0019]
The non-hydrolyzed radical and hydrolyzable group may have one or more commonly used substituents such as halogen or alkoxy, if necessary.
[0020]
Specific examples of the functional group of the radical having a functional group are epoxy, hydroxy, ether, amino, monoalkylamino, dialkylamino, amide, carboxy, mercapto, thioether, vinyl, acrylicoxy, methacryloxy, cyano, halogen, Aldehyde, alkylcarbonyl, sulfonic acid and phosphoric acid groups.
[0021]
The functional group may be bonded to a silicon atom via an alkylene, alkenylene or arylene bridging group, and the bridging group may intervene with an oxygen or sulfur atom or an —NH— group. The bridging group is derived from the alkyl, alkenyl or aryl radicals described above. The radical having a functional group preferably contains 1 to 18, particularly preferably 1 to 8 carbon atoms.
[0022]
Particularly preferred hydrolyzable silanes (A) are tetraalkoxysilanes such as tetraethoxysilane (TEOS). Particularly preferred organosilanes are epoxy silanes such as 3-glycidyloxypropyl-trimethoxysilane (GPTS) and aminosilanes such as 3-aminopropyl-triethoxysilane and 3- (aminoethylamino) -propyl- Triethoxysilane (DIAMO).
[0023]
The weight ratio of hydrolyzed silane (A) to organosilane (B) is 5-50: 50-95, preferably 15-25: 75-85.
[0024]
The one or more compounds (C) containing a glass-forming element are preferably soluble or dispersible in the reaction medium. Examples of usable compounds (halides, alkoxides, carboxylates, chelate compounds, etc.) are lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, boron, aluminum, titanium, zirconium , Tin, zinc or vanadium.
[0025]
Hydrolysis and polycondensation is carried out in the absence of a solvent or preferably in an aqueous or aqueous / organic reaction medium, optionally with an acidic or basic condensation catalyst such as HCl, HNO ₃ or NH ₃ . Done in the presence.
[0026]
If a liquid reaction medium is used, the starting components are soluble in the reaction medium. Suitable organic solvents are in particular water-miscible solvents such as mono- or polyhydric aliphatic alcohols, ethers, esters, ketones, amides, sulfoxides and sulfones.
[0027]
If necessary, hydrolysis and polycondensation are performed in the presence of a complexing agent.
[0028]
A vitreous material containing a metal or metal compound colloid is used after the viscosity is adjusted by adding or removing a solvent, if necessary.
[0029]
As a method of forming a colored layer of a color filter with a glassy material in which a colloid of a metal or a metal compound is dispersed, the above-described liquid is used as it is when a printing method or an inkjet method is used. When used, it is used by mixing a photosensitive substance in the above-mentioned solution. However, the method for forming the colored layer of the color filter is not limited to these.
[0030]
The formed colored layer is dried as necessary, and then densified with heat to form a vitreous layer. Densification is performed at a temperature of 250 ° C. or higher, preferably 400 ° C. or higher, particularly preferably 500 ° C. or higher, up to the softening or decomposition temperature of the support. Densification by heat is performed in air or in an inert gas such as nitrogen or argon.
[0031]
Furthermore, you may form the protective layer 5 on the colored layer 3 as needed.
[0032]
In the color filter according to the present invention, a colored layer is formed of a vitreous material in which a colloid of a metal or a metal compound is dispersed. Metal or metal compound colloids have a very small particle size, so they are very evenly dispersed in the glassy material, and if a colloid of the appropriate particle size is used, it has the effect of transmission (transparency) or light scattering Can color white light. Furthermore, the metal or metal compound colloid is heat resistant. In addition, the vitreous substance can be coated on a substrate (usually glass) in a very uniform state and in a close contact state, and does not cause cracking in the case of densification by heat. Excellent transparency.
[0033]
【Example】
Hereinafter, specific examples of the present invention will be given and described in detail.
A color filter for display in which a colored layer of striped pixels having a width of about 200 microns is formed on a transparent substrate in which a stripe-shaped black matrix layer having a line width of 20 microns and an opening width of 200 microns is formed in advance. A display device using this was manufactured.
[0034]
(Preparation of glassy material)
160 g of 3-glycidyloxypropyltrimethoxysilane (GPTS) and 40 g of tetraethoxysilane (TEOS) were mixed with 120 ml of ethanol and heated to 60 ° C. with stirring. To this was added 28.5 g of water and 0.5 ml of concentrated HNO3, and the mixture was stirred at 60 ° C. for 15 hours and then diluted with 150 ml of ethanol. The liquid thus obtained is designated as a liquid (A) for forming a vitreous substance.
[0035]
(Preparation of coating solution for colored layer)
To a solution of 0.31 g of H [AuCl ₄ ] -2H ₂ O dissolved in ₄ ml of ethanol, 0.18 g of 3- (aminoethylamino) -propyl-triethoxysilane (DIAMO) dissolved in 1 ml of ethanol was added dropwise ( Liquid (B)). The liquid (B) was added dropwise to the liquid (A) mixed with 1.58 ml of DIAMO. The resulting solution was stirred for 30 minutes and then filtered through a 0.8 micron filter to obtain a colored layer coating solution (1).
[0036]
Next, a solution obtained by dissolving 0.51 g of AgNO _{3 in} 3.3 ml of DIAMO and 3 ml of ethanol is mixed in 20 ml of the liquid (A), stirred for 30 minutes, filtered through a 0.8 micron filter, and coated for a colored layer. A liquid (2) was obtained.
[0037]
(Production of color filter)
Red (R), green (G), and blue (B) colored layers were formed by screen printing at predetermined positions on a transparent substrate on which a black matrix layer was previously formed.
[0038]
The red (R) layer was prepared by coating the colored layer coating solution (1), drying at 80 ° C., and densifying at 500 ° C.
The green (G) layer was prepared by mixing the coating liquids (1) and (2) for the colored layer in a weight ratio of 3: 1, coating, drying at 150 ° C., and densifying at 500 ° C. .
The blue (B) layer was prepared by coating the colored layer coating liquid (1), drying at 150 ° C., and further densifying at 500 ° C.
[0039]
(Production of display device)
A transparent conductive film was provided on the entire surface of the color filter, and a protective layer was further provided to produce a front substrate for a display device (PDP).
[0040]
Separately from the front substrate for display device (PDP), a rear substrate for display device (PDP) having a desired electrode pattern on the substrate, a phosphor layer coated with phosphor in the partition walls, and the like was prepared.
[0041]
Next, an inert gas was sealed between the front substrate and the rear substrate for the display device (PDP) to produce a display device (PDP).
The display quality of this display device was good.
[0042]
【The invention's effect】
In the color filter for a display device of the present invention, the colored layer is composed of a colloid of a metal or a metal compound and a vitreous substance, and the vitreous substance containing the metal or the metal compound is a colored substance having a very small particle diameter. Moreover, since it is coated in a very uniform state and cracking does not occur in the case of densification by heat, the optical properties of the colored layer, particularly transparency, are very excellent.
Moreover, since a colored layer is formed with glassy, it is excellent in heat resistance and intensity | strength, and is excellent in adhesiveness with the transparent substrate normally consisting of glass.
Therefore, a display device using this color filter is also excellent in optical characteristics, heat resistance, strength, and adhesion.
[0043]
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a color filter for a display device according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Color filter for display apparatuses 2 Transparent substrate 3 Colored layer 4 Underlayer 5 Protective layer

Claims (4)

At least red, green, and blue colored layers are provided on a transparent substrate, and each colored layer is composed of a vitreous material in which a colloid of a metal or a metal compound is dispersed, and the particle diameter of the colloid is 1 to 100 nm. In a method for producing a color filter for a display device, a solution containing a glassy substance forming solution and a metal or a colloid of a metal compound or a complex that is a precursor of a colloid of a metal or a metal compound is placed at a colored layer position on a substrate. a step of applying, and drying the coating solution for each color layer of each color, heating to possess a step of forming a glassy layer containing dispersed colloidal, and dried for each color layer of each color The manufacturing method of the color filter for display apparatuses characterized by the composition or drying temperature of a solution differing for every said colored layer in the process to do.   The vitreous material-forming solution is (A) at least one hydrolyzable silane or oligomer derived therefrom, and (B) at least one organosilane or oligomer derived therefrom (A) :( 2. The display device according to claim 1, wherein the weight ratio of B) is 5 to 50:50 to 95, and further includes (C) one or more compounds containing a glass-forming element as required. A method for producing a color filter.   The colloidal gold is dispersed in a vitreous material in the red and blue colored layers, and the colloidal gold and silver is dispersed in the vitreous material in the green colored layer. Or the manufacturing method of the color filter for display apparatuses of 2.   A display device comprising a transparent conductive film provided on the entire surface of the color filter for a display device according to claim 1 to form a front plate for the display device.

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