JP2000214322A - Method for adjusting color temperature, color temperature adjusting filter using the same and filter for plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a adjusting method for elevating a color temperature by using an optical filter and a filter for a display with high transmittance of light in the visible region, with a high color temperature and with excellent color reproducibility. SOLUTION: The method for adjusting a color temperature comprises adjusting transmittance in the visible ray region by transmitting light through a pigment layer which contains at least one or more kinds of organic pigments, and the method for adjusting the color temperature makes the color temperature after transmission through the pigment layer using the C light source described in JIS Z 8720 be >=1.2 times higher than color temperature before transmission through the pigment layer, in the case absorbance of the pigment layer in 380-780 nm visible ray region at the maximum absorption wavelength is 0.2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for greatly improving color temperature, and more particularly to a color temperature adjusting filter, and more particularly to a display filter having a function of improving color reproducibility by improving color temperature. is there.

[0002]

2. Description of the Related Art In recent years, thin and flat displays such as a liquid crystal display, a plasma display panel, and a field emission display panel have been commercialized as display panels of various electronic devices such as a monitor of a personal computer and a wall-mounted television. In particular, the demand for plasma display panels is increasing, and it is expected that the number will increase further in the future. However, these displays have a problem in that the color temperature of the backlight and the illuminant is low, and the color reproduction range is significantly narrowed.
That is, when the color temperature is low, the display screen itself has a yellowish or reddish tint, and there is a disadvantage that the screen lacks vividness. For this reason, various efforts have been made to improve the color temperature of the light source, including increasing the color temperature. However, there are still many displays that are still insufficient.

On the other hand, since a plasma display emits near-infrared light, there is a fear that a malfunction may occur if equipment using near-infrared light is present nearby. Devices that use near-infrared light, such as cordless horns or remote control devices, are being developed in various fields of automatic control technology, such as driving robots. The accuracy is being improved. Along with this, troubles due to malfunctions of information detection devices, reading devices and other various instruments due to near-infrared light invading from other places including other devices also increase, and in the field of medicine etc. Your life is at stake. Therefore, in order to cut off near infrared rays emitted from the plasma display panel, many near infrared absorbing dyes and filters using the same have been developed. (JP-A-5-4262
2, 6-118228, JP-A-9-230134, JP-A-9-145919, JP-A-9-330612, JP-A-10-78509, JP-A-10-105076, and JP-A-10-153964. However, these suppress the transmittance in the near-infrared light region and reduce the transmittance in the visible light region to, for example, 5%.
It is a filter that secures 0% or more and is effective in cutting near infrared rays, but as a filter for display, it focuses only on the brightness of the screen and does not consider color reproducibility .

In a plasma display, a phosphor is made to emit light. By cutting off light of an extra wavelength of the emitted color, the emitted color is corrected to improve color reproducibility (Japanese Patent Application Laid-Open No.
145918) and a method of individually defining the transmittance of light in the red, green and blue wavelength bands to enhance the image contrast and improve the color purity (Japanese Patent Laid-Open No. 10-128988).
Japanese Patent Application Laid-Open Publication No. H10-176, etc.) have been proposed to improve color reproducibility.

On the other hand, since the infrared dye to be added itself is colored, a method of toning for the purpose of improving the coloring (green, yellow-green) by adding the infrared dye (Japanese Patent Laid-Open No. 11-199683).
Publication). However, the purpose is merely to improve the coloring by the infrared dye, and the color temperature at the time of transmission through the C light source in the embodiment is as low as about 7400 K, the improvement rate of the color temperature is only about 1.1 times, and the improvement of the color temperature is achieved. The problem has not been fully solved.

[0006] Further, WO 98/23980 discloses an absorption filter containing a plurality of dyes in order to eliminate unnecessary light sources between light-emitting sources (R, G, B) of a display. It does not adjust the intensity ratio of the dyes, does not describe the improvement of the color temperature, and even more, the addition of a plurality of dyes having absorption between the light-emitting light sources (R, G, B) as described above does not Of the light source (R, G, B) itself decreases the transmittance of the filter itself over the entire visible light range (the average transmittance of 400 to 500 nm is also large). The screen as a plasma display becomes dark, which is not preferable.

Until now, plasma displays and FEDs
As a method for improving the color temperature in a display that emits light from a phosphor such as a light source, attempts have been made exclusively to improve the light emitting body and the light emitting process, and to devise a filter provided on the plasma display. Thus, there has been no known method capable of easily increasing the color temperature without improving the luminous body itself.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an adjustment method for increasing a color temperature by using an optical filter, a method for increasing a visible light transmittance and a color temperature. It is an object of the present invention to provide a display filter having high color reproducibility. And
In particular, an object of the present invention is to provide a filter for a plasma display panel having a high visible light transmittance and a high color temperature and good color reproducibility.

[0009]

Means for Solving the Problems The present inventors have intensively studied the transmission spectrum of the filter and the dye to be used in order to develop a method for adjusting the color temperature of the light source to a higher color temperature using the filter. The present inventors have found that the object can be achieved by adjusting the transmission spectrum of the filter using a dye having a specific absorption spectrum, and arrived at the present invention.

That is, a first gist of the present invention is a color temperature adjusting method for adjusting the transmittance in the visible light region by transmitting an organic dye through a dye layer containing at least one kind of the organic dye. When the absorbance at the maximum absorption wavelength in the visible light range of 380 to 780 nm is 0.2, JIS Z
87. A color temperature adjusting method characterized in that the color temperature when transmitted through the dye layer using the C light source described in 8720 is 1.2 times or more the color temperature before transmission through the dye layer. ,
Exists.

[0011] The second aspect of the present invention is to provide an organic dye.
Permeating a dye layer containing at least one or more dyes
Color temperature adjustment method that adjusts the transmittance in the visible light range
The absorption of 450 nm and 600 nm in the dye layer.
Luminous intensity A ratio (A_450nm/ A_{60 0nm}) Is 0.5 or less
And the average transmittance at 400 nm to 500 nm is
Color temperature adjustment method characterized by being 50% or more
Exist.

A third aspect of the present invention is a color temperature adjusting method for adjusting the transmittance in the visible light region by transmitting an organic dye through a dye layer containing at least one or more organic dyes. By blending an infrared-absorbing dye or adding an infrared-absorbing dye to a layer different from the dye layer, the dye layer has an average transmittance of 10% or less for light having a wavelength of 800 nm to 1000 nm, and , At least the ratio of the absorbance A at a wavelength of 450 nm to 600 nm (A _{450 nm} / A
_{600 nm} ) is 1.0 or less, and 400 _{nm to} 500 n
m, wherein the average transmittance at m is 50% or more.

Still another aspect of the present invention resides in a color temperature adjustment filter and a plasma display panel filter using the above color temperature adjustment method. Hereinafter, the present invention will be described. The C color light source, which is a standard light source, is used for “color specification” in the text. The C light source is a light source that is widely used as “standard light” representing “general hue”, and is a light source adjusted to have a spectral distribution defined by JIS Z8702. About 67
74K standard light. In addition, the color temperature of the present invention is calculated using “color optics” (Noboru Ota, Tokyo Denki University Press, 1
(993), p. 110, a method for calculating the correlated color temperature of the light source by the following McCamy equation can be applied.

[0014]

[Number 1] color temperature T = -437n ³ + 3601n ² -68
61n + 5514.31 where n = (x−0.3320) / (y−0.185
8) The method of calculating the chromaticity coordinates x, y is described in JIS Z8701, and is calculated from tristimulus values X, Y, Z by the following equation.

[0015]

X = X / (X + Y + Z) y = Y / (X + Y + Z)

If the light color of the light source matches the light color of the reference black body, the temperature of the black body at that time is defined as the color temperature. If the light color does not completely match, the temperature of the closest black body is determined. Defined as correlated color temperature. In the present invention, the term “color temperature” includes a correlated color temperature unless otherwise specified.

As a result of intensive studies by the present inventors, it has been found that the absorption of the maximum absorption wavelength in the visible light region of 380 to 780 nm of the dye layer is 0.2 by adding an organic dye to the dye layer of the filter. Time, JIS Z8720
It has been found that the color temperature when transmitted through the dye layer using the C light source described in (1) can be 1.2 times or more the color temperature before transmission through the dye layer.

In order to increase the color temperature as defined in the present invention, x and y may be reduced. For this purpose, the tristimulus value "Z" is used as the transmission spectrum of the filter.
The color temperature can be increased most efficiently by increasing the transmittance in the main wavelength range of 400 to 500 nm, and decreasing the transmittance in the main wavelength range of the tristimulus value "X" of 500 to 700 nm. It becomes.

That is, to increase the transmittance in the main wavelength range of the tristimulus value "Z" of 400 to 500 nm,
It is preferable that the absorption is small in the range of 400 nm to 500 nm, that is, the transmittance is 50% or more. Then, the main wavelength range of the tristimulus value “X” is 500 nm to 700 n.
To lower the transmittance at m, a dye having a large absorption in this wavelength region was found to be the most suitable dye, and such a dye having a central wavelength of 600, which is the center wavelength of the tristimulus value “X”, was found.
450 which is the central wavelength of the absorbance in nm and the tristimulus value "Z".
It was found that a dye having an absorbance ratio in _nm ( _A450nm / _A600nm ) of 0.5 or less, preferably 0.3 or less, was preferable. The main wavelength range is 500 nm to 630 nm.
With respect to the tristimulus value “Y”, the contribution to the improvement of the color temperature was smaller than that of the above X and Z.

From these findings, it was found that 45
Ratio of absorbance A between 0 nm and 600 nm (A _{450 nm} / A
_{600 nm} ) is 0.5 or less, and 400 _{nm to} 500
By blending the organic dye so that the average transmittance at 50 nm is 50% or more, the color temperature of the C light source is at least 1.2 times or more, and the dye is optimized.
It is possible to obtain a vivid screen without yellow or reddish on the display screen, and to obtain an excellent color temperature adjustment filter with a wide color reproducibility range. It has become possible.

However, although the color temperature can be increased by adding a large amount of the dye, the transmittance of the filter itself is decreased. Therefore, it is considered that the transmittance at 600 nm is preferably at least 20%. By limiting the addition amount so that the transmittance at 600 nm is preferably 20% or more, more preferably 50% or more, a filter having a high transmittance and a high color temperature can be obtained.

In many dyes, the absorption in the ultraviolet region is visible.
Since it extends to the light part and causes the transmittance to decrease,
The ratio of the absorbance A between 400 nm and 600 nm (A_400nm/ A
_{600n m}) Is 1.0 or less.
Filter with excellent transmittance and excellent color reproducibility
Obtainable. Dye added together before 600nm
It is necessary to absorb the later light more efficiently,
It is desirable that the dye layer itself has a large absorption at 600 nm.
Or A_{60 0nm}/ Aλ_maxnmIs 0.5 or more
The color temperature efficiently by adjusting the colorant layer
Can be

In this case, the visible light range is 380 nm to 780 n.
By adjusting the dye concentration so that the average transmittance of m is 50% or more, preferably 70% or more, a filter having excellent transmittance can be obtained. A good filter can be obtained without impairing brightness. The dye used for adjusting the color temperature of the present invention may be a single organic dye, but the number of organic dyes satisfying the required conditions is small, so that a composition satisfying the above characteristics by appropriately combining two or more kinds of organic dyes is used. Is also good.

A filter for a light source that emits near-infrared light, such as a plasma display, blocks light in the near-infrared light section in order to eliminate malfunction of peripheral devices such as remote controllers due to near-infrared light. It is necessary to
Further, by blending a near-infrared light absorbing dye, an excellent color temperature adjustment filter free from malfunction due to near-infrared light can be obtained.

In this case, the infrared absorbing dye may be blended in the dye layer or in a layer different from the dye layer.
10% average transmittance for light from 0 nm to 1000 nm
By selecting and blending an infrared dye having an infrared absorption performance as described below, by selecting and blending a dye having as little absorption as possible around 400 nm among the infrared dyes,
A filter that has a high visible light transmittance, a high color temperature, and can efficiently block infrared light can be obtained. This is because some of the infrared dyes have absorption around 400 nm, and if the absorption around 400 nm is large,
Since the transmittance of the filter itself is lowered, it is preferable to select an infrared dye that absorbs as little as possible around 400 nm, that is, the ratio of the absorbance A at a wavelength of 450 nm to 600 nm (A _{450 nm} / A _{600 nm} ) 1.0 or less, and the ratio (A400nm / A600nm) of the absorbance A between 400 nm and 600 _nm is 2.0 or less, and the average transmittance at _{400 nm} to 500 _nm is 50% or more. It is preferable to select an infrared dye so as to form a suitable dye layer.

Even when an infrared absorbing dye is blended or laminated, the transmittance of the dye layer at a wavelength of 600 nm is 20%.
%, A filter having a high color temperature and a high transmittance can be obtained. Further, the ratio of the absorbance A at a wavelength of 400 nm to 600 nm (A
_{(400 nm} / _{A600 nm} ) is preferably adjusted to 2.0 or less. Further, the filter for a plasma display panel may be provided with an electromagnetic wave cut layer, an antireflection layer for preventing reflection of external light such as a fluorescent lamp on the surface, and an anti-glare (non-glare) layer, if necessary.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION The dye for adjusting the color temperature used in the method of the present invention has a low absorption in the main wavelength range of the tristimulus value "Z" of 400 nm to 500 nm and a tristimulus value "X". 500 nm to 700 which is the main wavelength range of
Any dye having a large absorption in nm can be used without particular limitation. Examples of such dyes include anthraquinone-based compounds, phthalocyanine-based compounds, azo-based compounds, squarylium-based compounds, and indigo-based compounds.

The near-infrared absorbing dye is not particularly limited. For example, organic substances such as cyanine compounds, squarylium compounds, thiol nickel complex compounds, phthalocyanine compounds, porphyrin compounds, triallylmethane Compounds, immonium salt compounds, diimmonium salt compounds, naphthoquinone compounds, anthraquinone compounds, aminium salt compounds,
Alternatively, an inorganic substance such as indium tin oxide, antimony tin oxide, an oxide, a carbide, or a boride of a metal belonging to Groups 4A, 5A, or 6A of the periodic table may be used.

The color temperature adjusting filter of the present invention is manufactured by using a dye layer containing an organic dye for adjusting the color temperature, or by adding a near-infrared absorbing dye and forming it on a transparent substrate. You. The transparent substrate constituting the color temperature adjustment filter is substantially transparent,
Any substrate may be used as long as it does not cause large scattering, and there is no particular limitation.
Specific examples thereof include glass and a transparent resin. As the transparent resin, a polyolefin resin,
Amorphous polyolefin resin, polyester resin, polycarbonate resin, poly (meth) acrylate resin, polystyrene resin, polyvinyl chloride resin, polyvinyl acetate resin, polyarylate resin, polyether sulfone resin, etc. Can be. Among these,
Particularly, an amorphous polyolefin resin, a polyester resin, a polycarbonate resin, a poly (meth) acrylate resin, a polyarylate resin, and a polyether sulfone resin are preferable. These resins include generally known additives such as phenol-based, phosphorus-based antioxidants, halogen-based, phosphoric acid-based flame retardants, heat-resistant anti-aging agents, ultraviolet absorbers, lubricants, and antistatic agents. Agents and the like can be blended.

These resins are formed into a film or sheet (plate) by a known method such as injection molding, T-die molding, calender molding, compression molding, or the like, or by dissolving in an organic solvent and casting. Served as The thickness is 10 μm to 5 mm depending on the purpose.
Is desirable. The base material constituting such a transparent substrate,
It may be unstretched or stretched, and may be laminated with another base material. Further, the transparent substrate, corona discharge treatment, flame treatment, plasma treatment, glow discharge treatment, surface treatment, surface treatment by a conventionally known method such as chemical treatment,
A coating such as an anchor coating agent or a primer may be applied.

As a method of forming a dye layer on a transparent substrate, the color temperature adjusting (and near infrared absorbing dye) dye is vapor-deposited on a transparent substrate formed into a film or sheet (plate), or a dye is formed. And a method of applying a coating solution containing A coating solution containing a color temperature adjusting dye may be prepared by dissolving the color temperature adjusting dye alone or together with a binder in an organic solvent, or a finely divided dye having a particle size of 3 μm or less, preferably 1 μm or less. It is prepared by a method of using a dispersant to disperse in a solution in which a binder is dissolved. At this time, the content of the non-solvent component such as the color temperature adjusting dye, binder or dispersant dissolved or dispersed in the solvent in the coating solution is 0.001 to 30% by weight. The proportion occupied by the color temperature adjusting dye is 0.01 to 10% by weight, preferably 0.1
~ 5% by weight. These contents are selected according to the performance of the dye layer and the production conditions, such as the thickness of the dye layer, the transmittance spectrum, the viscosity of the coating solution, and the like. As the binder used for preparing the coating liquid, polymethyl methacrylate resin, polyethyl acrylate resin, polycarbonate resin, ethylene-vinyl alcohol copolymer resin,
Polyester resins and the like can be mentioned.

[0032] The dispersant optionally used includes:
Polypinyl butyral resin, phenoxy resin, rosin-modified phenolic resin, petroleum resin, cured rosin, rosin ester, maleated rosin, polyurethane resin, and the like, further, a hydroxyl group, a carboxyl group, a sulfonic acid group,
A copolymer resin having a hydrophilic group such as a polyoxyethylene group in a side chain is exemplified. Examples of the copolymer include a copolymer of styrene and a vinyl monomer such as acrylate, methacrylate, maleic anhydride, and vinyl acetate. The amount of these dispersants used is
0.01 to 100% by weight based on the color temperature adjusting dye,
Preferably it is 0.05 to 70% by weight.

The coating solution is applied by a known coating method such as spin coating, dipping, flow coating, spraying, bar coating, gravure coating, roll coating, blade coating, and air knife coating. It is applied to a substrate to form a dye layer for adjusting color temperature. The thickness of the dye layer after drying is 0.1 to 30 μm, preferably 0.5 to 30 μm.
10 μm.

The above-mentioned dyes are often ionic dyes or complex dyes, and may cause problems such as discoloration by mixing the dyes or aggregation when mixed with the pigment dispersion type dye. In such a case, the dye can be separated into separate layers. The separated layers may be directly laminated on the transparent support, but a transparent separation layer may be provided between the layers, or may be formed separately on the front and back of the support.

Further, the filter for a display panel of the present invention comprises a resin obtained by directly dissolving or dispersing a colorant for color temperature adjustment (and near infrared absorption) in various resins or other resins. It can also be manufactured by molding, forming into a film using a molding technique such as injection molding, T-die molding, calender molding, or compression molding, and bonding it to another transparent substrate as necessary. Further, instead of the vapor deposition method or the coating method, a dye may be dyed on a resin sheet or film or another resin sheet (plate) or film, and if necessary, may be bonded to another transparent substrate for production. .

When the filter for a display panel of the present invention is used for a plasma display, an electromagnetic wave cut layer is provided, an antireflection layer for preventing reflection of external light such as a fluorescent lamp on the surface, and an antiglare (non-glare) layer. Can be provided. For the electromagnetic wave cut layer, a vapor deposition or sputtering method of a metal oxide or the like can be used.
Usually, indium tin oxide (ITO) is generally used, but a dielectric layer and a metal layer can be alternately laminated on a base material by sputtering or the like. The dielectric layer is a transparent metal oxide such as indium oxide and zinc oxide,
As the metal layer, silver or a silver-palladium alloy is generally used, and usually three, five, seven or eleven layers starting from the dielectric layer are laminated. As the substrate, the filter may be used as it is, or may be deposited or sputtered on a resin film or glass and bonded to the filter. The anti-reflection layer is a metal oxide, a fluoride, a silicide, a boride, a carbide, a nitride, in order to suppress reflection on the surface and improve the transmittance of the filter.
Inorganic substances such as sulfide, vacuum deposition method, sputtering method,
There are a method of laminating a single layer or a multilayer by an ion plating method, an ion beam assist method, and the like, and a method of laminating a resin having a different refractive index such as an acrylic resin or a fluorine resin into a single layer or a multilayer. Further, a film that has been subjected to an antireflection treatment can be attached on the filter.

The non-glare layer is formed by coating a fine powder of silica, melamine, acrylic or the like with an appropriate binder and solvent to form an ink to scatter transmitted light in order to widen the viewing angle of the filter. Can be used. The ink can be cured by heat or light. In addition, a non-glare-treated film can be attached to the filter. If necessary, a hard coat layer may be provided. Further, the display panel filter can be used alone or as a laminate bonded to a transparent glass or another transparent resin plate.

[0038]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the present invention. In the examples, “parts” means “parts by weight” and “%” means “% by weight”.

Example 1 Anthraquinone dye Diaresi manufactured by Mitsubishi Chemical Corporation
nBlue LR (Sol. B-35) (0.25 g) was dissolved in 4.75 g of toluene and DiaresinBlue was used.
An LR solution was prepared, and a polymethyl methacrylate resin (manufactured by Mitsubishi Rayon Co., Ltd., Dianal BR-8) was prepared.
0) Diaresin Blue LR is 5% based on 2 g of solid content of 20% dissolved solution (toluene / MEK = 1: 1)
A Diaresin Blue LR solution was added to prepare a coating solution.

This solution was applied on a 100 μm-thick polyester film with a bar coater so that the thickness after drying was about 5 μm, and dried to obtain a color temperature control filter. The visible portion (wavelength 38) of this filter coating resin layer alone
(0 nm to 780 nm) was measured with a Hitachi spectrophotometer (U-3500). From the measurement results, the absorbance ratio A _{600 nm} / Aλ _max (visible light), A _{400 nm} / A
_{600 nm} and A _{450 nm} / A _{600 nm} were determined, and a concentration coefficient was applied so that the absorbance at the maximum absorption wavelength in the visible part (380 _nm to 780 nm) was “0.2”. At this time, the dye absorbance was converted into transmittance (shown in FIG. 1), and the average transmittance at a wavelength of 400 to 500 nm, and a wavelength of 380 nm to 7
The average transmittance at 80 nm was calculated, and JIS Z870
The “chromaticity coordinates” with the C light source are obtained according to the formula 1 and McCam
The correlated color temperature was calculated by the formula of y.

Further, in order to confirm whether or not the value of the above calculation result is the same as when actually applied, Diaresi is used.
A coating solution having a concentration at which the absorbance at the maximum absorption wavelength of n Blue LR becomes “0.2” (based on solid content: 0.69%) is prepared in the same manner as described above, and similarly applied to a polyester film and dried. Was measured, and the average transmittance, correlated color temperature, and the like were calculated. The results are shown in Table 1 together with the above results.

According to Table 1, since the calculation results and the actual measurement results of Example 1 show almost the same values, it is considered that the calculation results reflect almost correct experimental results. Therefore, in the following Examples 2 to 4 and Comparative Examples 1 to 4, the results were obtained by the calculation method used in Example 1.

[0043]

[Table 1]

Example 2 Mitsubishi Chemical Diaresin Bl used in Example 1
use LR (Sol. B-35) and an anthraquinone dye DiaresinBlue manufactured by Mitsubishi Chemical Corporation
A filter was prepared in the same manner as in Example 1 except that P (Sol. B-95) was used, and evaluated in the same manner as in Example 1. The results are shown in Table-2.

Example 3 Copper phthalocyanine α-type dye (Pigm) manufactured by Tokyo Chemical Industry
ent. Blue 15: 1) 2.5 g and toluene 4
7.5 g of glass beads having a particle diameter of 0.8 mm
After adding to a 00 ml glass container and shaking for 8 hours with a paint shaker, the glass beads were filtered off, and a copper phthalocyanine α-type dye (Pigment. Blue 1) was added.
5: 1) A fine particle dispersion was prepared. This fine particle dispersion was used as the Diaresin Bl manufactured by Mitsubishi Chemical Corporation in Example 1.
A filter was prepared and evaluated in the same manner as in Example 1 except that the filter was used in place of ue LR (Sol. B-35). The results are shown in Table-2.

Example 4 Copper phthalocyanine α manufactured by Tokyo Kasei Kogyo used in Example 3
Instead of the type (Pigment. Blue 15: 1),
Metal-free phthalocyanine X type (Dye X-H2PC: Fastogen Blue 8120, manufactured by Dainippon Ink and Chemicals, Inc.)
A filter having a dye layer formed on a polyester film was prepared in the same manner as in Example 1 except that BS) was used, and evaluated in the same manner as in Example 1. The results are shown in Table-2.

Comparative Example 1 A titanyloxyphthalocyanine A type dye (A-Ti) was used in place of the copper phthalocyanine α type dye (Pigment. Blue 15: 1) manufactured by Tokyo Kasei Kogyo Co., Ltd. used in Example 3.
A filter having a dye layer formed on a polyester film was prepared in the same manner as in Example 1 except that OPC) was used, and evaluated in the same manner as in Example 1. Table 2 shows the results.

Comparative Example 2 A polyester film was formed on a polyester film in the same manner as in Example 1 except that Pigment Green 36 was used instead of the copper phthalocyanine α-type (Pigment. Blue 15: 1) manufactured by Tokyo Kasei Kogyo used in Example 3. A filter having a dye layer formed thereon was prepared and evaluated in the same manner as in Example 1. The results are shown in Table-2.

Comparative Example 3 Copper phthalocyanine α-type (P
i.g. Blue 15: 1) instead of Pigment Red 5 manufactured by Dainichi Seika Co., Ltd., and a 20% solution of polymethyl methacrylate resin (manufactured by Mitsubishi Rayon Co., Ltd., Dianal BR-80) (toluene / MEK 1:
1) Pigm to be 1% for 100 g of solids
A filter having a dye layer formed on a polyester film was prepared in the same manner as in Example 1 except that a coating liquid was prepared by adding a fine particle dispersion of ent Red 5, and evaluated in the same manner as in Example 1. The results are shown in Table-2.

Comparative Example 4 Pigment Red manufactured by Dainichi Seika used in Comparative Example 3
Pigment Red made by Dainichi Seika instead of 5
A filter having a dye layer formed on a polyester film was prepared in the same manner as in Comparative Example 3 except that 122 was used, and evaluated in the same manner as in Example 1. The results are shown in Table-2.

[0051]

[Table 2]

Example 5 Near infrared ray absorbent (IRG-22) 0.25 manufactured by Nippon Kayaku
g of toluene dissolved in 4.75 g of toluene and a 20% solution of polymethyl methacrylate resin (manufactured by Mitsubishi Rayon Co., Ltd., Dianal BR-80) (toluene / MEK =
1: 1) A coating solution A was prepared by adding 4% to 2 g of solid content. Similarly, T
BP-BBDT Ni Complex 0.25g
Was added so as to be 5% based on the solid content to prepare a coating solution B. Further, the Mitsubishi Chemical D used in Example 1
iaresin Blue LR (Sol. B-35)
Was added to 1% of the solid content to prepare a C coating solution. These coating solutions are coated on a polyester film using a bar coater so that the film thickness after drying is about 5 μm.
Each of them was separately applied and dried to prepare three types of films, A film, B film, and C film. At the same time, the coating solution A, the coating solution C, and the coating solution B were actually coated and dried in this order to prepare an organic film having a dye layer laminated on a polyester film. The absorbance of each film was measured in the same manner as in Example 1, and the A film and B film were measured.
Absorbance and Polyester film (1
(00 μm) is added to obtain a laminated film for calculation, and together with the actual laminated film, the absorbance is converted to transmittance under the same conditions as in Example 1, and the average transmittance, correlated color temperature, etc. are calculated. The results are shown in Table-3.

As is evident from Table 3, the results of Example 5 also show that the average transmittance and correlated color temperature of the organic film actually laminated and the organic film actually laminated were almost the same.
Hereinafter, the results of Example 6 and Comparative Examples 5 to 8 were obtained by the same calculation. In addition, TBP-BBDT Ni Com
The structure of plex is Tetra-n-butyl ph
osohonium Bis (benzene-1,2)
-Dithiolate) Ni (III) Complex
It is.

[0054]

[Table 3]

Comparative Example 5 The Diaresin Blue LR (So
l. The same procedure as in Example 5 was carried out except that the measurement data of the titanyloxyphthalocyanine A (A-TiOPC) type dye of Comparative Example 1 was used instead of B-35). A calculation at 4% was performed. The results are shown in Table-4. Comparative Example 6 In Example 5, Diaresin Blue LR
(IRG-22) and TBP-BBDTNi Co without using (Sol. B-35).
Using a plex, a filter was prepared by coating on a polyester film in the same manner as in Example 5, and evaluated in the same manner as in Example 5. The results are shown in Table-4.

[0056]

[Table 4]

Example 6 An electromagnetic wave shielding film in which silver was vapor-deposited on a polyester film of 50 μm was prepared, and the absorbance was measured. In the same manner as in Example 5, the electromagnetic wave shielding film was laminated on the filter prepared in Example 5. The spectral characteristics of the filter were determined. The results are shown in Table-5. FIG. 2 shows the transmittance curve. Comparative Example 7 A 50 μm polyester film was applied to the filter of Comparative Example 5.
An electromagnetic wave shielding film on which silver was deposited was laminated on m, and evaluated in the same manner as in Example 5. The results are shown in Table-5. Comparative Example 8 A 50 μm polyester film was applied to the filter of Comparative Example 6.
An electromagnetic wave shielding film on which silver was deposited was laminated on m, and evaluated in the same manner as in Example 5. The results are shown in Table-5.

[0058]

[Table 5]

(Note) In Tables 1 to 5, the abbreviations are as follows. PBLR: Diaresin Blue manufactured by Mitsubishi Chemical Corporation
LR (Sol. B-35) PBP: Diaresin Blue manufactured by Mitsubishi Chemical Corporation
P (Sol. B-95) CuPC 15: 1: Copper phthalocyanine α type manufactured by Tokyo Chemical Industry Co., Ltd. (Pigment. Blue 15: 1) X-H2PC: Metal-free phthalocyanine X type manufactured by Dainippon Ink and Chemicals, Inc. (Fastgen Blue 8120)
BS) A-TiOPC: titanyloxyphthalocyanine A type TBP-BBDT Ni Complex: Tetr
an-butylphosphononium Bis
(Benzen-1,2-dithiolate)
Ni (III) Complex

As is clear from Tables 1 and 2, the filters having the dye layer of the present invention described in Examples 1 to 4 have higher color temperatures than Comparative Examples 1 to 4. C
It can be seen that the color temperature of the light source is improved 1.3 to 1.4 times. Further, the dyes of Examples 1 to 4 are 400 to
The dye has an extremely high average transmittance of 500 nm and hardly hinders the light in the blue light source region, and is suitable for improving the color temperature.

From Tables 3 and 4, it can be seen that Example 5 shows a higher color temperature than Comparative Examples 5 and 6, and even when used in a filter combined with a near-infrared absorbing dye, it passed the dye layer of the present invention. It can be seen that the coloration shows good color temperature improvement. Similarly, from Table-5, since Example 6 shows a higher color temperature than Comparative Examples 7 and 8, even when an electromagnetic wave cut layer is provided, it is favorable to pass the dye layer of the present invention. It can be seen that the color temperature is improved.

[0062]

According to the present invention, the color temperature can be greatly improved by passing through a dye layer having specific spectral characteristics, and the color temperature can be improved by a filter which has been impossible in the past. In addition, the transmittance of the filter is high, the color temperature is higher than that of the light source, and the color reproduction range can be widened. Further, when a near-infrared absorbing dye layer or an electromagnetic wave cut layer is provided, the color temperature can be similarly improved, and this is suitable as a filter for a plasma display.

[Brief description of the drawings]

FIG. 1 is a transmittance curve converted from the measured absorbance of the coating solution of Example 1 (dye concentration: 5%).

FIG. 2 is a transmittance curve converted from a measured absorbance of the filter of Example 6.

[Explanation of symbols]

 1 Dye concentration 5% (solid content) 2 Dye concentration 0.69% equivalent (solid content)

Claims (11)

[Claims] 1. A color temperature adjusting method for adjusting a transmittance in a visible light region by transmitting an organic dye through a dye layer containing at least one kind thereof, wherein the dye layer has a visible light region of 380 to 780 nm. When the absorbance at the maximum absorption wavelength is 0.2, the color temperature when transmitted through the dye layer using the C light source described in JIS Z 8720 is 1.2 times the color temperature before transmission through the dye layer. A color temperature adjustment method characterized by the above. 2. A color temperature adjusting method for adjusting a transmittance in a visible light region by transmitting an organic dye through a dye layer containing at least one or more organic dyes.
The ratio of absorbance A between 50 nm and 600 nm (A _{450 nm} / A
_{600 nm} ) is 0.5 or less, and 400 _{nm to} 500
A color temperature adjusting method, wherein the average transmittance in nm is 50% or more. 3. The color temperature adjusting method according to claim 2, wherein the dye layer has a transmittance at 600 nm of 20% or more. 4. A wavelength of 400 nm and 60 nm in the dye layer.
The ratio of the absorbance A at 0 nm ( _A400nm / _A600nm ) is 1.0
The color temperature adjusting method according to claim 2, wherein: 5. The ratio of the absorbance of the dye layer at a wavelength of 600 nm to the absorbance A of the maximum absorption wavelength in the visible light region (A _{600 nm} / A
_{5. The} method according to claim 2, wherein λ _maxnm ) is 0.5 or more. 6. A color temperature adjusting method for adjusting the transmittance in the visible light range by transmitting an organic dye through a dye layer containing at least one or more organic dyes, wherein an infrared absorbing dye is compounded in the dye layer. Or by including an infrared absorbing dye in a layer different from the dye layer, the wavelength is from 800 nm to 1 nm.
An average transmittance for light of 000 nm of 10% or less;
When the ratio of the absorbance A at a wavelength of 450 nm to 600 nm (A _{450 nm} / A _{600 nm} ) is 1.0 or less,
And the average transmittance at 400 nm to 500 nm is 5
A color temperature adjustment method characterized by being set to 0% or more. 7. The transmittance at a wavelength of 600 nm is 20%.
The method according to claim 6, wherein the dye temperature of the dye layer is adjusted as described above. 8. The dye layer having a wavelength of 400 nm and a wavelength of 600 nm.
The color temperature adjusting method according to claim 6, wherein the ratio of the absorbance A of m (A _{400 nm} / A _{600 nm} ) is 2.0 or less. 9. A color temperature control filter containing at least one organic dye in a dye layer, wherein the color temperature control filter comprises:
8. A color temperature adjustment filter using the color temperature adjustment method according to 8. 10. A filter for a plasma display panel comprising the color temperature adjusting filter according to claim 9. 11. The plasma display panel filter according to claim 10, further comprising an electromagnetic wave cut layer provided in the plasma display panel filter.