WO1997046897A1

WO1997046897A1 - Pdp filter and pdp device

Info

Publication number: WO1997046897A1
Application number: PCT/JP1997/001662
Authority: WO
Inventors: Masuhiro Shouji; Hiroki Katono; Yoshinobu Itoh; Takeo Ogihara; Teruo Sakagami
Original assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
Priority date: 1996-06-03
Filing date: 1997-05-16
Publication date: 1997-12-11

Abstract

A PDP filter and PDP device which of which the safeness concerning leakage of electromagnetic waves of various wavelengths is further enhanced while the features of a PDP (plasma display) are not deteriorated. The PDP optical filter such that the ratio (Tv/Tn) of the visible light transmissivity (Tv) to the transmissivity (Tn) of near infrared radiation in a wavelength range of 800 - 1000 nm is not less than 3 consists of a transparent substrate (3) made of polymer containing a near infrared absorbing component composed of divalent copper ions (1) and/or near infrared absorbing pigment (2).

Description

m Itoda ¾

Filler for PDP and PDP device

Technology

The present invention relates to an optical filter for a plasma display (PDP) having a near-infrared cut function to be disposed on the front surface (visible light transmitting side) of a plasma display (panel), and the optical filter for transmitting visible light to a discharge cell. A PDP device that is disposed on the side of a PDP device and that can prevent the eye from being damaged due to near infrared rays emitted from the PDP. Background art

A PDP, which is a display device that uses a light emission phenomenon based on gas discharge, usually uses light emission by electromagnetic waves itself (visible light) due to discharge in a closed gas space sandwiched between two glass plates, or This is a display device that excites a phosphor based on electromagnetic waves (such as ultraviolet rays) to emit light.

A PDP, a type of electronic display, has a very strong nonlinearity, so even if it has a very large number of cells (for example, more than 100,000), it emits virtually no light except for the selected cells, so it has a large area. Easy to use; long life, high luminance, high luminous efficiency, and easy to achieve high contrast; and wide viewing angle, easy to achieve full color, etc. (Kobayashi 'Toyama "Display", pages 11-13, 114 (1989) Maruzen).

PDPs that are widely used at present are roughly classified into two types, DC type and AC type, because of their structure.Either case has the same light emission principle, and fluorescent light is emitted by the ultraviolet light generated by the above gas discharge. They excite the body and get visible light. Today's PDPs for displaying color images consist of millions of small display cells arranged in the order of millions, in which the above-mentioned discharge and light emission are performed. Red in this microcell, Green and blue phosphors are applied, and cells of each color are distributed in the PDP so that there is no color unevenness. By controlling the emission of the cell at each position A at each color, the luminance M and intensity are adjusted to obtain a single color image as the entire PDP image.

Ultraviolet light based on gas discharge is used to emit the above-mentioned phosphor, and xenon is often used as a discharge gas for generating the ultraviolet light. In particular, for stable discharge, helium and neon are often used as the base gas, and xenon, which is the rare gas and has the longest resonance line wavelength, is often used as the ultraviolet radiation gas. It has become something.

In recent years, the effects of electronic displays on the human body in general (particularly the effects of electromagnetic waves that leak from the displays) have been receiving attention. PDP emits light by using the discharge of a gas (typically, xenon gas or a mixed gas containing xenon), and the gas discharge may generate electromagnetic waves of various wavelengths. Combined with the recent enforcement of the Product Liability Law (PL Law), demands on human safety in displays in general have become an increasingly high hurdle. Therefore, an object of the present invention is to provide a PDP filter or a PDP device capable of minimizing the influence of electromagnetic waves on the human body. Another object of the present invention is to provide a PDP filter or a PDP device capable of further increasing the safety with respect to leakage of electromagnetic waves of various wavelengths without substantially impairing the above-described characteristics of the PDP. Is to do.

Disclosure of the invention

The present inventors have conducted intensive studies and have found that a polymer constituting a transparent substrate contains divalent copper ion and / or a near-infrared absorbing dye so that a near-infrared ray (wavelength = 800 to 100 nm) Found that Phil, who selectively reduced the transmittance of PDPs, dramatically improved the safety of PDPs with respect to leakage of electromagnetic waves.

The optical filter for PDP of the present invention is based on the above findings, and is described in more detail. Is a filter comprising at least a transparent substrate made of a polymer containing a near-infrared absorbing component;

The near-infrared absorbing component comprises a divalent copper ion and / or a near-infrared absorbing dye, and has a visible light transmittance (Tv) as a filter and a near-infrared transmittance (Tn) of 800 to 1000 nm. The ratio (Τν / Τη) is 3 or more.

According to the present invention, further, at least one discharge cell having a pair of electrodes facing each other therein and having a gas sealed between the pair of electrodes is disposed on the visible light transmitting side of the discharge cell. Optical filters that have been processed; and

The optical filter includes at least a transparent substrate made of a polymer containing a divalent copper ion and / or a near-infrared absorbing dye; and a visible light transmittance (Τ V) as the filter; A plasma display device characterized by having a ratio (Tv / Tn) to a near infrared transmittance (Tn) of 800 to 1000 nm of 3 or more.

The filter of the present invention described above has a selectively reduced transmittance in the near-infrared region (wavelength = 800 to 1000 nm), so that the fill gas of the PDP (for example, xenon gas or xenon) is used. Even if near-infrared light is radiated out of the system due to discharge of mixed gas (including mixed gas), the near-infrared light is selectively cut without substantially impairing the visible light characteristics of the PDP. Is possible.

As mentioned above, the discharge of xenon, which is commonly used in the PDP, may emit (negligible amount of) near infrared rays harmful to the human body. Even though the near-infrared radiation in each cell is relatively small, the near-infrared radiation from the whole PDP panel with many cells may have serious effects on the human body.

When near-infrared rays reach the human eye from the PDP, depending on the degree, heat may be stored in the retina or choroid of the eye, which may have an adverse effect on cell aging, burns, etc. (Fumitada Hata; Ophthalmology, Vol. 24, pp. 731-737 (1982)). Major examples of near-infrared-induced disorders include the retina and choroid. Of the light coming into the human eye, most of the light below 295 nm is absorbed by the cornea, and about 80% of the light below 400 nm is absorbed by the lens. On the other hand, in the infrared region, light of 2400 nm or more does not pass through the cornea at all and is absorbed by the cornea. Therefore, the light reaching the retina is light in the range of approximately 400 nm to 2400 nm.

According to the study of the present inventor, of the above-mentioned light in the range of 400 nm to 2400 nm, the problematic one is the near infrared region in the range of 750 to 1200 nm (particularly 800 to 1000 nm). After reaching this area, light in this range is absorbed by cells and stored as heat. As described above, such heat accumulation has an adverse effect on the retina and choroid, such as promotion of cell aging.

However, when the filter or PDP device of the present invention having selective transmittance as described above is used, the function of selectively cutting near infrared rays in front of the PDP (visible light transmitting side) is provided. Since it is provided, it is possible to prevent the above-mentioned adverse effects of near-infrared rays (particularly, light having a harmful wavelength of 800 to 1000 nm, which has a large effect on the human body). BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic cross-sectional view showing one embodiment of a transparent substrate constituting a PDP optical filter of the present invention (a divalent copper ion and a near-infrared absorbing dye are present in one layer).

FIG. 2 is a schematic cross-sectional view showing another embodiment of the transparent substrate constituting the optical filter for a PDP of the present invention (a divalent copper ion and a near-infrared absorbing dye are present in separate layers). .

FIG. 3 is a schematic cross-sectional view showing an example of a DC-type PDP cell.

FIG. 4 is a schematic sectional view showing an example of an AC type PDP cell. FIG. 5 is a spectral distribution graph showing an example of xenon luminescence measurement. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described more specifically with reference to the drawings as necessary. In the following description, “parts” and “%” representing the ratio are based on mass unless otherwise specified.

(Selectivity of near infrared transmittance)

In the transparent substrate constituting the filter of the present invention, the ratio (Τν / Τη) between the visible light transmittance (Tv) and the near infrared transmittance (Tn) of 800 to 1000 nm is 3 or more. From the viewpoint of selective transmission of visible light, Τν / この η is preferably 4 or more (more preferably 10 or more).

From the viewpoint of the near-infrared power, the near-infrared transmittance of the filter of the present invention at 800 to 1000 nm is preferably 30% or less, more preferably 10% or less (particularly 5% or less T). preferable. Further, from the viewpoint of visible light transmittance, the visible light transmittance of the filter of the present invention at 400 to 800 nm is preferably 60% or more, more preferably 70% or more (particularly about 5% or more). .

(Measurement method for visible light, near infrared transmittance, Tv / Tn ratio)

The above visible light transmittance (Tv) is obtained from the spectral transmittance data of the sample under test measured by a spectrophotometer according to JIS (Japanese Industrial Standards) R 3106-1985 (transmittance, reflectance, solar heat of sheet glass) It can be obtained by calculation based on the following formula (Equation 1) in accordance with the definition of V (visible light transmittance) in the rate test method (the ratio of the transmitted light beam to the incident light beam for the daylight beam incident on the glass). 9

08 ε

08

(ΐ 08ε = ^Λ 1

, Reno ο ₈

Z99lO / L6d £ / ∑Dd L6S9P / L6 OAV In the above _H d Equation (number 1), D e is the spectral distribution of standard light D65, V who is visibility photopic standard ratio of CIE (International Lighting Committee Meeting International Commission on Illumination). As the “D person · V person” in the above formula, the numerical value of “Appendix 1” of JISR 3106 (shown below as ^ Table 1) is used. According to the inventor's knowledge, the visible light transmittance rv (visible light range: 380 to 780 nm) specified by JIS: ； is the visible light transmittance (Tv) used in the present invention. ) Is substantially equal to 倘. This is because the product of the transmittance of the optical filter of the present invention in the range of 380 to 400 nm and in the range of 780 to 800 nm and Ε> Λ · ν _λ in Table 1 is qualitatively This is because it can be ignored.

(table 1 )

(Appendix Table 1) Excitation coefficient for calculating visible light transmittance and visible light reflectance 反射 ¾

13 λV λ

λ (nm)

380 0.00

390 0.01

400 0.03

410 0.11

420 0.37

430 1.01

440 2.41

450 4.45

460 7.07

470 10.45

480 16.12

490 22.63

500: .32

510 54.22

520 74.40

530 92.83

540 99.61

550 103.52

560 99.50

570 91.71

580 83.34

590 67.14

β () ϋ 56.80

610 45.07

620 33.41

630 22.07

640 Η.65

650 8.56

660 4.89

670 2.63

680 1.33

690 0.57

700 0.29

710 0.16

720 0.06

730 0.04

740 0.02

750 0.01

760 0.00

770 0.00

780 0.00

∑ A FA = 1056.81 On the other hand, near-infrared transmittance (Tn) is calculated from the spectral transmittance data (te (person)) of the sample under test measured by a spectrophotometer in the range of 00 to 1000 nm according to the definition of denotation (number). calculate.

Star

s

,

CO

In the above formula (Equation 2), a human is set at an interval of 10 nm. From the TV and Tn obtained in this way, the ratio (Τν / Τη) is calculated.

The spectrophotometer used for the measurement of Τν and Τη is not particularly limited as long as it satisfies JISR 3106 “3.2j conditions (in the measurement of Tn, the measurement wavelength range is also 800 to 100 nm). For example, a commercially available spectrophotometer (trade name: U-4000, manufactured by Hitachi, Ltd.) can be used.

(Polymer constituting transparent substrate)

In the present invention, the polymer constituting the transparent substrate is a polymer containing a near-infrared absorbing component composed of divalent copper ions and / or a near-infrared absorbing dye. The content of the near-infrared absorbing component (divalent copper ion and / or near-infrared absorbing colorant) in the polymer is not particularly limited as long as it satisfies Tv / Tn described later, but the component is dispersed in a polymer. From the viewpoint of the balance between the properties and the near-infrared absorption efficiency, the following is preferred.

(1) When using divalent copper ions

(Regardless of the presence or absence of a polymerizable functional group) 0.01 to 20%, based on the total weight of the divalent copper ion-containing polymer (the sum of the weight of the polymer and the weight of copper if mixed) Is preferably in the range of 0.1 to 15%. If the content of divalent copper ions exceeds 20%, the dispersibility of divalent copper ions in the resin tends to decrease, and it tends to become an opaque film base material. On the other hand, if the content of divalent copper ions is less than 0.01%, the absorption efficiency of near-infrared rays decreases, and it becomes difficult to satisfy the fill / unload performance such as Tv / Tn described later.

(2) When using near infrared absorbing dye

The amount of the near-infrared absorbing dye is 0.000 based on the total mass of the polymer containing the near-infrared absorbing dye (the sum of the mass of the polymer and the mass of the near-infrared absorbing dye in the case of mixing). It is preferably in the range of 10% to 10% (further 0.01 to 10%). The preferred range of the near-infrared absorbing dye depends on the thickness of the transparent substrate in which the dye is to be contained. Also tend to change to some extent. ^ When the substrate length is 0.005 to 0.1 mm, it should be about 0.01 to 10%, and when the zo exceeds 0.1 mm, it should be about 0.001 to 0.1%. Is preferred.

(3) When using divalent copper ion and near-infrared absorbing dye together

The preferred ranges in (1) and (2) above can also be used in a combined system of the above two components. In this combination system, as shown in the schematic cross-sectional view of FIG. 1, divalent copper ions 1 and near-infrared absorbing dye 2 are uniformly dispersed in the polymer constituting the transparent substrate 3 to form one layer. As shown in the schematic cross-sectional view of FIG. 2, divalent copper ion 1 and near-infrared absorbing dye 2 are separately formed in the polymers constituting transparent layers 3a and 3b. After dispersion, these layers 3 a and 3 may be laminated to form the transparent substrate 3. In the case of the embodiment as shown in FIG. 2, in consideration of the respective dispersibility of the divalent copper ion 1 and the near-infrared absorbing dye 2, different types of polymers are used to form the transparent layers 3a and 3b. It becomes possible to select the polymer of the above.

(Polyvalent copper ion-containing polymer)

The method for producing the bivalent copper ion-containing polymer is not particularly limited, and for example, the following methods (1) to (3) can be used. From the viewpoint of uniformly dispersing the divalent copper ions in the polymer, the preferred order of the method is (1)> (2) or (3).

(1) A method in which a divalent copper ion-containing monomer is polymerized alone or together with another compound (another polymerizable monomer and / or a non-polymerizable compound).

(2) Non-polymerization containing divalent copper ions: a method in which another monomer is polymerized in the presence of a compound.

(3) Disperse the divalent copper ion-containing compound (by kneading, etc.) in the polymer

-The transparent substrate is composed of a phosphoric acid group-containing monomer It must contain a copolymer obtained by copolymerizing a single-part composition composed of compatible monomers, and a metal ionizable component containing divalent copper ions as a main component. Is preferred.

(Formula 1)

PO (OH) _n R ₃ -n… (1)

[However, R is

X

CH ₂ = C-CCC ₂ H ₄ O ½r

O

(X represents a hydrogen atom or a methyl group, m is an integer of 1 to 5.), and n is 1 or 2. ]

(Method for producing divalent copper ion-containing polymer)

When the transparent substrate is made of a divalent copper ion-containing polymer, from the viewpoint of the dispersibility of copper ions, a phosphate group-containing monomer and a copolymerizable monomer S represented by the above formula (Formula 1) are used. It is preferable that a metal ion mainly composed of copper ions is contained in a copolymer of a mixed monomer comprising

The phosphate group-containing monomer represented by the above formula (Formula 1) has a phosphate group capable of binding to a copper ion described later in a molecular structure. Such a copolymer holding a copper ion via a phosphate group has a characteristic light absorption characteristic in the near infrared region. In the above-described molecular structure of the phosphoric acid group-containing monomer, an acryloyloxy group or a mesyacryloyloxy group, which is a radically polymerizable functional group, is bonded via an ethylene oxide group. The phosphoric acid group-containing monomer is extremely copolymerizable, and can be copolymerized with various monomers.

In the phosphoric acid group-containing monomer (I-Dani 1), R represents an acryloyloxy group (X is a hydrogen atom) to which an ethylene oxide group is bonded or a methyl acryloyloxy group.

(X is a methyl group). Here, the number m of repeating ethylene oxide groups is preferably an integer of 1 to 5. When the value of m exceeds 5, the hardness of the obtained copolymer tends to decrease, and the practicality as an optical filter may be reduced.

In the above formula (Idani 1), the number n of the hydroxyl groups can be any one of 1 and 2 depending on the molding method and use purpose of the optical filter. When n = 2, that is, the phosphate group-containing monomer having one radically polymerizable functional group bonded to a phosphorus atom has a high bondability with a copper ion. On the other hand, the phosphate group-containing monomer having n = 1, that is, the phosphate group-containing monomer having two radically polymerizable functional groups has crosslinking polymerizability. Therefore, when the optical filter of the present invention is manufactured by an injection molding method or an extrusion molding method which is a general molding method of a thermoplastic resin, a phosphate group-containing monomer having n = 2 It is preferable to use However, the molding method of the optical filter is not limited to these.

As described above, the value of n can be selected according to the performance of the optical filter, the molding method, and the purpose of use, but from the viewpoint of the solubility of copper ions in the monomer, phosphorus having n = l It is preferable to use an acid group-containing monomer (ィ 1) and a phosphate group-containing monomer (n1) in which n = 2. The body, the proportion of which is almost equal (for example, the molar ratio of (n = l) / (n = 2) = 4/6 ~ 6Z4, even 4.5 / 5.5 ~ 5.5. (5 / 4.5 ratio).

The monomer for obtaining the copolymer preferably contains, in addition to the phosphate group-containing monomer (Formula 1), usually another copolymerizable monomer. The copolymer obtained by copolymerizing the phosphoric acid group-containing monomer (Chemical Formula 1) with the copolymerizable monomer has low hygroscopicity, satisfies the hardness conditions required for optical filters, Also excellent in shape retention. Therefore, when such a copolymer is used, the performance as an optical filter can be improved.

Such a copolymerizable monomer is uniformly dissolved and mixed with (1) a phosphoric acid group-containing monomer (I) and (2) a phosphoric acid group-containing monomer (Chem. 1). It is not particularly limited as long as it has good radical copolymerizability and (3) gives an optically transparent copolymer.

Specific examples of the copolymerizable monomer that can be used in such an embodiment include methyl acrylate, methyl methyl acrylate, ethyl acrylate, ethyl methacrylate, n-propyl acrylate, and n-propyl methacrylate. A lower alkyl acrylate having 1 to 8 carbon atoms in the alkyl group; and a glycidyl group such as a lower alkyl methacrylate, glycidyl acrylate, glycidyl methacrylate, or 2-hydroxyethyl methacrylate.変性 Modified alkyl acrylate substituted with hydroxyl group and modified alkyl methacrylate, ethylene glycol dimethyl acrylate, diethylene glycol dimethacrylate, borochi Lenglycol dimethacrylate, 1,4-butanediol diacrylate, 1,4-butanediol dimethacrylate, 2,2-bis [4-methacryloxyethoxy xyphenyl] propane, trimethylolpropane triacrylate Polyfunctional acrylates such as pentaerythritol trimethacrylate, pentaerythrite trimethacrylate, and carboxylic acids such as polyfunctional methacrylate, acrylic acid, and methyl methacrylate, styrene, polymethylstyrene, halogenated styrene, methoxy, and the like. Examples thereof include aromatic vinyl compounds such as styrene and divinylbenzene. These compounds may be used alone or, if necessary, in combination of two or more to constitute a copolymerizable monomer.

In the mixed monomer for obtaining the copolymer constituting the optical film of the present invention, the ratio of the phosphoric acid group-containing monomer (Formula 1) to the above-mentioned copolymerizable monomer is as follows. The phosphoric acid group-containing monomer: the copolymerizable monomer (mass) is in the range of 3:97 to 90:10, and more preferably in the range of 10:90 to 80:20. Preferably, there is. If the ratio of the phosphoric acid group-containing monomer is less than 3% based on the “mass of the phosphoric acid group-containing monomer and the copolymerizable monomer”, light absorption characteristics suitable as an optical filter Expression becomes difficult. On the other hand, if this ratio exceeds 90%, the obtained copolymer tends to be flexible, and it is difficult to satisfy the hardness condition required for the filter.

The copolymer constituting the optical filter of the present invention is usually obtained by radical polymerization of a mixed monomer composed of a phosphoric acid group-containing monomer (Idani 1) and a copolymerizable monomer. . The radical polymerization method is not particularly limited, and a known method such as a cast polymerization method using a known radical polymerization initiator, a suspension polymerization method, an emulsion polymerization method, or a solution polymerization method can be used. It is.

In an embodiment in which the polymer constituting the optical filter and the transparent substrate of the present invention comprises a polymer containing a metal ion having copper ion as a main component, the metal ion y: is contained in the copolymer. Based on the interaction with the phosphoric acid group, it has the effect of efficiently absorbing wavelength light in the near infrared region. Here, "The main component is copper ion." Means that copper ions account for at least 50 (quality)% of all metal ions in the polymer. If the proportion of copper ions is less than 50%, the absorption efficiency of light in the near infrared region of the obtained optical filter tends to decrease. From the viewpoint of absorption efficiency in the near infrared region, the proportion of copper ions is preferably 70% or more (more preferably, 80% or more).

Various copper salts can be used as the copper salt that constitutes the metal salt described above. More specifically, examples thereof include anhydrides and hydrates such as copper acetate, copper chloride, copper formate, copper stearate, copper benzoate, copper ethyl acetate, copper pyrophosphate, copper naphthenate, and copper citrate. However, it is not limited only to these copper salts. Further, as the “other metal” constituting the above metal salt, a metal salt containing sodium, potassium, calcium, iron, manganese, cobalt, magnesium, nickel, or the like as a metal component can be appropriately used according to the purpose. It is.

The method for incorporating copper ions into the polymer is not particularly limited, but the following method can be suitably used.

(1) A method in which the metal is added to a copolymer obtained by radical polymerization of a mixed monomer and mixed.

More specifically, (i) a method in which a metal salt is added to and mixed with a heated and melted copolymer; and (ii) a method in which a copolymer is dissolved in an organic solvent and a metal salt is added to and mixed with this solution. Etc. can be used.

(2) A method in which metal ions are added to and mixed with the mixed monomer before radical polymerization of the mixed monomer is performed. According to this method, a metal mixture containing the metal ion, a phosphate group-containing monomer (Chemical Formula 1) and a copolymerizable monomer is prepared, and the monomer mixture is subjected to radical polymerization. Polymerize.

By a method as described in (1) and (2) above, a copolymer containing copper ions (optical filter material) can be obtained.

(Method of producing copper ion-containing polymer) The copper ion-containing polymer constituting the optical filter of the present invention includes a step of extracting and removing an acid component (organic acid component or inorganic acid component) generated by a reaction between a phosphate group and a metal salt using a solvent. An optical filter having a low content ratio of an acid component can be obtained by a production method including the same.

The step of extracting and removing the acid component can be performed at any stage of the optical filter manufacturing process, before or after the radical polymerization. For example, (1) a monomer mixture is prepared by mixing a mixed monomer comprising a phosphate group-containing monomer and a copolymerizable monomer with a metal salt mainly containing copper ions. A stage before radical polymerization is performed, (2) a stage in which the radical polymerization of the above monomer mixture has been completed, and an optical filter material has been obtained, (3) a stage in which the optical filter material has been formed, and the like. It can be implemented at any stage.

When the mixed monomer containing the cross-linking monomer is polymerized by the cast polymerization method, the step of extracting and removing the acid component may be performed after the completion of the molding process.

Solvents that can be used in the acid component extraction / removal step include those that can dissolve the acid component and have an appropriate affinity for the copolymer (they do not dissolve the copolymer, but have a degree of permeation into the copolymer). (Affinity).

Specific examples of such a solvent include water, aliphatic lower alcohols such as methyl alcohol, ethyl alcohol, n-propyl alcohol, and isopropyl alcohol; ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone. , Ethers such as ethyl ether and petroleum ether, aliphatic hydrocarbons such as n-pentane, n-hexane, n-heptane, chloroform, methylene chloride, carbon tetrachloride, and halides thereof; Aromatic compounds such as benzene, toluene and xylene can be mentioned. These solvents can be used alone or as a mixture of two or more as needed.

(1) Among the above solvents, water, methyl alcohol, ethyl alcohol, isobromo alcohol, acetone, methylene chloride, etc. are extracted and removed from the acid component. It is particularly preferable from the viewpoint that it hardly remains in the extract afterwards.

The acid component a to be removed in the acid component extraction and removal step is preferably at least 30 (mass)%, more preferably at least 45%, based on the amount of the acid component of the metal salt used. The removal amount of such an acid component can be determined, for example, by quantifying the eluted component in the solvent by an ordinary analytical method such as liquid chromatography, gas chromatography, or titration of an acid equivalent.

The optical filter manufactured by performing the above-described acid component extraction / removal step was compared with an optical filter manufactured without the extraction / removal step, as will be understood from the examples described later. It is excellent in the following points.

(1) Bleed hardly occurs on the surface of the filter even when used in a high humidity atmosphere.

(2) Almost no whitening phenomenon (clouding phenomenon) and low transparency phenomenon (devitrification phenomenon) due to bleeding on the filter surface occur.

In the production method of the present invention, after the step of extracting and removing the acid component, the molded article is washed with water and dried as necessary to remove the residual solvent used in the extraction, and the surface smoothness of the optical filter is reduced. A step of subjecting the molded product to heat and pressure treatment may be performed in order to prevent the molded product.

(An embodiment using a phosphoric acid compound having no polymerization functional group)

In the above-described embodiment of the present invention, copper ions are dispersed in a polymer using a phosphoric acid group-containing monomer having a polymerizable functional group, but copper ions are dispersed in a polymer without using such a monomer. It is also possible to disperse them inside. In the latter embodiment, from the viewpoint of dispersibility of copper ions, it is preferable to use a phosphate compound (phosphate ester, phosphonate ester) having no polymerizable functional group as shown below. The phosphate ester used in such an embodiment is preferably represented by the following formula (Formula 2). (Formula 2)

PO (OH) n (OR ¹ ) In the above formula (Chemical Formula 2), R ¹ represents an alkyl group having 1 to 20 carbon atoms.

Examples of such a phosphate ester (Chemical Formula 2) include monomethyl phosphate, dimethyl phosphate, monoethyl phosphate, getyl phosphate, monopropyl phosphate, dipropyl phosphate, and monoisopropyl. Phosphate, diisopropyl phosphate, mono-n-butyl phosphate, di-n-butyl phosphate, monobutoxetyl phosphate, dibutoxyshethyl phosphate, mono (2-ethylhexyl) phosphate, di ( 2-ethylhexyl) phosphate, mono-n-decyl phosphate, di-n-decyl phosphate, mono-isodecyl phosphate, di-isodecyl phosphate, mono-oleyl phosphate, di-oleyl phosphate, mono-iso Stearyl phosphate, diisostearyl phosphate Hue Ichito, Monofue two Rufosufue one Bok include diphenyl phosphine off We over preparative like.

On the other hand, as the above-mentioned phosphonate, those represented by the following formula (Formula 3) are preferable.

(Formula 3)

POR ² (OH) (OR ³ ) In the above formula (Chemical formula 3), R ² and R ³ are each an alkyl group having 1 to 20 carbon atoms, even if R ² and R ³ are the same. Well, they may be different. Specific examples of such a phosphonic acid ester (I-Dani 3) include monomethylmethyl Examples thereof include phosphonate, monoethylethyl phosphonate, monobutylbutylphosphonate, and mono (2-ethylhexyl) 2-ethylhexylphosphonate.

The amount of the specific phosphoric acid ester (Chemical Formula 2) or phosphonic acid ester (I-Shadow 3) added is 1 to 10 times the molar amount of divalent copper ions added to the resin (more preferably 2 to 5 times the amount of divalent copper ions) Mol). If the amount of such a phosphoric acid compound is less than 1 mol, the dispersibility of divalent copper ions in the resin may be insufficient. On the other hand, if the added amount exceeds 10 times mol, there is a possibility that mechanical properties such as hardness of the resin are affected.

(Acrylic resin)

In the embodiment of the present invention in which a phosphate compound having no polymerization functional group is used, the resin component to be used in combination with the phosphate compound is preferably an acryl-based resin. Examples of the monomer constituting the acryl-based resin include n-butyl (meth) acrylate, t-butyl (meth) acrylate, isobutyl (methyl) acrylate, and 2-ethylhexyl (meth) acrylate. Acrylate, isodecyl (meth) acrylate, n-lauryl (meth) acrylate, tridecyl (meth) acrylate, n-stearyl (meth) acrylate, isobonyl (meth) acrylate, and the like.

Among these monomers, monomers composing a resin component having good solubility of a complex of a divalent copper ion and a phosphate (formula 2) or a phosphonate (formula 3) include: t Monobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and isobonyl (meth) acrylate, and these monomers can be used alone or in combination of two or more.

As other copolymerizable monomers constituting the above resin component, if necessary, ethyl

(Meth) acrylate, methyl (meth) acrylate, and the like may be used as long as the solubility of the copper complex is not inhibited. Further, in addition to these monomers, methoxy r-yl (meth. Acrylate), ethoxyxetil (meth- yl) acrylate, phenoxyshethyl (meth) acrylate, and the like can also be used. Since all of the above-mentioned monomers are monofunctional mono-S-isomers, the resin obtained by polymerizing the 量 -mer selected from these is a thermoplastic type. As the monomers that can be used in the present invention, in addition to the monofunctional monomers, some of these monofunctional monomers (for example, about 5 to 70 mol% or less) may be used in place of the polyfunctional monomers. May be. In this case, the resulting resin is of a thermosetting type and cannot be molded by heat, but has the advantage of increasing the rigidity of the resin itself.

(Optical filter containing near infrared absorbing dye)

In the above, the embodiment of the present invention in which the transparent substrate constituting the optical filter is made of a polymer containing copper ions has been described. However, in the present invention, near-infrared absorption is performed instead of or together with copper ions. A dye may be contained in the transparent substrate.

Examples of the near-infrared absorbing dye that can be used in the embodiment of the present invention include those that transmit a visible light of 400 to 800 nm well and absorb a near infrared wavelength range of 800 to 1000 nm. That is, a dye capable of providing a filter having a ratio (Τ ν / Τ η) of the visible light transmittance (TV) as the filter and the near-infrared transmittance (Tn) of 800 to 1000 nm of 3 or more. If it is, it can be used. Specific examples of near-infrared absorbing dyes include metal complex-based, phenylenediamine derivatives, quinone-based pigments, dyes, and organic dyes. These dyes or compounds have a thickness of about 0.01% to 10% when the thickness of the filler is 0.005 to 0.1 mm and the thickness of the filler is based on the weight of the resin component. When the thickness exceeds 0.1 mm and is equal to or less than 20 mm, it is preferable to use a ratio of about 0.001 to 0.1%.

As the near-infrared absorbing dye, an infrared absorbing agent comprising a phenylenediamine derivative represented by the following formula (Formula 4) can be particularly preferably used. Such infrared absorbers exhibit good infrared absorption properties in the wavelength range from about 900 to 1000 nm. (Formula 4)

1: In the formula (Formula 4), R represents a hydrogen atom or an alkyl group having 1 to 12 carbon atoms, and X represents SbF ,,, Cl ₄ , PF _fi , BF «, N 0 _{: i} or Represents a halogen atom, and n is 1 or 2.

Specific examples of the phenylenediamine derivative (I-Dani 4) include N, N, N ', N'-tetrakis (p-di-n-butylaminophenyl) -p-benzoquinone-bis

(Imodium perchlorate), N, N, N ', N'-Tetrakis (p-methylaminophenyl) -p-Benzoquinone-bis (hexafluoroantiminate of immonium), N, N , N ', N'-Tetrakis (p-di-n-hexylaminophenyl) -P-benzoquinone-bis (imidodium fluoroboronate), N, N ,,', N'-tetrakis (Ρ-diisopropylaminophenyl) 1 ρ —benzoquinone monobis (imonidium nitrate), Ν, Ν, Ν,, N '—tetrakis (ρ-di-1 η—suctylaminophenyl) ) 1ρ-benzoquinone monobis (hexafluoroantimonate of immonium), Ν, Ν, Ν,, Ν, -tetrakis

(ρ-Jetylaminophenyl) 1 ρ-Benzoquinone 1-bis (bromine salt of imodimium), Ν, Ν, Ν,, Ν, -tetrakis (ρ-G η-butylaminophenyl) 1 ρ —Phenylene diamine perchlorate, Ν, Ν, Ν,, Ν, 1-tetrax (ρ-dimethylaminophenyl) 1 ρ-phenylene diamine, chloride, Ν, Ν, Ν ', N'-Tetrakis (ρ-Gee η-dodecylaminophenyl) -hexafluoroantimonate of ρ-phenylenediamine, Ν, Ν, Ν,, Ν, one-tetrakis (ρ 1-O-phenylenediamine borohydride, Ν, Ν, Ν ', Ν, -tetrakis (ρ-di-1 η-butylaminophenol) 1-p-phenylenediamine Fluorine salt, Ν, Ν, Ν,, N '— Tetrakis (ρ-Jetirami) Phenyl) Single ρ- phenylene Renjiami two © beam of perchloric periodate, and the like.

A metal complex-based compound (phthalocyanine-based compound, etc.) can be used as the near infrared absorbing dye. Specific examples of such phthalocyanine compounds Examples include compounds soluble in alcohols, ketones, aromatic hydrocarbons, and the like, such as 4,5-oxoquinonelinoxy (3,6-oxoquinonethio) oxy vanadium phthalocyanine, And tetrakisanilino- (3,5,6-dodecakisphenoxy) zinc phthalocyanine.

(Transparent substrate)

First, the thickness of the transparent substrate (filtration substrate) constituting the filter of the present invention depends on the absorption of the near-infrared absorbing agent (divalent copper ion and / or near-infrared absorbing dye) used. When a near-infrared absorber having a large extinction coefficient, which varies depending on the coefficient, is used, the performance of the present invention can be satisfied even with a smaller thickness. On the other hand, the upper limit of the thickness is limited by the mechanical strength and weight of the base material. A thicker plate has the advantage of increasing the strength, but is not preferred because the weight of the fill increases.

In the present invention, the thickness of the transparent substrate is usually 0.003 to 50 mm, more preferably 0.05 to 20 mm (more preferably 0.05 to 5 mm). The range described above can be suitably used.

(Metal oxide)

The optical filter of the present invention may contain a metal oxide as an infrared non-transmitting substance in addition to the above components (polymer, divalent copper ion, and / or near-infrared absorbing dye). Good. Such an infrared non-transmissive substance may be dispersed in the above-mentioned transparent substrate, or may be formed as a layer separate from the transparent substrate. In the latter case, a dispersion type film in which fine particles of the metal oxide are dispersed in a synthetic resin (binder) may be formed, or a deposition type film formed of a metal oxide deposit may be used. It may be configured.

The above-mentioned metal oxide is preferably composed mainly of indium oxide and / or tin oxide from the viewpoint of non-transmission of infrared rays. The use of such a metal oxide is particularly effective in increasing the cutting effect in the infrared region of 1200 nm or more. preferable. When the gold oxide contains indium oxide as a main component, the-part of the indium atom in the indium oxide is replaced with a tin atom, and further, oxygen vacancies are introduced to increase the carrier electron density in the indium oxide. It is preferably a composite oxide of indium oxide and tin oxide (IT〇, Indium Tin Oxide). When the gold oxide is mainly composed of tin oxide, some of the tin atoms in the tin oxide are replaced by antimony atoms, and oxygen defects are introduced to increase the carrier electron density in the tin oxide. Further, it is preferably a composite oxide of tin oxide and antimony oxide (AT 0, Antimony Tin Oxide).

When it is contained in the above-mentioned transparent substrate or dispersion type film, the maximum particle size is 0.1 zm or less in view of the balance between visible light transmittance and uniform dispersibility. Ultrafine powder having a distribution in the range of 0.001 to 0.05 μm is preferably used. The thickness of the dispersion type film is preferably 0.1 to 50 m, more preferably 0.5 to 10 m.

The binder in the dispersion type film is not particularly limited as long as it is a synthetic resin having a large light transmittance in a visible light region, that is, an excellent transparency. More specifically, for example, acrylic resin, vinyl chloride resin, styrene resin, polyurethane resin, melamine resin, epoxy resin, polyester resin, polyamide resin, fluororesin, silicone resin, cellulose resin, polyvinyl resin A thermoplastic resin such as an alcohol-based resin, or a thermosetting resin or a photocurable resin can be used.

When the metal oxide is contained in the transparent substrate, its content is preferably 0.1 to 98%, more preferably 1 to 98%. When the above-mentioned metal oxide is contained in the dispersion-type film, it is preferable that the amount of the metal oxide is as large as possible as long as the adhesion of the dispersion-type film to the transparent substrate, the transparency and mechanical properties of the dispersion-type film itself are not substantially impaired. More preferably, it is preferably 30 to 98%, more preferably 50 to 95% by mass in the dispersion type membrane.

On the other hand, the above-mentioned deposition type film deposits the above metal oxide directly on the surface of the transparent substrate. (For example, by vapor deposition such as vacuum evaporation or sputtering). The thickness of this deposition type film is 0.01 to 10 m, and further 0.05 to 1 / m. It is preferred that

(Aspect of optical filter)

The filter for PDP of the present invention is integrated with the PDP as a so-called “separate” filter (available in the market independently of the PDP) or as one of the components of the PDP panel. It can be used in any of the above embodiments.

In the former case, that is, in the embodiment in which the filter is used as a filter substrate of a separate filter, it is possible to use the filter composed of only a transparent substrate having a selective absorption function of near infrared rays as described above, but it is necessary. Depending on the application, known processing such as electromagnetic wave shielding, antistatic coating, anti-reflective coating, hard coating to prevent surface abrasion, etc. can be applied to composite or laminated It may be.

(Integrated with PDP)

The filter of the present invention is used in a mode in which it is a part of the panel components by using a method such as coating or bonding on the front (visible light transmitting side) glass surface constituting the PDP panel. Is also good. Also in this case, a function such as an electromagnetic wave shield other than the near-infrared absorption function described above may be added as necessary.

Referring to FIG. 3, which is a schematic perspective view showing an example of a basic configuration of a DC type (corresponding to one cell), this discharge cell 10 is composed of a pair of opposing electrodes (a cathode 1 la serving as a transparent electrode and an anode 1). lb) is inserted therein, and gas (not shown) is sealed between the pair of electrodes 1 la and 1 lb. In the embodiment of FIG. 3, the phosphor 12 (in the case of a color PDP) arranged in the cell is excited by ultraviolet rays based on the gas discharge, and visible light is emitted from the front side of the cell. Because of the DC type, the cathodes 1 la and 11 b are exposed to the discharge space. The cathode electrode 11 a is disposed on a front (visible light transmitting side) glass 13, while the electrode 11 b is disposed on a rear glass 14. In the embodiment of FIG. 3, the optical filter of the present invention, that is, at least a transparent substrate made of a polymer containing divalent copper ions and / or a near-infrared absorbing dye is included, and the visible light transmittance ( A filter (not shown) having a ratio (Τν / Τη) between Tv) and 800-: near infrared transmittance (Tn) of L 000 nm is 3 or more is arranged on the surface glass 13.

On the other hand, referring to FIG. 4, which is a schematic perspective view showing an example of the basic configuration of an AC type (corresponding to one cell), this discharge cell 20 is composed of a pair of opposing electrodes (a display electrode 21a as a transparent electrode, and an address). An electrode 21b) is provided therein, and a gas (not shown) is sealed between the pair of electrodes 21a and 2 lb. Also in the embodiment of FIG. 4, the phosphor 22 disposed in the cell is excited by the ultraviolet light based on the gas discharge, and visible light is emitted from the front side of the cell. Because of the AC type, the pair of electrodes 2 la and 2 lb described above are not exposed to the discharge space, and are covered by the dielectric layer 25 or the phosphor 22, respectively.

The display electrode 21a is disposed on a surface (visible light transmitting side) glass 23, while the address electrode 21b is disposed on a rear glass 24. In the embodiment of FIG. 4, the optical filter of the present invention, that is, at least a transparent substrate composed of a polymer containing divalent copper ions and / or near-infrared absorbing dyes, Ratio between transmittance (Tv) and near infrared transmittance (Tn) of 800-100 Onm

One filter (not shown) having (Tv / Tn) of 3 or more is arranged on the front glass 23.

(PDP filled gas)

The gas to be filled in the PD Ρ discharge cell can be appropriately selected from publicly known PD ガスガス gas (combination of two or more if necessary), but from the viewpoint of stability during discharge. , Noble gases (He, Ne, Ar, Kr, Xe, etc.) Two or more types can be used in combination. Considering other characteristics such as emission characteristics and ultraviolet radiation characteristics, Ne, Ne—Ar, Ne-Xe for monochromatic PDPs; Ne-Xe for i-color PDPs; He— for multicolor or full-color PDPs X e can be suitably used. In the present invention, a mixed gas containing xenon such as He—Xe or Ne—Xe can be particularly preferably used from the viewpoint of matching with the permeability of the filter.

Fig. 5 shows an example of the emission characteristics of Xe gas (xenon 'in a short arc lamp). As shown in Figure 5, xenon gives emission spectra at 500 nm, 840 nm, 920 nm, and 930 nm.

In the present invention, the filling gas pressure is not particularly limited. The gas pressure may vary slightly depending on the electrode spacing of the panel, but usually about 200 to 600 torr (more about 200 to 300 torr) for AC type PDP, and about 100 to 600 torr for DC type PDP (more Is about 200 to 300 torr), and a pressure of about several orr is suitably used in the plasma cathode.

Hereinafter, the present invention will be described more specifically with reference to examples. In the following examples, "parts" are parts by mass.

Example

Example 1

(Manufacture of Filter Base Using Phosphate Ester Having Polymerizable Functional Group) 10 parts of a phosphoric acid group-containing monomer represented by the following formula (Chemical Formula 5) and represented by the following formula (Idani 6) 10 parts of a phosphoric acid group-containing monomer, 58.5 parts of methyl methacrylate (MMA), 20 parts of diethylene glycol dimethacrylate (DEGDMA; a crosslinkable monomer), and 1-methylstyrene (hi-mSt) 1 And 5 parts were sufficiently mixed (about 10 minutes) to obtain a mixed monomer. Next, copper benzoate anhydride (CB) is added to this mixed monomer.

After adding 14 parts (the content of divalent copper ions is 2.9 parts per 100 parts of the mixed monomer), the mixture is thoroughly mixed and stirred at 60 ° C to dissolve the anhydrous copper benzoate in the mixed monomer. Is A monolithic composition comprising

(Formula 5)

H ₂ C = C-CH3 0 H ₃ CC = CH ₂

I II I

C-0-C2H4-0-P-0-C2 H4-0-C

II I II

O OH O

(Formula 6)

H2C = C-CH ₃ O

I II

CO-C2H4 -OP-OH O OH

To the monomer composition prepared as described above, 2.0 parts of t-butylvaloxybivalate (reaction initiator) was added, and the mixture was poured into a glass mold. The mixture was poured at 45 ° C for 16 hours, and then at 60 ° C for 8 hours. By heating at 90 ° C for 3 hours and successively at different temperatures in the past, casting was performed to obtain a 1.6 mm thick plate-like cross-linked fl-polymer containing divalent copper ions. A filter substrate (transparent substrate) was obtained.

The spectral transmittance of the film substrate obtained above was measured using a spectrophotometer (trade name: U-4000, manufactured by Hitachi, Ltd.). Based on this measurement data, the visible light transmittance Tv (Equation 1) and the near-infrared light transmittance (Τη) were calculated by the above-described definitions, and the Τν / Τη ratio was obtained. The results obtained by the calculation are shown below (Table 2).

(Table 2)

Composition

Examples Polymer

DEG Tv / Tn Numbering A Conversion B Marauder A -m5c CB

DMA Open column Yes

Quantity mh

1 10 10 58.5 20 1.5 14 2 2.9 1.6 53

2 5 5 68.5 20 1.5 7 2 1.4 1.6 15

3 2.5 2.5 73.5 20 1.5 3.5 2 0.7 3 4.5

4 25 25 28.5 20 1.5 45 2 9.3 0.5 61

5 30 30 18.5 20 1.5 54 2 11.2 0.3 58

6 1.5 1.5 75.5 20 1.5 2.1 2 0.44 8.0 7

Examples 2 to 6

Except that the composition ratio of each component of the monomer composition was changed as shown in the above (Table 2), the same raw materials as in Example 1 were used, and divalent in the mixed monomer was obtained in the same manner. By changing the copper ion content and the thickness of the crosslinked polymer after polymerization, a sample of the film substrate was prepared.

The Tv / Tn ratio of the film substrate obtained above was determined in the same manner as in Example 1. The results obtained are summarized in the above (Table 2).

Example 7

(Production of a filter substrate using a phosphate ester having no polymerizable functional group) 100 parts of isobonyl methacrylate (i-BoMMA) and 9.06 parts of di-2-ethylhexyl phosphate (DEHAP) After thorough mixing, 2.04 parts of anhydrous copper acetate (CA) (0.71 part of divalent copper ions with respect to 100 parts of the mixed monomer) was added to the mixed monomer. The mixture was thoroughly stirred at ° C to obtain a composition in which copper acetate was dissolved in the mixed monomer.

To the monomer composition prepared as described above, 2.0 parts of t-butyl peroxybiparate, a polymerization initiator, was added, and the mixture was poured into a glass mold.Then, the mixture was added at 45 ° C for 16 hours, and then at 60 ° C for 8 hours. By heating at 90 ° C for 3 hours and then sequentially at different temperatures for 3 hours, cast polymerization is carried out to obtain a 3 mm-thick plate-shaped filter substrate made of a polymer containing divalent copper ions. Obtained. The film substrate thus obtained was thermoplastic and melted and deformed by a 200-degree heat breath.

For the filter substrate obtained above, the spectral transmittance of the filter-substrate sample was measured using a spectrophotometer in the same manner as in Example 1, and the visible light transmittance (TV) and near-infrared transmittance were measured. (Tn) and Tv / Tn were determined. The results obtained are summarized in the following (Table 3).

Example 8-Instead of 100 parts of isobornyl methacrylate used in Example 7, 50 parts of chilume acrylate (t-BuMMA), 50 parts of methyl methacrylate (MMA), 4.53 parts of DEHAP, 1.0 part of anhydrous copper acetate (CA), and IE combined thickness of 7 A filter-substrate was obtained in the same manner as in Example 7, except that mm was used. The polymer thus obtained was thermoplastic.

The Tv / Tn value of the filter base obtained as described above was determined in the same manner as in Example 1. The results obtained are summarized below (Ecchi 3).

Example 9

(Production method of PC88 A—Cu complex)

MONO 2-ethylhexyl 2-ethylhexylphosphonate (trade name: PC-88A, manufactured by Daihachi Chemical Co., Ltd.) 612 parts, 181 parts of anhydrous copper acetate, and 100 parts of toluene are sufficiently mixed and stirred at 80 ° C. Then, anhydrous copper acetate was completely dissolved in PC88A.

Subsequently, the thus-obtained solution of anhydrous copper acetate / PC88A was thoroughly mixed and stirred with 1000 parts of water, and allowed to stand. After removing the aqueous layer, the organic layer was washed with water. Further, this washing operation was repeated until the PH of the aqueous layer (obtained by standing after washing) became 6.5 or more.

Next, the dissolved solution after the above-mentioned water washing is gradually poured into an excessive amount of acetone, and precipitates insoluble in acetone are collected by filtration, and then the solvent (acetone) is dried and removed in a vacuum dryer. As a result, a copper ion (PC88A-Cu) complex of PC88A was obtained.

(Polymer production method)

A monomer composition (t-butyl methacrylate) was prepared using 55 parts of t-butyl methyl acrylate (t-BuMMA), 45 parts of methyl methacrylate (MMA), and 5 parts of PC88A-Cu used in Example 7. A filter substrate was obtained in the same manner as in Example 7 except that 2.0 parts of butyl peroxyvivalate was added; the same as in Example 7), and the thickness of the polymer was changed to 3 mm. . The obtained polymer was thermoplastic. The Tv / Tn value of the filter base obtained as described above was determined in the same manner as in Example 1. The results obtained are summarized below (Table 3).

: Table 3)

Example 1 o

(Example of manufacturing filter-substrate using near-infrared absorbing dye)

Metal complex NIR absorbing dye SIR-128 (trade name, manufactured by Mitsui Bunatsu Chemical Co., Ltd.) 0.02 parts in 100 parts of acrylic resin (trade name, Sumipex MHGA, manufactured by Sumitomo Chemical Co., Ltd.) The mixture was sufficiently mixed (about 5 minutes) using a hot roll at a temperature of 200 ° C.

The mixture obtained above was formed into a 2 mm-thick filter-substrate using a hot press having a surface temperature of 200 ° C.

The Tv / Tn value of the film substrate obtained above was determined in the same manner as in Example 1. The results obtained are summarized below (¾4).

Example 1 1

0.015 parts of each of the metal complex-based near infrared absorbing dye SIR-128 and the metal complex-based near infrared absorbing dye SIR-130 (trade name, manufactured by Mitsui Toatsu Chemicals) are replaced with 100 parts of acrylic resin (Sumitomo Chemical Co., Ltd.). And trade name: SUMIPEX MHGA) using a hot roll with a surface temperature of 200 ° C.

The mixture obtained above was used to obtain a filter-substrate having a thickness of 2 mm using a hot press having a surface temperature of 200 ° C.

The Tv / Tn value of the filter base obtained as described above was determined in the same manner as in Example 1. The results obtained are summarized in the following (Table 4).

Example 12

Metal complex type near infrared absorbing dye MIR (trade name: Mitsui Toatsu Chemicals) 0.5 part, adhesive containing 50% acrylic resin (trade name: TS-15, manufactured by Sekisui Chemical Co., Ltd.) as adhesive Solution (Ethyl acetate-toluene mixed solvent, mixing ratio = 50:50 mass ratio) After dissolving in 100 parts, coat on a 50〃m thick polyester film (trade name: Lumirror # 50, manufactured by レ le Corporation). Then, the sample was dried at 60 ° C. for 120 minutes to obtain a sample of a film substrate having an adhesive layer thickness of 30 m. A sample for measurement was obtained by laminating the thus obtained film sample on a 1 mm thick glass at 20 ° C using a rubber roller.

The Tv / Tn value of the film substrate obtained above was determined in the same manner as in Example 1. The results obtained are summarized in the following (Table 4).

(Table 4)

Composition

Example

Thickness Tv / Tn No.Acrylic resin SIR-128 SIR-130 MIR

10 100 0.02 2 5.5

11 100 0.015 0.015 2 5 Resin solution

12 (resin 50%) 0.5 0.03 4 100

Example 13

Mix well 100 parts of isobonyl methacrylate (i-BoMMA) and 9.06 parts of diethyl hexyl phosphate (DEHAP), and add anhydrous copper acetate (CA) to the monomer mixture. After adding 04 parts (0.71 parts of divalent copper ion containing M to 100 parts of monomer), mix and stir thoroughly at 60 ° C (about 120 minutes) to convert copper acetate into a mixed monomer. A dissolved monomer composition was obtained.

To the monomer composition obtained above, 0.02 parts of a metal complex-based near-infrared absorbing dye MIR (trade name, manufactured by Mitsui Toatsu Chemicals, Inc.) was added, followed by stirring and mixing to obtain a divalent compound. A solution was obtained in which copper ions and a near-infrared absorbing dye were dissolved and dispersed in the mixed monomer.

The solution thus obtained was polymerized in the same manner as in Example 7 to obtain a plate polymer having a thickness of 3 mm.

In the same manner as in Example 1, the spectral transmission curve of the platy polymer obtained above was measured, and the Tv / Tn of the polymer was determined from the curve, whereby Tv / Tn = 8.4. Industrial applicability

As described above, according to the present invention, there is provided a filter including at least a transparent substrate made of a polymer containing a near-infrared absorbing component, wherein the near-infrared absorbing component is a divalent copper ion and / or a near-infrared ray. An optical device for a plasma display comprising an absorbing dye, wherein the ratio (Τν / Τη) of the visible light transmittance (Τν) as a filter to the near infrared transmittance (Τη) of 800 to 1000 nm is 3 or more. Phil Yuichi is offered.

According to the present invention, further, at least one discharge cell having a pair of electrodes facing each other therein, and filling a gas between the pair of electrodes,

An optical filter disposed on the visible light transmitting side of the discharge cell; and the optical filter contains divalent copper ions and / or a near-infrared absorbing dye. At least one transparent substrate consisting of a transparent polymer; the ratio (Τν / Τη) between the visible light transmittance (Tv) as the filter and the near-infrared transmittance (800η) from 800 to 1000 nm A plasma display device having three or more is provided. By disposing the filter of the present invention having the above-mentioned near-infrared selective cut function in front of the PDP or by integrating it with the PDP as in the PDP apparatus of the present invention, an excellent display of the PDP can be obtained. It is possible to realize a PDP that minimizes near-infrared rays, which may adversely affect the human body, without substantially impairing functions or characteristics.

Claims

The scope of the claims

1. A transparent substrate made of a polymer containing a near infrared absorbing component

A filter that includes at least

The near-infrared absorbing component comprises a divalent copper ion and / or a near-infrared absorbing dye, and has a visible light transmittance (Tv) as a filter and a near infrared transmittance (Tn) of 800 to 1000 nm. An optical filter for a plasma display, wherein the ratio (Τν / Τη) of the optical filter is 3 or more.

2. The film according to claim 1, wherein the polymer is an acrylic polymer.

3. The near-infrared absorbing component is a divalent copper ion.

Phil Yuichi.

4. The near-infrared absorbing component is a near-infrared absorbing dye.

Phil Yuichi on the list.

5. The near-infrared absorbing component is divalent copper ion and near-infrared absorbing

2. The filter according to claim 1, which is a dye.

6. The transparent substrate according to claim 1, further comprising a metal oxide.

The filter of ο

7. A layer containing a metal oxide is further disposed on the transparent substrate.

The claim 1 according to claim 1.

8. A pair of electrodes facing each other is provided inside, and a gas is

At least one of the discharge cells

An optical filter disposed on the visible light transmitting side of the discharge cell; and wherein the optical filter is a transparent substrate comprising a polymer containing a divalent copper ion and / or a near-infrared absorbing dye. And the visible light transmittance (Tv) as a filter, the near infrared transmittance (Tn) of 800 to 1000 nm and © i (Tv / Tn) are 3 or more. Plasma display device _c

9. The gas sealed in the cell is xenon gas or xenon 9. The plasma display device according to claim 8, which is a mixed gas containing:

10. The plasma display device according to claim 8, wherein a phosphor is disposed inside the discharge cell.