JPH11231106A - Optical filter for plasma display and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently suppress radiation of near IR rays, to prevent malfunction of peripheral devices and to obtain a sharp image by incorporating a specified amine compd. and a specified nickel complex compd. into a transparent resin film or sheet. SOLUTION: A transparent resin film or sheet contains an amine compd. expressed by formula I and a nickel complex compd. expressed by formula II. In the formulae, Y is a halogen atom, ClO4 , SbF6 , BF4 or NO3 , n is an integer of 1 or 2, R<1> to R<4> are independently hydrogen atoms or methoxy groups. The optical filter is formed on a glass plate or a plastics plate. As for the transparent resin, an acrylic resin, polyvinyl chloride resin, polyester resin, triacetate resin or the like can be used. The concn. of the compd. expressed by formula I to be used is preferably 0.05 to 0.5 g/m<2> . The concn. of the compd. expressed by formula II to be used is preferably 0.07 to 1.07 g/m<2> .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical filter for a plasma display and a method for manufacturing the same.

[0002]

2. Description of the Related Art A plasma display is an apparatus using a fluorescent material that emits visible light, and simultaneously emits near-infrared light that is emitted toward a display observer.
However, since many data communications using infrared rays and remote controls for home appliances use this near-infrared light, if a plasma display that emits near-infrared light is turned on, data communications using infrared rays and remote control This may cause malfunctions or malfunctions. Therefore, these devices could not be used in a place where a plasma display is used.

On the other hand, when a commercially available infrared shielding material such as an infrared absorbing glass is placed on the front of the plasma display to prevent malfunction, there are problems such as a change in the color tone of the screen and a decrease in image quality due to a decrease in luminance. .

For example, tungsten compounds and phthalocyanine compounds are known as dyes that absorb near-infrared rays. Plastic plates containing these dyes can also be manufactured, but in this case, the absorption of visible light is strong. Is the problem.

[0005] The plasma display also emits electromagnetic waves. For this reason, in order to satisfy the standards of the Electrical Appliance and Material Control Law and the Voluntary Control Council for Interference by Information Technology Equipment (VCCI), some electromagnetic shielding may be required.
However, it is difficult with the current technology to perform this electromagnetic shielding on the plasma display body, and it has been desired to solve the problem by placing a filter on the front surface.

[0006] Further, since the plasma display is mainly used for hanging on a wall or the like and the screen is larger than that of a general CRT, the image quality is liable to be deteriorated by the reflection of external light, and the surface of the surface is easily damaged. Antireflection treatment was desired.

Further, since the plasma display screen and its front panel attract dust due to static electricity, a front panel having antistatic performance has been desired for the purpose of preventing the dust.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to efficiently suppress near-infrared radiation when a plasma display is used, without causing malfunction such as malfunction of peripheral devices.
An object of the present invention is to provide an optical filter capable of clearly seeing a screen of a plasma display and a method of manufacturing the same.

Another object of the present invention is to provide an optical filter having both electromagnetic shielding performance, antireflection performance and antistatic performance, and a method of manufacturing the same.

[0010]

The object of the present invention is to provide a plasma in which an amine compound represented by the formula (1) and a nickel complex compound represented by the formula (2) are contained in a transparent resin film or sheet. The problem is solved by an optical filter for a display and a manufacturing method thereof.

[0011]

Embedded image

Wherein Y is a halogen atom, ClO ₄ , Sb
F ₆ , BF ₄ , or NO ₃ . N is 1 or 2
Is an integer.

[0013]

Embedded image

However, R ¹ , R ² , R ³ and R ⁴ are each independently a hydrogen atom or a methoxy group.

These optical filters can have a structure formed on a glass plate or a plastic plate.

Each of these optical filters may have a structure in which a conductive thin film layer or an antistatic layer is formed alone or simultaneously on at least one surface or inside as required. Furthermore, a structure in which an antireflection layer is formed on at least one surface of each of these optical filters can be employed.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The amine compound represented by the formula (1) has a property of strongly absorbing near-infrared rays in the 900 to 1100 nm region and transmitting visible light with high efficiency. The nickel complex compound represented by the formula (2) has a property of strongly absorbing near-infrared light in the 800 to 900 nm region and transmitting visible light with high efficiency.

On the other hand, near infrared rays of 800 to 1100 nm are generally used for infrared communication of home electric appliances and the like. Therefore, by mounting an optical filter containing the amine compound and the nickel complex compound on a plasma display, it is possible to prevent near infrared rays from being emitted from the plasma display, and as a result, infrared rays from home appliances and the like were used. Malfunctions such as data communication can be prevented.

The concentration of the compound represented by the formula (1) is 0.0
It is preferably from ⁵ to 0.5 g / m ² . If the content is too small, the near infrared absorption ability is insufficient and the effect of preventing malfunctions for data communication using infrared rays is insufficient,
On the other hand, if the content is too large, the transmittance in the visible light region is reduced, and the display screen is not clear.

The concentration of the compound represented by the formula (2) is 0.0
It is preferably from 7 to 1.07 g / m ² . If the content is too small, the ability to absorb near-infrared rays is insufficient, and the effect of preventing malfunction of the remote control becomes insufficient. On the other hand, if the content is too large, the transmittance in the visible light region is reduced, and the display screen becomes unclear.

Examples of the transparent resin in the present invention include an acrylic resin, a polyvinyl chloride resin, a polyester resin, and a triacetate resin. From the viewpoint of transparency, a homopolymer of methyl methacrylate or 80 weight% of methyl methacrylate is used. % Is particularly preferable.

A transparent resin film or sheet containing an amine compound and a nickel complex compound can be obtained by a known production method using a transparent resin as a raw material.
That is, a method of mixing these compounds in a transparent resin and extruding the mixture by heating, shaping, a method of previously dissolving these compounds in a raw material for polymerization and shaping by template polymerization, and a method of forming a solution containing the transparent resin and these compounds on a substrate. A casting method in which the solvent is cast thereon to evaporate the solvent is exemplified.

As the conductive thin film layer, a silver thin film, a laminated film of indium oxide (ITO) and silver, an indium oxide (ITO)
O) a thin film, a thin film of Cu and / or Ni, and the like. This conductive thin film layer is not necessarily required to be formed on the entire surface of the optical filter in order to exhibit its function, and a portion where the thin film layer is formed and a portion where the thin film layer is not formed are alternately present. Can also. This conductive thin film layer can be formed on the surface or inside of a transparent resin film or sheet.

These thin films can be formed by a dry film forming method such as vacuum evaporation, sputtering, or ion plating, or a wet plating method. Further, a method of bonding or press-bonding the thin film itself on a substrate such as a transparent resin plate can also be applied. Further, a method of laminating a sheet, a film, a fiber or the like on which a conductive thin film layer is formed on an optical filter can also be adopted. When fibers are used, a filter is manufactured in which portions on which the conductive thin film layer is formed and portions on which the conductive thin film layer is not formed are alternately present.

An optical filter for a plasma display having a conductive thin film layer formed therein is formed, for example, by forming a conductive thin film layer on the surface of a transparent resin film or sheet by the above-described method, and then forming the transparent resin film or It can be manufactured by laminating a sheet (with or without an amine compound and a nickel complex compound), a glass plate or a plastic plate on the surface on which the conductive thin film layer is formed.

As a method of laminating both, there is a method of sticking and adhering using a commercially available transparent adhesive or adhesive. In the case of a plastic plate, a method of laminating by thermocompression bonding is also possible.

The antistatic layer is a layer having electrical conductivity, and includes a thin film layer in which fine particles of a conductive metal oxide such as tin oxide are finely dispersed in a synthetic resin and a thin film layer containing a surfactant. Examples of the surfactant include an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant, and the like. Examples of the surfactant include a method of directly applying a liquid containing these to a sheet or a film. A thin film layer can be formed. This antistatic layer can also be formed on the optical filter for a plasma display on which the conductive thin film layer is formed. This antistatic layer can be formed on the surface or inside the optical filter for a plasma display in the same manner as in the case of the conductive thin film layer.
In addition, when it is formed inside, it is preferable to form it as close to the surface as possible in order to better exhibit the antistatic effect.

Examples of the antireflection layer include an antireflection film in which inorganic compound thin films such as silicon dioxide, titanium oxide, magnesium fluoride, and cerium oxide are singly or appropriately laminated, and an antireflection film made of a fluororesin thin film. In addition, a structure in which an uneven shape is formed on the surface of the optical filter for a plasma display can be formed and used as an antireflection layer. These antireflection layers can be formed by a dry film forming method such as vacuum evaporation, sputtering, or ion plating, or a wet coating method. This antireflection layer can also be formed on the optical filter for a plasma display on which the conductive thin film layer and the antistatic layer are formed.

The method for producing a transparent resin film or sheet containing an amine compound and a nickel complex compound in the present invention includes those exemplified above. Among them, the casting method that can be manufactured at a low temperature is most preferable in order to avoid the influence of the heat history at the time of manufacturing. Solvents used in the casting method include tetrahydrofuran, dimethylformaldehyde,
What dissolves a transparent resin such as chloroform easily is preferable.

Examples of the substrate used in the casting method include a stainless steel plate, a glass plate, a polyethylene terephthalate resin film or plate, a triacetate resin film or plate, and an acrylic resin film or plate. This substrate can be transparent or opaque.

After casting the above solution on these substrates and evaporating the solvent, the solution is peeled off from the substrates to produce a transparent resin film or sheet containing an amine compound and a nickel complex compound. The transparent resin film or sheet thus obtained can be used alone as a filter, or can be used by laminating it on a glass plate or a plastic plate.

When a transparent substrate is used in the casting method, depending on the type of the substrate and the type of the solvent, a solution is cast on the substrate to evaporate the solvent, and a film or a film containing an amine compound and a nickel complex compound is formed. A sheet and a substrate integrated with each other can be used as the optical filter of the present invention. When the substrate is thin, a substrate laminated on a glass plate or a plastic plate can be used as the optical filter of the present invention.

[0033]

The present invention will be described below with reference to examples.

Example 1 A compound in which Y in the formula (1) is ClO ₄ and n is 2 is 0.0176 parts by weight based on 100 parts by weight of an acrylic resin [Acrypet (registered trademark) VH manufactured by Mitsubishi Rayon Co., Ltd.] And 0.0185 parts by weight of a compound having R ^{1 to} R ⁴ in the formula (2), each of which was a methoxy group, were added and uniformly mixed, and then formed into a sheet having a thickness of 1 mm by a heat extrusion method. The content of each compound in the sheet was 0.2% for the compound of formula (1).
1 g / m ² , and the compound of the formula (2) was 0.22 g / m ² .

When the spectral transmittance of this sheet was measured, the transmittance was 10% or less in the region of 810 to 1130 nm, and the transmittance was 70% in the visible light region of 430 to 680 nm.
% Or more.

When this optical filter was mounted on the plasma display and the plasma display was turned on, no malfunction occurred in the plasma display main body, the remote control of the peripheral device, and the infrared data communication of the peripheral device, and the screen was clear.

Example 2 A 90-mesh woven fabric made of polyester fiber, which had been subjected to copper plating and nickel plating, was thermocompression-bonded onto one surface of the optical filter of Example 1.

The optical filter thus obtained is
The transmittance in a region of 810 to 1130 nm is 10% or less, and the transmittance in a visible light region of 430 to 680 nm is 49%.
% Or more. Further, the electromagnetic wave shielding property of this filter was 48 dB at 200 MHz. When this optical filter was evaluated in the same manner as in Example 1, no malfunction occurred in the remote control and the screen was clear.

Example 3 A cationic surfactant [Staticite GP manufactured by Takihara Sangyo Co., Ltd.] was applied to both surfaces of the optical filter of Example 2.

The optical filter thus obtained is
The transmittance in a region of 810 to 1130 nm is 10% or less, and the transmittance in a visible light region of 430 to 680 nm is 49%.
% Or more. The surface resistance of this optical filter is 5
At 0% RH, it was 1 × 10 ¹² Ω / □, and even after triboelectric charging, it did not attract surrounding dust. The electromagnetic wave shielding property was 48 dB at 200 MHz. When this optical filter was evaluated in the same manner as in Example 1, no malfunction occurred in the remote control and the screen was clear.

Example 4 A polyester film having a thickness of 12 μm and an anti-reflection film (three-layer film formed by laminating silicon oxide / titanium oxide / silicon oxide in this order) formed on one side of the polyester film, The optical filter of Example 3 was laminated on both sides using an adhesive.

The optical filter thus obtained is
The transmittance in the region of 810 to 1130 nm is 10% or less, and the transmittance in the visible light region of 430 to 680 nm is 52%.
% Or more. The surface reflectance is 430 to 680 nm.
Is less than 1% in the range, and the electromagnetic wave shielding property is 200M.
Hz was 48 dB. Example 1
When the evaluation was performed in the same manner as described above, no malfunction occurred in the remote control, and the screen was clear.

Example 5 100 parts by weight of acrylic resin Acrypet VH was added to 500 parts by weight of tetrahydrofuran, and Y in the formula (1) was used.
Is a ClO ₄ group, 0.392 parts by weight of a compound having n of 2, and 0.411 parts by weight of a compound having R ^{1 to} R ⁴ in the formula (2) each having a methoxy group are uniformly dissolved. After being formed into a film having a thickness of 45 μm on a stainless steel plate, the film was peeled off. The content of each compound in the film was 0.21 g / m ^{2 for} the compound of formula (1) and 0.22 g / m ² for the compound of formula (2).

When the spectral transmittance of this film was measured, the transmittance was 10% or less in a region of 810 to 1130 nm, and the transmittance in a visible light region of 430 to 680 nm was 7%.
0% or more.

After this film was attached to a 3 mm thick tempered glass using an adhesive, the film was mounted so that the film side became the plasma display main body side, and the evaluation was performed in the same manner as in Example 1. No screen occurred and the screen was clearer than in Example 1.

Example 6 A 90-mesh polyester fiber woven fabric plated with copper and nickel was thermocompression-bonded on the film of the optical filter of Example 5.

The optical filter thus obtained is
The transmittance in a region of 810 to 1130 nm is 10% or less, and the transmittance in a visible light region of 430 to 680 nm is 49%.
% Or more. Further, the electromagnetic wave shielding property of this filter was 48 dB at 200 MHz. When this optical filter was evaluated in the same manner as in Example 1, no malfunction occurred in the remote control and the screen was clear.

Example 7 A cationic surfactant [Statistite GP manufactured by Takihara Sangyo Co., Ltd.] was applied to the surface of the optical filter of Example 6 to which the film and mesh were not attached.

The optical filter thus obtained is
The transmittance in a region of 810 to 1130 nm is 10% or less, and the transmittance in a visible light region of 430 to 680 nm is 49%.
% Or more. The surface resistance of the surface of the optical filter coated with a cationic surfactant is 1 × 1 at 50% RH.
0 ¹² Ω / □, and did not attract surrounding dust even after triboelectric charging. The electromagnetic wave shielding property is 2
It was 48 dB at 00 MHz. When this optical filter was evaluated in the same manner as in Example 1, no malfunction occurred in the remote control and the screen was clear.

Example 8 A polyester film having a thickness of 125 μm, on which an antireflection film (three-layer film formed by laminating silicon oxide / titanium oxide / silicon oxide in this order) was formed on one side, Using an adhesive, the optical filter of Example 7 was laminated on the surface on which the film and mesh were not attached.

The optical filter thus obtained is
The transmittance is 10% or less in the region of 810 to 1130 nm, and the transmittance in the visible light region of 430 to 680 nm is 50%.
% Or more. The surface reflectance is 430 to 680 nm.
Is 3% or less in the range, and the electromagnetic wave shielding property is 200M.
Hz was 48 dB. Example 1
When the evaluation was performed in the same manner as described above, no malfunction occurred in the remote control, and the screen was clear.

Comparative Example 1 Evaluation was made without mounting a filter on the plasma display in Example 1. As a result, the screen could be seen clearly, but the remote controller did not operate normally.

Comparative Example 2 A compound in which Y in the formula (1) is a ClO ₄ group and n is 2 was added to 100 parts by weight of an acrylic resin acrylpet VH.
After adding 0370 parts by weight and uniformly stirring, the mixture was shaped into a sheet having a thickness of 1 mm by a heat extrusion method. The content of the compound of the formula (1) in the obtained sheet was 0.44 g / m ² .

When the spectral transmittance of this sheet was measured, the transmittance was 10% or less in the region of 900 to 1150 nm, and the transmittance in the visible light region of 430 to 680 nm was 70%.
% Or more. When the optical filter was mounted on the plasma display and the plasma display was turned on, the screen could be seen clearly, but a malfunction occurred in the remote control of some peripheral devices.

Comparative Example 3 0.0244 parts by weight of a compound of the formula (2) in which each of R ^{1 to} R ⁴ was a methoxy group was added to 100 parts by weight of acrylic resin Acrypet VH, mixed uniformly, and then heated and extruded. It was shaped into a 1 mm thick sheet. The content of the compound of the formula (2) in the sheet was 0.29 g / m ² .

When the spectral transmittance of this sheet was measured, the transmittance was 10% or less in the region of 780 to 870 nm, and the transmittance was 70% in the visible light region of 430 to 680 nm.
% Or more. When the optical filter was mounted on the plasma display and the plasma display was turned on, the screen could be seen clearly, but a malfunction occurred in the remote control of some peripheral devices.

COMPARATIVE EXAMPLE 4 0.02% of a phthalocyanine-based near-infrared absorbing dye was mixed with an acrylic resin Acrypet VH, and formed into a sheet having a thickness of 3 mm by a heat extrusion method. This sheet is 870
The transmittance in nm was 30%, and the transmittance in the visible light region of 450 to 680 nm was 40% or more. When this optical filter was evaluated in the same manner as in Example 1, the image was unclear in a room with fluorescent light illumination because the screen was dark, and the remote control did not operate normally.

[0058]

By mounting the optical filter of the present invention on a plasma display, it is possible to prevent malfunctions of peripheral devices such as a remote controller such as a VTR, an air conditioner, a fluorescent lamp and an optical communication computer without deteriorating the image quality. . Further, the optical filter of the present invention can effectively prevent various obstacles due to electromagnetic waves, a reduction in the sharpness of the screen due to reflected light, and dust attracted by static electricity, so that the plasma display can be used in these environments. From the viewpoint of heat history, an optical filter obtained by a casting method that can be manufactured at a low temperature is more useful.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FIG09F 9/00 318 H01J 11/02 Z H01J 11/02 C09B 57/00 Z // C09B 57/00 57/10 57/10 67 / 22 F 67/22 F21V 9/04 F21V 9/04 G02B 1/10 Z

Claims (8)

[Claims] 1. An optical filter for a plasma display comprising a compound represented by the formula (1) and a compound represented by the formula (2) in a film or sheet made of a transparent resin. Embedded image Here, Y is a halogen atom, ClO ₄ , SbF ₆ , BF ₄ ,
Or NO ₃ . N is an integer of 1 or 2. Embedded image However, R ¹ , R ² , R ³ and R ⁴ are each independently a hydrogen atom or a methoxy group. 2. The optical filter according to claim 1, wherein the transparent resin is an acrylic resin. 3. The optical filter according to claim 1, wherein the compound represented by the formula (1) is contained in an amount of 0.05 to 0.1.
5 g / m ² and the compound represented by the formula (2) are 0.07 to 1.
An optical filter containing 07 g / m ² . 4. An optical filter for a plasma display, wherein the optical filter according to claim 1 is formed on a glass plate or a plastic plate. 5. An optical filter according to claim 1, wherein a conductive thin film layer is formed on at least a part of the surface or inside of the optical filter. 6. An optical filter according to claim 1, wherein an antistatic layer is formed on at least one surface or inside of the optical filter. 7. An optical filter according to claim 1, wherein an anti-reflection layer is formed on at least one surface of the optical filter. 8. A compound represented by the formula (1) and a compound represented by the formula (2):
The method for producing an optical filter according to any one of claims 1 to 7, wherein after dissolving the compound represented by (1) and the transparent resin in a solvent, the solution is cast on a substrate and the solvent is evaporated.