JPH1187988A - Front panel for plasma display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front panel which can effectively shield electromagnetic waves generated from the screen of a plasma display and can be comparatively simple manufactured. SOLUTION: In this front panel, two or more conductive films 41, 42 wherein transparent conductive layers 31, 32 are formed on one surfaces of polymer films 21, 22 are laminated on a transparent substrate 1. Two or more conductive films are laminated on at least one surface of the transparent substrate. A first conductive film, wherein a transparent conductive layer is formed on one surface of the polymer film, is laminated on at least one surface of the transparent substrate, in such a manner that the transparent conductive layer is arranged outside. A second conductive film, wherein a transparent conductive layer is formed on one surface of the polymer film is laminated on the transparent conductive layer in such a manner that the transparent conductive layer, is arranged outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a front panel for a plasma display.

[0002]

2. Description of the Related Art A plasma display has attracted attention as a flat display having a large display area and a flat surface. However, since electromagnetic waves are generated from the screen, it is necessary to shield the electromagnetic waves. In general, as a method for shielding electromagnetic waves from a display, for example, a method has been proposed in which a front plate provided with a conductive layer on a transparent substrate is arranged on the front surface of a cathode ray tube (CRT) (Japanese Patent Publication No. 7-89597). No.). However, since such a front plate needs to form a conductive layer by a method such as vacuum evaporation for each transparent substrate,
There is a problem that a large-sized vacuum evaporation apparatus is required and the manufacturing process is complicated.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present inventors
As a result of intensive studies to develop a front panel that can effectively shield electromagnetic waves generated from the screen of a plasma display and that can be manufactured relatively easily, laminating a conductive film on at least one surface of a transparent substrate The inventors have found that such a problem can be solved by using two or more of the conductive films, and have reached the present invention.

[0004]

That is, the present invention relates to a conductive film in which a transparent conductive layer (31, 32) is formed on one surface of a polymer film (21, 22) on a transparent substrate (1). An object of the present invention is to provide a front panel for a plasma display in which two or more (41, 42) are laminated. One example of the front plate of the present invention is shown in FIGS.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The transparent substrate (1) in the front plate for a plasma display of the present invention is made of, for example, a synthetic resin such as acrylic resin, polycarbonate, polystyrene, and methyl methacrylate-styrene copolymer. Acrylic resins are preferred in that they can be easily processed to the desired size and in terms of transparency. The thickness of such a transparent substrate is usually 0.01 to 10 mm, preferably 0.5 to 10 mm.
Those having a size of about 10 to 10 mm are used. The area is appropriately selected according to the target screen size of the display. Such a transparent substrate may be practically transparent,
It may be colored by a dye, a pigment or the like. Wavelength 4
The light transmittance at 00 to 600 nm is usually 50% or more, preferably 60% or more.

Further, a transparent substrate having a function of shielding near infrared rays generated from the plasma display may be used. In this case, the average light transmittance at a wavelength of 850 to 1000 nm is preferably 10% or less. A transparent substrate having a performance of shielding near-infrared rays is, for example, a monomer containing an unsaturated double bond, a copolymer containing a copolymer of a phosphorus atom-containing monomer, and a resin containing a compound containing a copper atom. Composition (see, for example, JP-A-6-118228), resin composition containing a copper compound and a phosphorus compound (see, for example, Japanese Patent Publication No. 62-5190), resin composition containing a copper compound and a thiourea derivative (For example, see JP-A-6-73197) and a resin composition containing a tungsten-based compound (for example, USP-364772).
See No. 9. ) And the like.

[0007] Such a transparent substrate has a hard coat treatment at least on the surface on which the conductive film is laminated, so that the conductive film and the transparent substrate are hardly peeled off even when exposed to a high temperature from a plasma display for a long time. The effect is remarkable when the transparent substrate is made of an acrylic resin.

The hard coat layer is the same as that usually used, and includes, for example, a layer obtained by polymerizing and curing a polyfunctional monomer or an oligomer thereof. Here, examples of the polyfunctional monomer include an acrylic monomer, a silicon monomer, an epoxy monomer, and a melamine monomer. A hard coat agent such as an acrylic hard coat agent, a silicon hard coat agent, an epoxy hard coat agent, a melamine hard coat agent or the like containing the monomer or its oligomer as a main component is applied, and then polymerized and cured to form a hard coat. A layer is formed.

The acrylic monomer includes, for example, a polymerizable compound having at least two (meth) acryloyloxy groups in a molecule. Specific examples of such a polymerizable compound include, for example, polyhydric alcohol and (meth)
Examples include an ester compound with acrylic acid, a urethane-modified (meth) acrylic oligomer obtained from a compound having an isocyanate group at a terminal and a (meth) acrylic acid derivative having a hydroxyl group.

Examples of polyhydric alcohols include ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, propanediol, butanediol, pentanediol, hexanediol, neopentyl glycol,
Dihydric alcohols such as 2-ethyl-1,3-hexanediol, 2,2'-thiodiethanol, 1,4-cyclohexanedimethanol, trimethylolpropane, pentaglycerol, glycerol, pentaerythritol, diglycerol, dipenta Examples include trihydric or higher alcohols such as glycerol and dipentaerythritol.

Such an ester compound of a polyhydric alcohol and (meth) acrylic acid is used as a mixed ester by further adding a small amount of a polyunsaturated carboxylic acid in order to impart flexibility to the obtained cured film and to prevent cracking. Is also good. Examples of the polyunsaturated carboxylic acid include succinic acid, tetrahydrophthalic acid, phthalic acid, maleic acid, fumaric acid, and itaconic acid.

The urethane-modified (meth) acrylic oligomer can be obtained, for example, by reacting a polyisocyanate and an oligomer having a plurality of hydroxyl groups with a terminal isocyanate polyurethane and a (meth) acrylic acid derivative. Examples of the polyisocyanate include hexamethylene diisocyanate and isophorone isocyanate; examples of the oligomer having a plurality of hydroxyl groups include polycaprolactone diol and polytetramethylene diol; and examples of the (meth) acrylic acid derivative include (meth) acrylic acid-2- Hydroxyethyl,
Examples thereof include hydroxyalkyl (meth) acrylate compounds such as 2-hydroxypropyl (meth) acrylate.

The polyfunctional monomer or oligomer thereof is
For example, after being mixed with an initiator, it is applied on a transparent substrate by a usual method such as spin coating, dip coating, roll coating, gravure coating, curtain flow coating, and then polymerized and cured. Further, it may be applied after being diluted with various solvents. In that case, the solvent is usually volatilized after application and before curing. Upon polymerization and curing, ultraviolet curing, heat curing, electron beam curing, and the like are appropriately selected depending on the polyfunctional monomer or oligomer thereof used.

The thickness of the hard coat layer formed on the surface of the transparent substrate is not particularly limited, but is preferably about 1 to 20 μm. When the thickness is 1 μm or less, interference fringes due to the hard coat layer tend to occur, and when the thickness exceeds 20 μm, the hard coat layer tends to crack. In order to improve the adhesion between the transparent substrate and the hard coat layer, an adhesive layer may be provided between the transparent substrate and the hard coat layer.

Two or more conductive films (41, 42) are laminated on the transparent substrate (1). The conductive films (41, 42) are formed by forming transparent conductive layers (31, 32) on at least one surface of a polymer film (21, 22). As the transparent conductive layers (31, 32),
For example, a layer made of a metal, a layer made of a metal oxide, or the like can be given. Metals include gold, silver, platinum, palladium, copper, titanium, chromium, molybdenum, nickel, and zirconium. Metal oxides include silicon oxide, titanium oxide, tantalum oxide, tin oxide, indium oxide, zirconium oxide, and zinc oxide. And the like, each of which is used alone or in combination of two or more. Among them, silver is preferable in that a conductive film having excellent conductivity can be easily obtained.

The transparent conductive layer may be a single layer of a metal layer or a metal oxide layer, but when a metal layer (metal layer) is used, a dielectric layer is formed outside the layer. Layer (dielectric layer) is formed by laminating the transparent conductive layer to prevent reflection by the transparent conductive layer and increase the visible light transmittance even when the conductivity is improved by increasing the thickness of the transparent conductive layer. Is preferable because the Specific examples of such a multilayer structure include a three-layer structure represented by (dielectric layer / metal layer / dielectric layer) and (dielectric layer / metal layer / dielectric layer / metal layer / dielectric layer). A five-layer structure shown, a seven-layer structure represented by (dielectric layer / metal layer / dielectric layer / metal layer / dielectric layer / metal layer / dielectric layer), (dielectric layer / metal layer / dielectric layer) / Metal layer / dielectric layer / metal layer / dielectric layer / metal layer / dielectric layer), (dielectric layer / metal layer / dielectric layer / metal layer / dielectric layer / metal layer) / Dielectric layer / metal layer / dielectric layer / metal layer / dielectric layer).

The surface resistance of the transparent conductive layer is usually 50 Ω / □ or less, preferably 10 Ω / □ or less, and more preferably 6 Ω / □ or less in order to obtain a sufficient electromagnetic wave shielding function.

The transparent conductive layer can be provided on the surface of the polymer film by a method such as vapor deposition, sputtering, or ion plating.
0 nm, preferably about 50 to 500 nm. If the thickness is less than 30 nm, the conductivity tends to be insufficient, and if it exceeds 1000 nm, the transparency tends to decrease. In particular, when a silver layer is used, this tendency is remarkable.

The polymer films (21, 22) are not particularly limited as long as they have transparency.
In terms of ease of handling, processability, and economy, usually an ester resin film mainly composed of an ester resin such as polyethylene terephthalate, an acrylic resin mainly composed of an acrylic resin such as polymethyl methacrylate Film, cellulosic resin film containing cellulose resin such as triacetyl cellulose as a main component, film containing olefin resin such as polypropylene and polymethylpentene as a main component, polycarbonate resin film containing polycarbonate resin as a main component, polychlorinated resin A polyvinyl chloride resin film containing a vinyl resin as a main component is used. The thickness of the film is usually 20 to 500
It is about μm. Such a conductive film can be used, for example, by cutting out from a film having a transparent conductive layer formed continuously using a roll film as a raw material.

In the front plate for a plasma display of the present invention, it is necessary that two or more conductive films are laminated on a transparent substrate. Three or more conductive films may be laminated, but if two conductive films are laminated, sufficient electromagnetic wave shielding performance can be obtained, so that in terms of cost and complexity of the laminating process, usually two or more conductive films are laminated. A conductive film is laminated. Two or more conductive films may be laminated on at least one surface of the transparent substrate (FIGS. 2 to 6), or may be laminated on both surfaces of the transparent substrate (FIGS. 1, 7, and 8). .
In order to laminate the conductive film and the transparent substrate, the laminate may be performed using, for example, an adhesive. Examples of the adhesive include an acrylic adhesive and a rubber adhesive. Lamination, for example, after applying an adhesive on one side of the conductive film, the conductive film and a transparent substrate are overlaid, and then roll-bonded, using a sheet bonding machine or the like. Good. When laminating on a transparent substrate or the like with the transparent conductive layer on the outside, the adhesive may be applied to the surface of the conductive film opposite to the side on which the transparent conductive layer is formed.

When two or more conductive films are laminated on at least one surface of the transparent substrate, a transparent conductive layer (31) is formed on one surface of the polymer film (21) on the transparent substrate (1). The first conductive film (41) is laminated such that the transparent conductive layer is on the outside, and a first conductive film (32) having a transparent conductive layer (32) formed on one surface of a polymer film (22) is formed thereon. Second conductive film (4
2) may be laminated such that the transparent conductive layer is on the inside (FIG. 2),

A polymer film (2) is formed on a transparent substrate (1).
A first conductive film (41) having a transparent conductive layer (31) formed on one surface of 1) is laminated so that the transparent conductive layer is on the inner side, and a polymer film (22) is formed thereon. A second conductive film (42) having a transparent conductive layer (32) formed on one surface may be laminated with the transparent conductive layer inside (FIG. 3). In these cases (FIGS. 2 and 3)
The transparent conductive layers (31, 32) are joined to each other via an adhesive.

Further, a first conductive film (4) is formed on the transparent substrate (1).
1) is laminated such that the transparent conductive layer (31) is on the inside, and a second conductive film (42) is laminated thereon such that the transparent conductive layer (32) is on the outside. Well (FIG. 4), in which case the transparent conductive layer is on the outside,
This is preferable in that grounding can be easily performed.

Further, a first conductive film (41) is provided on the transparent substrate (1).
Are laminated with the transparent conductive layer (31) outside, and a second conductive film (42) is laminated on the transparent conductive layer with the transparent conductive layer (32) outside. 5) As the two conductive films (41, 42), a conductive film having an adhesive layer formed on a surface opposite to the side on which the transparent conductive layer is formed is preferable. In this case, the second conductive film (4
If the area of 2) is made smaller than the area of the first conductive film (41) (FIG. 6), the transparent conductive layer (31) of the first conductive film will be outside in the plane of the front plate. To the transparent conductive layer (32) of the first conductive film as well as the transparent conductive layer (32) of the second conductive film laminated on the first conductive film. ) Is preferable because the ground from) can be easily obtained. The exposed portion of the conductive layer (31) of the first conductive film may be provided only on one side of the front plate, or may be provided on two sides or three sides.
Although it may be provided on the side, it is preferable that it is exposed on the four sides, that is, the entire circumference of the front plate, in that the ground can be taken over the entire circumference. When two or more conductive films are laminated on one surface, a conductive film may be further laminated on the other surface.

When the conductive films (41, 42) are laminated on both sides of the transparent substrate (1), the transparent conductive layers (31, 32) of the conductive films (41, 42) on both sides are both inside. (FIG. 7)

It is preferable that one conductive film (41) is laminated so that the transparent conductive layer (31) is on the outside (FIG. 8).

More preferably, the transparent conductive layers (31, 32) of the conductive films (41, 42) on both sides are laminated so that both of them are on the outside (FIG. 1). By laminating in this manner, the ground from the transparent conductive layers (31, 32) can be easily taken.

The distance (d) between the transparent conductive layers formed on each conductive film is 0.5 mm or more in view of the performance of shielding electromagnetic waves generated from the plasma display.
Further, it is preferably at least 2 mm, particularly preferably at least 2.5 mm. For example, when the conductive films (41, 42) are laminated on both surfaces of the transparent substrate (1), the interval (d) is substantially equal to the thickness of the transparent substrate, the thickness of the polymer film, and the thickness of the conductive layer. (FIGS. 1, 7, and 8), usually 0.01 to 10 mm, preferably 0.5 to 10 mm
It is about. Further, the interval (d) is such that a first conductive film is laminated on one surface of the transparent substrate such that the transparent conductive layer is on the outside, and a second conductive film is further formed on the transparent conductive layer. When the film is laminated and laminated such that the transparent conductive layer is on the outside, the thickness and the thickness of the polymer film (22) constituting the second conductive film (42) to be further laminated are substantially increased. This is the sum of the thicknesses of the transparent conductive layers (32) (FIG. 5), and is usually about 20 to 500 μm. Therefore, in terms of electromagnetic wave shielding performance, the thickness is 0.5 m
It is preferable to laminate a conductive film on both surfaces of a transparent substrate having a thickness of at least m.

Thus, the front plate of the present invention can be obtained. In this front plate, even if other films such as an antireflection film, a near-infrared shielding film, and a surface protection film are laminated on the conductive film. Good.

The antireflection film is a film having an antireflection layer formed on the film. As the antireflection layer, for example, a layer made of a low refractive index material such as magnesium fluoride and silicon oxide, and a layer made of a low refractive material and a titanium oxide, tantalum oxide, tin oxide, indium oxide, zirconium oxide, zinc oxide, and the like Examples include a multilayer antireflection layer obtained by combining a layer made of a high refractive index substance. Specific examples of the antireflection layer include a two-layer structure represented by (air layer side) (silicon oxide layer / magnesium fluoride layer) (film side) in order from the air layer side. Further, an aluminum oxide layer may be provided between the film and the antireflection layer. When an aluminum oxide layer is provided on the antireflection layer, the layer structure shown in the order from the air layer side (air layer side) (silicon oxide layer / magnesium fluoride layer / aluminum oxide layer) (film side) Become. These antireflection layers have substantially no conductivity, and have a surface resistance value exceeding, for example, 50 Ω / □.

The film used for the antireflection film is not particularly limited as long as it has transparency. However, in terms of ease of handling, workability, and economy, an ester such as polyethylene terephthalate is usually used. Film based on acrylic resin, film based on acrylic resin such as polymethyl methacrylate, film based on cellulose resin such as triacetyl cellulose, olefin based resin such as polypropylene and polymethylpentene A film mainly composed of, a film mainly composed of a polycarbonate resin, a film mainly composed of a polyvinyl chloride resin and the like are used. The thickness of the film is usually about 20 to 500 μm. The hard coat treatment has been applied to the surface of the film,
It is preferable in terms of surface hardness. The hard coat treatment is performed in the same manner as described above.

Such an antireflection layer can be formed by, for example, a method such as vacuum deposition, sputtering, or ion plating, and its thickness is appropriately selected according to the degree of antireflection, and is usually about 100 to 500 nm.

The antireflection film may further have an antifouling layer formed on its surface. Such an antifouling layer can be easily formed, for example, by applying a solution of a fluorine-based or silicon-based coupling agent and then drying.

The antireflection film is laminated on the conductive film using, for example, an adhesive. Examples of the adhesive include an acrylic adhesive and a rubber adhesive. The lamination may be performed in the same manner as the lamination of the conductive film.

In order to protect the conductive film,
A film or the like subjected to a hard coat treatment may be laminated as a surface protective film. Such a surface protection film is laminated on a conductive film using, for example, an adhesive. Examples of the adhesive include an acrylic adhesive and a rubber adhesive. The lamination may be performed in the same manner as the lamination of the conductive film.

[0036]

The front plate of the present invention is excellent as a front plate for a plasma display because it can effectively shield electromagnetic waves generated from the screen of the plasma display and can be manufactured easily.

[0037]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

The evaluation method is as follows. (1) Light Transmittance The spectral transmittance of the obtained front plate in the range of 400 to 1000 nm was measured using an automatic recording spectrophotometer type 330 manufactured by Hitachi, Ltd. (2) Surface reflectivity 300 to 800 at an incident angle of 15 ° of the obtained front plate
The spectral reflectance in the range of nm was measured using a self-recording spectrophotometer MPS-2000 manufactured by Shimadzu Corporation. (3) Visibility The front plate obtained on the front of the 20-inch plasma display was attached and viewed through, and the difference between the color and the outline of the image before attachment was confirmed. (4) Electromagnetic wave shielding performance Using a shielding material evaluation system R2547 type (manufactured by Advantest Co., Ltd.), evaluation was made according to the following formula. Electromagnetic wave shielding property = 20 log ₁₀ (X ₀ / X) [dB] (where X ₀ is the electromagnetic wave intensity when the front plate is not used,
X indicates the electromagnetic wave intensity when the front panel is used. (5) Near-infrared ray shielding performance (remote control test) A plasma display device (PDS1000, manufactured by Fujitsu General Limited) equipped with a front panel is inclined to a home television. An image is displayed at a position 15 degrees forward and a distance of 10 m. A remote control signal (with a signal wavelength of 95
0 nm) to confirm that the remote control can be performed normally, and the plasma display device was brought closer to the home television. The distance between the plasma display device and the home television when the home television cannot be controlled normally is measured. If the near-infrared rays generated from the display device cannot be shielded, the remote control cannot be performed normally, and the device does not respond or malfunction. The shorter the distance at which remote control cannot be performed normally, the better the near-infrared shielding performance of the front panel. (6) High temperature durability test The obtained front plate was placed in an oven at 80 ° C,
After a lapse of time, the front panel was visually observed for changes in the appearance of the front panel.

Reference Example 1 (Manufacture of transparent substrate) Hard coat agent [acrylic] diluted with a mixed solvent of xylene, ethyl acetate and ethylene glycol monobutyl ether (mixing ratio 3: 1: 1) so that the solid content was 40%. System, manufactured by Koei Chemical Industry Co., Ltd., Koei Hard M101]
A transparent substrate [size 600 mm x 400 mm, thickness 4
mm, an acrylic resin plate (Sumipex E, manufactured by Sumitomo Chemical Co., Ltd.) was dipped, pulled up at a speed of 30 cm / min, and a hard coat agent was applied to both surfaces of the transparent substrate. After evaporating the solvent, a hard coat layer was provided on the transparent substrate by irradiating a 120 W metal halide lamp (UB0451, manufactured by Eye Graphic Co., Ltd.) from a distance of 20 cm for 10 seconds.

Reference Example 2 (Production of transparent substrate) Methyl methacrylate (45% by weight), isobornyl methacrylate (25% by weight), polyethylene glycol (average molecular weight: 200) dimethacrylate (30% by weight)
4 parts by weight of a phosphorus atom-containing compound represented by the chemical formula (1) CH ₂ = C (CH ₃ ) COO—CH ₂ CH (CH ₃ ) OP (O) (OH) ₂ (1) in 100 parts by weight of a mixture of Parts and a chemical formula (2) [CH ₂ = C (CH ₃ ) COO-CH ₂ CH (CH ₃ ) O] ₂ P (O) -OH (2) A phosphorus atom-containing compound (10 parts by weight) is added. And copper benzoate anhydride (5
Parts by weight) and t-butylperoxy-2-ethylhexanoate (0.5 parts by weight) as a radical polymerization initiator. This solution was poured into a polymerization cell consisting of a 3 mm-thick polyvinyl chloride gasket and two 620 mm × 420 mm × 10 mm glass plates.
Thereafter, the mixture was heated and polymerized at 100 ° C. for 2 hours, and a transparent substrate having a performance of shielding near-infrared rays [size 600 mm ×
400 mm, thickness 3 mm, plate shape]. 40 solids
% Mixed solvent of xylene, ethyl acetate and ethylene glycol monobutyl ether (mixing ratio 3: 1:
Urethane acrylate hard coat agent diluted in 1) [Koei Hard M101, manufactured by Koei Chemical Industry Co., Ltd.]
Then, the transparent substrate was immersed, pulled up at a speed of 30 cm / min, coated with a hard coat material on both sides, and evaporated to remove the solvent. Irradiation was performed for 10 seconds to provide hard coat layers on both surfaces of the transparent substrate.

REFERENCE EXAMPLE 3 (Production of antireflection film) A polyethylene terephthalate (hereinafter referred to as "PET") film [188 μm thick, manufactured by Toyobo] was subjected to DC magnetron sputtering to form an indium oxide-tin oxide (ITO) layer and silicon oxide. A layer, an ITO layer, and a silicon oxide layer were sequentially laminated to form an antireflection layer, thereby obtaining an antireflection film. Formula _{(3) C 3 F 7 -} (OCF 2 CF 2 CF 2) 24 -O (CF 2) 2 - [ _{[CH 2 CH-Si- (OCH 3} ) 3 ] _p] -H (3) (in the formula , P represents an integer of 1 to 10), and the fluorine-containing silane compound [number-average molecular weight: about 5,000, average value of p is 2.0] is diluted with tetradecafluorohexane to give the fluorine-containing silane compound. Was obtained at a concentration of 0.1% by weight. After laminating a mask film on the surface opposite to the surface on which the antireflection layer of the antireflection film obtained above was formed, the film was immersed in the solution obtained above,
It was pulled up at a speed of 15 cm / min and applied to both sides. After the application, the coating was allowed to stand at room temperature for 24 hours to evaporate the solvent to form an antifouling layer on the antireflection layer.

Example 1 A conductive film having a plurality of transparent conductive layers including a silver layer on both surfaces of the transparent substrate obtained in Reference Example 1 [Sou, USA]
manufactured by thwall Technologies, "AL
TAIR XIR ”, surface resistance 3.2 Ω / □, size 600 mm × 400 mm] (FIG. 1), and the anti-reflection film [size 600 mm ×
400 mm] on both sides to obtain a front plate. Lamination of the conductive film and the anti-reflection film was performed by pressure bonding with a roll using an adhesive. The front plate had a light yellowish light blue transmission color, very good appearance, and extremely few reflected images. When this front plate was mounted on the front surface of the plasma display, the visibility was good. In the remote control test, the distance between the plasma display device and the home television was 1.0.
m, the home television could be successfully remote-controlled. The evaluation results are shown in Tables 1 to 4.

Comparative Example 1 On one side of the transparent substrate obtained in Reference Example 2, a conductive film [manufactured by US Southwall Technologies, Inc.
"ALTAIR XIR", size 600mm x 400
mm], and the antireflection film obtained in Reference Example 3 was further laminated on both sides. An antireflection film was similarly laminated on the back surface to obtain a front plate. Lamination of the conductive film and the anti-reflection film was performed by pressure bonding with a roll using an adhesive. The front plate had a light yellowish light blue transmission color, had a good appearance, and had very few reflected images. When this front plate was mounted on the front surface of the plasma display, the visibility was good. In the remote control test, the home television could be normally remote-controlled until the distance between the plasma display device and the home television became 1.3 m. The evaluation results are shown in Tables 1 to 4.

Example 2 PET hard-coated in place of an antireflection film
Film [thickness 50 μm, manufactured by Toyobo Co., Ltd., size 6
00 mm × 400 mm], and a front plate was obtained in the same manner as in Example 1. This front plate was mounted on the front surface of the plasma display with the surface having the conductive layer facing the display screen. The front plate was light blue in transmission color and had a good appearance. In the remote control test, the distance between the plasma display device and the home television was 1.
Until it reached 0m, the home TV could be controlled remotely. The evaluation results are shown in Tables 1 to 4.

Example 3 Transparent substrate [Acrylic resin plate, manufactured by Sumitomo Chemical Co., Ltd., "SUMIPEX", thickness 3 mm, size 200 mm × 200
mm] on both sides of a conductive film [US Southwa
"ALTAIR" manufactured by II Technologies
XIR ", a size of 200 mm × 200 mm] was laminated such that the transparent conductive layer was on the outside (FIG. 1) to obtain a front plate. The lamination of the conductive film was performed by pressure bonding with a roll using an adhesive. Table 3 shows the evaluation results of this front panel.
Are shown in FIGS.

Example 4 Transparent substrate [Acrylic resin plate, manufactured by Sumitomo Chemical Co., Ltd., "SUMIPEX", thickness 3 mm, size 200 mm × 200
mm] on one surface of a first conductive film [US Sout
halt Technologies, "ALT
AIR XIR ", having a size of 200 mm x 200 mm], with the conductive layer on the outside, and further a second conductive film [US Southwall]
"ALTAIR XI" manufactured by Technologies
R ", size 190 mm × 190 mm] were laminated such that the conductive layer was on the outside (FIG. 6) to obtain a front plate. Since the first conductive film has a larger area than the second conductive film, a part of the transparent conductive layer of the first conductive film is exposed to the outside. In this embodiment, the second conductive film was laminated so as to have a width of 5 mm over the entire circumference of the front plate and expose the transparent conductive layer to the outside of the front plate. The lamination of the conductive film was performed by pressure bonding with a roll using an adhesive. Tables 3 and 4 show the evaluation results of this front panel.

[0047]

[Table 1]

[0048]

[Table 2]

[0049]

[Table 3] ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Wavelength shielding performance Example 1 Comparative Example 1 Example 2 Example 3 Example 4 ＭＨｚ 30 MHz 63 dB 55 dB 62 dB 61 dB 57 dB 50MHz 57dB 49dB 55dB 56dB 53dB 70MHz 53dB 45dB 52dB 52dB 50dB 90MHz 51dB 42dB 51dB 50dB 48dB ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ━━━━

[0050]

[Table 4] ━━━━━━━━━━━ Example Change in appearance ─────────── Example 1 No change Comparative Example 1 No change Example 2 No change Example 3 No change Execute Example 4 No change ━━━━━━━━━━━

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a front panel for a plasma display of the present invention.

FIG. 2 is a schematic sectional view showing an example of a front panel for a plasma display of the present invention.

FIG. 3 is a schematic sectional view showing an example of a front panel for a plasma display of the present invention.

FIG. 4 is a schematic sectional view showing an example of a front panel for a plasma display of the present invention.

FIG. 5 is a schematic sectional view showing an example of a front panel for a plasma display of the present invention.

FIG. 6 is a schematic sectional view showing an example of a front panel for a plasma display of the present invention.

FIG. 7 is a schematic sectional view showing an example of a front panel for a plasma display of the present invention.

FIG. 8 is a schematic sectional view showing an example of a front panel for a plasma display of the present invention.

[Explanation of symbols]

 1: transparent substrate 21, 22: polymer film 31, 32: transparent conductive layer 41, 42: conductive film d: interval between transparent conductive layers

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G09F 9/00 318 H01J 17/16 H01J 11/02 H04N 5/66 101Z 17/16 G02B 5/22 H04N 5/66 101 1 / 10 Z // G02B 5/22 A

Claims (10)

[Claims] 1. A front plate for a plasma display comprising a transparent substrate and two or more conductive films each having a transparent conductive layer formed on at least one surface of a polymer film. 2. The front plate for a plasma display according to claim 1, wherein two or more conductive films are laminated on at least one surface of the transparent substrate. 3. A first conductive film having a transparent conductive layer formed on at least one surface of a transparent substrate and having a transparent conductive layer formed on one surface of a polymer film, wherein the first conductive film is laminated with the transparent conductive layer facing outside. 3. The front plate for a plasma display according to claim 2, wherein a second conductive film having a transparent conductive layer formed on one surface of a polymer film is laminated thereon, with the transparent conductive layer facing outward. 4. The area of the second conductive film is smaller than the area of the first conductive film, and the transparent conductive layer of the first conductive film is exposed outside in the plane. The front plate for a plasma display according to 1. 5. The front plate for a plasma display according to claim 1, wherein a conductive film is laminated on both surfaces of the transparent substrate. 6. The plasma display according to claim 5, wherein a conductive film having a transparent conductive layer formed on one surface of a polymer film is laminated on both surfaces of a transparent substrate with the transparent conductive layer facing outward. Front plate. 7. The distance between the transparent conductive layer of the conductive film laminated on one surface of the transparent substrate and the transparent conductive layer of the conductive film laminated on the other surface is 0.5 mm or more. A front panel for a plasma display according to claim 6. 8. The front plate for a plasma display according to claim 1, wherein at least the surface of the transparent substrate on which the conductive film is laminated is subjected to a hard coat treatment. 9. A plasma display, wherein the front panel for a plasma display according to claim 1 is arranged on a front surface. 10. A method for shielding electromagnetic waves generated from a plasma display, comprising mounting the front panel for a plasma display according to claim 1 on a front surface of the plasma display.