JPH11282363A - Filter for plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent light from a plasma display panel transmitted in the vicinity of a peripheral part of a near infra-red ray absorbing layer from causing irregular color so as to provide a clear color image as a whole, by preventing corrosion of the near infra-red ray absorbing layer caused by a solvent contained in a conductive adhesive when the conductive adhesive is arranged in a periphery of the near infra-red ray absorbing layer in a surface of an electromagnetic wave shielding layer. SOLUTION: An electromagnetic wave shielding layer 12 is formed in one face of a resin film 11 for a base material, a near infra-red ray absorbing layer 13 is formed on a surface excluding a peripheral area in the electromagnetic wave shielding layer 12, a conductive adhesive layer 14 is formed to have a spaced part 15 between itself and the near infrared ray absorbing layer 13 within a near infra-red ray absorbing layer nonforming area in a surface peripheral area of the electromagnetic wave shielding layer 12, and plural remaining solvent removing holes 16 are formed in a laminate including the supporting film 11 along the spaced part 15 to communicate the spaced part 15 with the atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for a plasma display panel, and more particularly, to a filter used by being attached to, for example, a front surface of a plasma display panel.

[0002]

2. Description of the Related Art Light and thin, high brightness,
Moreover, a plasma display panel (hereinafter, referred to as a PDP) capable of obtaining a large screen is already well known. Briefly describing the structure of this PDP,
In this type of PDP, a large number of cells are formed in a space between a front glass substrate and a rear glass substrate (hereinafter, referred to as a tube) arranged at an interval, and xenon gas is sealed in the tube to form a front glass substrate. A surface discharge is generated on the surfaces of the dielectric layer and the protective layer formed on the inner surface of the substrate to excite xenon gas molecules, and ultraviolet rays are generated to cause the phosphor in the cell to emit light.

[0003] This kind of P in which xenon gas is sealed in a tube
In the DP, near-infrared rays and electromagnetic waves are generated together with ultraviolet rays generated to emit light from the phosphor, and a part thereof is emitted outside the tube. Therefore, a filter having near-infrared ray cut (absorption) performance, electromagnetic wave shielding performance, anti-scratch performance, anti-reflection performance, and the like is attached to the front surface of a conventional PDP.

A PDP filter having such a near-infrared absorbing layer and an electromagnetic wave shielding layer is generally constructed as follows. That is, a silver vapor-deposited film is formed as an electromagnetic wave shielding layer on a polyethylene film as a base material, and a near-infrared absorbing layer is formed by coating a near-infrared absorbing agent on the silver vapor-deposited film. A conductive paint (adhesive) is applied around the near-infrared absorbing layer on the surface of the electromagnetic wave shield layer made of the silver vapor-deposited film to form a conductive adhesive layer. The film configured in this way is usually called a functional film.

[0005] This functional film is attached to the surface of a polycarbonate resin plate as a substrate. A conductive tape is provided on the entire periphery of the substrate in advance so as to cover the frame shape, that is, the outer peripheral portion of the substrate in a U-shaped cross section from the front surface side to the rear surface side via the side surface. ing. Therefore, when the functional film is attached to the substrate, the conductive paint overlaps and adheres to the conductive tape provided around the substrate, and as a result, the conductive tape is in an electrically conductive state with the electromagnetic wave shielding layer via the conductive paint. Becomes

If necessary, an antireflection layer is formed on both sides of the substrate with the functional film, and a copper foil tape serving as an electrode is attached to the outer periphery. An electrical connection is established, whereby a PDP filter is finally formed (completed).

This PDP filter is attached to the front of the PDP by a frame provided around the front of the PDP. At this time, the copper foil tape of the PDP filter comes into contact with the external ground terminal configured on this frame,
As a result, the electromagnetic wave shielding layer is grounded and performs its function.

[0008]

However, when a conductive paint (adhesive) is applied around the near-infrared absorbing layer formed on the electromagnetic wave shielding layer on the surface of the polyethylene film as the base material, the conductive paint is applied. The solvent contained in the near-infrared absorbing layer erodes the adjacent, and the light from the plasma display panel that passes through the portion becomes color unevenness,
There was a problem.

An object of the present invention is to solve such a conventional problem. When the conductive adhesive is disposed around the near-infrared absorbing layer on the surface of the electromagnetic wave shielding layer, the conductive adhesive is used. Prevents the erosion of the near-infrared absorbing layer by the solvent contained in the near-infrared absorbing layer, thereby preventing the light from the plasma display panel passing around the periphery of the near-infrared absorbing layer from appearing as color unevenness, and overall An object of the present invention is to provide a filter for a plasma display panel capable of obtaining a clear color image.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a filter for a plasma display panel, and has the following structure to solve the above-mentioned technical problems. That is, the present invention relates to a filter attached to the front surface of a plasma display panel, wherein a resin film serving as a base material, an electromagnetic wave shielding layer formed on one surface of the resin film, and a surrounding area in the electromagnetic wave shielding layer A near-infrared absorbing layer formed on the surface excluding the above, and a conductive portion formed by providing a space between the near-infrared absorbing layer and the near-infrared absorbing layer non-forming region in a region around the surface of the electromagnetic wave shielding layer. A conductive adhesive layer, and a plurality of residual solvent drain holes in the laminate including the support film along the space to communicate the space between the conductive adhesive layer and the near-infrared absorbing layer to the atmosphere. Is formed.

<Additional Configuration in the Present Invention> The filter for a plasma display panel of the present invention includes the above-mentioned essential components, but is established even when the following configuration is further added to the components. I do. The additional component is that the near-infrared absorbing layer and a conductive adhesive layer formed around the near-infrared absorbing layer are bonded to a substrate, and the conductive adhesive layer is formed in a peripheral region of the substrate surface where the conductive adhesive layer is located. An external ground terminal, at least a conductive material that electrically connects the conductive adhesive layer to the external ground terminal, and the electromagnetic wave shielding layer is connected to the external ground terminal through the conductive adhesive layer and the conductive material. It is characterized by having a structure electrically connected to the terminal.

<Specific Configuration in the Present Invention> The filter for a plasma display panel of the present invention is composed of the above-mentioned essential components, but is established even when the components are specifically as follows. The specific component is characterized in that the conductive material is provided at least to the side surface of the substrate.

[0013] In the filter for a plasma display panel of the present invention, the near-infrared absorbing layer and the conductive adhesive layer existing therearound are arranged on the electromagnetic wave shielding layer formed on the surface of the supporting film. Electrodes are provided on the surfaces of the near-infrared absorbing layer and the conductive adhesive layer so as to surround a peripheral edge of a filter body in which substrates provided with a conductive material on the outer periphery are sequentially laminated. Are electrically conductive by lamination with the conductive material,
The electrode is characterized in that it is electrically connected to an external ground terminal.

Further, in the plasma display panel filter of the present invention, it is preferable that the electromagnetic wave shielding layer is formed of a silver vapor-deposited film formed on the inner surface of the resin film by vapor deposition. It can also be characterized by being composed of a tape.

According to the filter for a plasma display panel of the present invention, the near-infrared absorbing layer and the near-infrared absorbing layer in the area around the surface are formed on the surface of the electromagnetic wave shielding layer formed on one surface of the resin film as the base material. A formation region is provided, and then a conductive adhesive layer is provided in the region where the near-infrared absorbing layer is not formed, at a distance from the near-infrared absorbing layer. Then, a plurality of residual solvent drain holes are formed along the space in the laminated body composed of the support film and the electromagnetic wave shielding layer formed on the surface of the support so as to communicate the space, that is, the space with the atmosphere.

The solvent contained in the conductive adhesive diverges from these residual solvent drain holes while the conductive adhesive cures, preventing erosion of the adjacent near-infrared absorbing layer. As a result, light from the plasma display panel that passes through the vicinity of the outer periphery of the near-infrared absorbing layer does not appear as color unevenness, and a clear color image can be obtained as a whole.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a filter for a plasma display panel (hereinafter, simply referred to as a PDP filter) of the present invention will be described in more detail. The PDP filter according to one embodiment of the present invention includes:
It is used by being attached to the front of a plasma display panel, that is, a PDP. FIG. 1 shows a partial cross-sectional structure near the periphery of a PDP filter 10 according to an embodiment of the present invention, and FIG. 2 shows a partial cross-sectional structure near a central portion.

The PDP filter 10 basically includes a resin support film 11 serving as a base material, and an electromagnetic wave shielding layer 12 formed on one surface of the support film 11. On the surface of the electromagnetic wave shielding layer 12,
Except for the surrounding area, the near infrared absorbing layer 13 and the adhesive layer 17 are formed thereon. Then, a conductive adhesive layer 14 is provided on the surface of the electromagnetic wave shield layer 12 where the near-infrared absorbing layer is not formed, that is, in the area where the near-infrared absorbing layer is not formed.
3 is applied with a space from the outer peripheral portion. Therefore, the space 15 becomes a groove surrounding the near-infrared absorbing layer 13 as shown in FIG.

On the surface of the electromagnetic wave shielding layer 12, a space between the near-infrared absorbing layer 13 and the conductive adhesive layer 14, that is, the groove 15 is laminated on the support film 11 and the surface so as to communicate with the atmosphere. A plurality of residual solvent drain holes 16 are provided along the groove 15 in the laminated body including the electromagnetic wave shielding layer 12. Thereby, the conductive adhesive layer 14
After the conductive adhesive is applied to form the liquid, the solvent contained in the adhesive is escaping and escaping from the groove 15 and these residual solvent drain holes 16 and escapes until the conductive adhesive is cured,
Thus, erosion of the adjacent near-infrared absorbing layer 13 is prevented.

The film thus configured is the functional film F. On the other hand, for example, a conductive tape 19 as a conductive material is provided around a substrate 18 made of a transparent resin such as polycarbonate or the like in a frame shape, that is, the outer peripheral portion of the substrate 18 is cross-sectionally extended from the front side to the rear side via the side surface. It is provided so as to cover the entire circumference.

On the surface of the substrate 18, the above-mentioned functional film F is bonded so that the adhesive layer 17 and the conductive adhesive layer 14 are overlapped on the surface of the substrate 18. Thereby, the functional film F is adhered to the substrate 18 by the adhesive layer 17 and the conductive adhesive layer 14 provided on the surface of the near-infrared absorbing layer 13, and at this time, the conductive adhesive layer 14
Corresponding to the conductive tape 19 located around the surface of the substrate 18, the conductive tape 19 overlaps and is adhered to the conductive tape 19.

In other words, the width dimension (the depth of the region toward the center of the support film) of the region where the near-infrared absorbing layer is not formed, which is provided around the electromagnetic wave shielding layer 12 for forming the conductive adhesive layer 14, Since the conductive film 19 is designed in advance so that the width of the conductive tape 19 on the surface of the substrate 18 is substantially the same, when the functional film F is bonded to the substrate 18 as described above, the conductive adhesive layer 14 becomes The conductive tape 19 located on the surface of the substrate 18 is superimposed substantially coincident therewith.

The thus-formed substrate with a functional film, that is, the filter body, has a protective tape 20 (see FIG. 3 (e)) attached around it in a frame shape. At this time, a part of the protection tape 20 stuck on the peripheral surface of the support film 11
1 to a position that closes the residual solvent draining hole 16 communicating with the groove 15.

Thereafter, the filter body is subjected to a dipping process for preventing reflection, and
An anti-reflection layer 21 is formed on the outer surface of each of the substrate 1 and the substrate 19. Thereafter, the protection tape 20 is removed, and an electrode 22 made of a copper foil tape is attached to the periphery of the filter body in a frame shape, and a part of the electrode 22 overlaps the conductive tape 19 to be in an electrically conductive state. This electrode 2
In mounting 2, the end portion of the copper foil tape located on the outer periphery of the surface of the support film 11 as shown in FIG.

Such a PDP filter 10 is mounted on a mounting structure provided on the front surface of a plasma display panel (not shown). At that time, the electrode 22 contacts the external ground terminal provided on the mounting structure,
The electromagnetic wave shielding layer 12 of the PDP filter 10 is electrically connected to an external ground terminal via the conductive adhesive layer 14 and the conductive tape 19, and the electromagnetic wave shielding layer 12 exerts its function.

Next, a method of manufacturing the PDP filter 10 will be described with reference to FIGS. 3 (a) to 3 (h). Fig. 3 (a)
As shown in (1), the long support film 11 on which the electromagnetic wave shielding layer 12 is already formed on one surface is wound and set on the supply roll 31 of the near-infrared absorbing agent coating device 30. When the support film 11 sent from the supply roll 31 passes through the near-infrared absorbing agent coating device 30, the surface of the electromagnetic wave shielding layer 12 is partially coated with the near-infrared absorbing agent continuously, and the winding roll 32 It is wound up.

The partial coating of the near-infrared absorbing agent on the surface of the electromagnetic wave shielding layer 12 means that, as shown in FIG. Coating at the same time with a predetermined interval in the feeding direction of the support film. In this manner, the long support film 11 in which the near-infrared absorbing layer 13 is partially formed on the surface of the electromagnetic wave shielding layer 12 and wound on the winding roll 32 is shown in FIG. Is set as the supply roll 34 of the adhesive coating device 33 as described above.

When the support film 11 sent out from the supply roll 34 passes through the adhesive coating device 33, the entire surface of each near-infrared absorbing layer 13 is coated with an adhesive, thereby forming a functional film F. It is taken up by a take-up roll 35. The functional film F wound on the winding roll 35 is then placed on a surface of the support film 11 at a predetermined distance in the longitudinal direction of the laminated film formed of a near-infrared absorbing layer or the like. The film is sequentially cut at the center of the mutual interval and divided into individual functional films F.

Then, as shown in FIG. 3 (c), for each functional film F, a conductive paint (adhesive material) is applied on the surface of the electromagnetic wave shielding layer 12 in the margin around the laminated body composed of the near infrared absorbing layer and the like. ) Is applied at an interval from the outer peripheral edge of the laminated portion including the near-infrared absorbing layer 13 and the pressure-sensitive adhesive layer 17 coated thereon to form the conductive adhesive layer 14.

FIG. 3 (c) shows that the space is formed by the near-infrared absorbing layer 13 and the adhesive layer 17 coated thereon.
The groove 15 is formed so as to form a boundary between the laminated portion made of and the conductive adhesive layer 14. Immediately after the formation of the conductive adhesive layer 14, the support film 1
A plurality of residual solvent draining holes 16 communicating with a groove 15 which is a boundary thereof are formed at predetermined intervals and along the groove 15 in a laminated body composed of the electromagnetic wave shield layer 12 formed on the surface of the electromagnetic wave shielding layer 1. .

The functional film F thus formed is adhered to the surface of a polycarbonate resin plate as the substrate 18 as shown in FIG. 3 (d), and a substrate with a functional film, that is, a filter body is formed. You. At this time, the conductive tape 19 covers the entire periphery of the substrate 18 in advance in a frame shape, that is, the outer peripheral edge portion of the substrate 18 is covered in a U-shape in cross section from the front surface side to the rear surface side via the side surface. It is provided to span.

Accordingly, when the functional film F is bonded to the substrate 18, the conductive adhesive layer 14 overlaps and adheres to the conductive tape 19 provided around the substrate 18, and as a result, the conductive tape 19 becomes conductive. It becomes electrically conductive with the electromagnetic wave shielding layer 12 via the adhesive layer 14.

Next, as shown in FIGS. 3 (e) and 3 (f), the protective tape 20 is attached to the entire periphery of the filter body in a frame shape, and then the anti-reflection layer 21 is formed. (FIG. 3 (g)).
At this time, since the protection tape 20 reaches the position where the residual solvent draining hole 16 opened on the surface of the support film 11 is closed, the anti-reflection agent enters inside through the residual solvent draining hole 16 during the dipping process. There is no danger.

Then, after removing the protect tape 20, as shown in FIG.
Is attached so as to cover the residual solvent drain hole 16 opened on the surface of the support film 11, and partially overlaps the above-described conductive tape 19 to establish mutual electrical continuity. Thus, the PDP filter 10 is configured (completed). The reason for closing the residual solvent drain hole 16 after the curing of the conductive adhesive layer is completed is to prevent the deterioration of the near-infrared absorbing agent, silver and the like from being promoted by oxygen.

The method of manufacturing the PDP filter 10 is merely an example, and the present invention is not limited to the method manufactured by such a process. For example, in the method of manufacturing the PDP filter 10 described above, a conductive paint (adhesive) is applied to a margin around the laminated portion including the near-infrared absorbing layer on the electromagnetic wave shielding layer 12 on the surface of the support film 11. The conductive adhesive layer 14 is formed by applying the conductive tape 19 on the entire surface of the substrate 18 to which the conductive adhesive layer 14 is attached as described above, and then the conductive adhesive 19 is applied to the surface of the conductive tape 19 located on the surface. The conductive adhesive layer 14 may be formed in advance.

Here, the material constituting each layer will be briefly described. The transparent resin film serving as the support film 11 may be any resin film which is substantially transparent and does not have large absorption and scattering. Absent. Specific examples of the resin used for the transparent resin film include polyolefin resin, polyester resin, polycarbonate resin, poly (meth) acrylate resin, polystyrene, polyvinyl chloride, polyvinyl acetate, and polyarylate. Resins, polyethersulfone resins and the like.

Among these, amorphous polyolefin resin, polyester resin, polycarbonate resin, poly (meth) acrylate resin, polyarylate resin, and polyether sulfone resin are particularly preferable. Among resins, cyclic polyolefin is particularly preferable, and among polyester resins, polyethylene terephthalate is particularly preferable.

The above resins are generally known additives such as phenolic and phosphorus-based antioxidants, halogen-based and phosphoric acid-based flame retardants, heat-resistant anti-aging agents, lubricants, antistatic agents and the like. Can be blended. The transparent resin film is formed by a known method such as T-die molding, calender molding, or compression molding, or a method of dissolving in an organic solvent and casting.

As the thickness of the film, depending on the purpose,
A range of 10 μm to 1 mm is desirable. The transparent resin film may be unstretched or stretched. Further, it may be laminated with another plastic substrate. Further, the transparent resin film is subjected to a surface treatment by a conventionally known method such as a corona discharge treatment, a flame treatment, a plasma treatment, a glow discharge treatment, a surface roughening treatment, a chemical treatment, or a coating such as a primer on one or both surfaces. Is also good.

Next, as the electromagnetic wave shielding layer 12, a mesh of a conductive fiber, vapor deposition of a conductive substance, or a combination thereof is used, and vapor deposition of a conductive substance is preferable from the viewpoint of visibility. The conductive material deposited on the surface of the support film 11 is deposited for the purpose of shielding electromagnetic waves emitted from the PDP, and a metal or a metal oxide is used, but a visible light region of 400 to 700 nm is used. Any material may be used as long as it transmits 70% or more and has a surface specific resistance of 50Ω / port or less.

Preferably, a metal oxide such as tin oxide, indium tin oxide (hereinafter, referred to as ITO), antimony tin oxide (hereinafter, referred to as ATO), or a metal oxide and a metal are alternately laminated. Lamination of a metal oxide and a metal is more preferable because the surface resistivity can be reduced. Metal oxides include tin oxide, ITO and ATO,
Silver or silver-palladium alloy is generally used as the metal, and usually about 3 to 11 layers are stacked starting from a metal oxide layer.

Further, as a conductive material forming the electromagnetic wave shielding layer 12, aluminum zinc oxide (hereinafter, referred to as aluminum zinc oxide)
It is also preferable to form the film by sputtering AZO). Since this AZO has not only the performance of shielding electromagnetic waves, but also the performance of absorbing ultraviolet rays, particularly ultraviolet rays having a wavelength of 350 nm or less, if the electromagnetic wave shielding layer 12 is made of this AZO, it can also serve as an ultraviolet shielding layer. Can be.

The thickness of the conductive material varies depending on required physical properties, applications, etc.
Preferably, it is 50 to 300 nm. It is desirable that the thickness of each part of the film is uniform. Alternatively, the conductive material may be directly deposited on the transparent resin film. In that case, in order to improve mutual adhesion, it is desirable to coat the base surface of the transparent resin film beforehand with a base coat agent.

Next, the near-infrared absorbing layer 13 provided on the surface of the electromagnetic wave shielding layer 12 is obtained by, for example, coating a near-infrared absorbing agent coating solution. The near-infrared absorbing agent coating liquid is obtained by dispersing or dissolving a near-infrared absorbing agent in an organic solvent and adding a binder resin, or a near-infrared absorbing agent, for example, a monofunctional or polyfunctional acrylate such as polyurethane acrylate or epoxy acrylate. And a hard coat agent containing a photopolymerization initiator and an organic solvent, such as an isocyanate-based, polyurethane-based, polyester-based, polyethyleneimine-based, polybutadiene-based or alkyl titanate-based anchor coat agent or adhesive, and the like. Then, the coating liquid is coated on the electromagnetic wave shielding layer 12.

Examples of the near-infrared absorbing agent to be used include nitroso compounds which are organic substances and metal complex salts thereof, cyanine compounds, squarylium compounds, thiol nickel complex salt compounds, phthalocyanine compounds, naphthalocyanine compounds, triallylmethane compounds. Compound, immonium-based compound, diimonium-based compound, naphthoquinone-based compound, anthraquinone-based compound or amino compound, aminium salt-based compound, or inorganic carbon black, indium tin oxide, antimony tin oxide, periodic table 4A, 5A or 6A An oxide, a carbide, or a boride of a metal belonging to the group may be used. At least two of these are used.

Further, it is preferable to use at least one kind of near-infrared absorbing agent selected from an immonium compound, a diimonium compound and an aminium salt compound. More preferably, at least one selected from the above-mentioned near-infrared absorbing agents other than the immonium-based compound, the diimonium-based compound and the aminium salt-based compound is used in combination.

The substrate 18 is not particularly limited as long as it is a resin substrate which is substantially transparent and does not have large absorption and scattering. Specific examples of resins used include polyolefin resins, polyester resins, polycarbonate resins, poly (meth) acrylate resins, polystyrene, polyvinyl chloride, polyvinyl acetate, polyacrylate resins, polyethersulfone. Resins and the like can be given.

Of these, amorphous polyolefin resin, polyester resin, polycarbonate resin, poly (meth) acrylate resin, polyarylate resin, and polyether sulfone resin are particularly preferable. In the resin for the transparent resin substrate, generally known additives,
For example, a phenol-based or phosphorus-based antioxidant, a halogen-based or phosphoric acid-based flame retardant, a heat-resistant anti-aging agent, a lubricant, an antistatic agent, and the like can be added.

The transparent resin substrate 18 is made by a known injection molding, T
It is formed into a sheet (plate) using a method such as die forming, calendering, or compression molding. The thickness of the sheet is preferably in the range of 1 mm to 8 mm depending on the purpose. Such a transparent substrate 18 may be laminated with another plastic substrate. It is also preferable to form an anti-scratch layer 23 on one surface of the transparent resin substrate to prevent damage as shown in FIG.

The anti-scratch layer, that is, the hard coat layer 23
Is formed from, for example, a monofunctional or polyfunctional acrylate such as urethane acrylate or epoxy acrylate, a photopolymerization initiator, and a hard coat agent mainly containing an organic solvent. In order to improve abrasion resistance, a silica sol using a colloidal metal oxide and an organic solvent as a dispersion medium can be added.

The provision of the anti-reflection layer 21 on the PDP filter 10 means that when the PDP filter 10 is provided on the front surface of the PDP, the anti-reflection layer 21 on the PDP side increases the transmittance of light from the PDP. The anti-reflection layer 21 on the opposite side (closer to the human eye) has the effect of preventing reflection of external light such as fluorescent light, and has the effect of improving the visibility of an image.

The antireflection layer 21 has a relatively low refractive index, such as silicon oxide, zirconium oxide, titanium oxide, magnesium fluoride, calcium fluoride, aluminum oxide, or as disclosed in JP-A-2-19801. It is composed of a non-crystalline fluorine-containing polymer. As a forming method, a method of applying and firing a metal alkoxide, a vacuum evaporation method, a sputtering method, an ion plating method,
A CVD method, a roll coating method, a dip coating method, and the like can be given. From the viewpoint of economy and handling, it is preferable to coat a solution obtained by dissolving the amorphous fluoropolymer in a fluorinated solvent by dip coating. The coating has a thickness of 10 to 1000 nm, preferably 20 to 5 nm.
00 nm.

The filter for PDP of the present invention is 400 to
The transmittance of visible light at 700 nm is 50% or more, preferably 65% or more, and the transmittance of near infrared light at 850 to 1000 nm is 15% or less, preferably 10% or less, and 3% or less.
It has an electromagnetic shielding performance of 0 dB to 100 MHz of 30 dB or more, and is suitable as a filter for PDP.

The above-described layer configuration of the PDP filter 10 is merely an example, and the present invention is not limited to such a layer configuration. For example, an ultraviolet shielding layer may be added, or an ultraviolet absorber may be kneaded and mixed with the resin forming the support film 11 or the resin forming the substrate 18, or may be added to the above-described base coat agent or the like. Good.

[0055]

As described above, according to the filter for a plasma display panel of the present invention, the near infrared absorbing layer partially formed on the surface of the electromagnetic wave shielding layer formed on one surface of the resin film. When providing a conductive adhesive layer around the periphery, since the residual solvent drain hole communicating with the space between the conductive adhesive layer and the near-infrared absorbing layer was formed in the laminate including the support film, the conductive The erosion of the near-infrared absorbing layer by the solvent contained in the adhesive can be prevented.

As a result, it is possible to prevent the light from the plasma display panel, which passes through the adjacent portion between the conductive adhesive and the near-infrared absorbing agent, from appearing as color unevenness, and to obtain a clear color image as a whole. It is possible to provide a filter for a plasma display panel that can be used.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a layer structure at an end of a PDP filter according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1 to show a layer structure in a central portion of the PDP filter according to one embodiment of the present invention.

FIG. 3 is a PD according to an embodiment of the present invention shown in FIG.
It is process explanatory drawing which shows the process of manufacturing a filter for P schematically.

4 is a fragmentary perspective view showing a state in which a near-infrared absorbing layer is partially formed on the surface of the electromagnetic seal layer of the support film on which the electromagnetic wave shield layer is formed in the PDP filter manufacturing process shown in FIG. 3; .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Plasma display panel filter 11 Support film 12 Electromagnetic wave shielding layer 13 Near-infrared absorbing layer 14 Conductive adhesive (paint) layer 15 Groove (space) 16 Residual solvent drain hole 17 Adhesive layer 18 Substrate 19 Conductive tape 20 Protect tape 21 Anti-reflection layer 22 Electrode 23 Hard coat layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01J 11/02 H01J 11/02 Z H04N 5/66 101 H04N 5/66 101Z // H05K 9/00 H05K 9/00 V

Claims (6)

[Claims] 1. A filter attached to a front surface of a plasma display panel, comprising: a resin film serving as a base material; an electromagnetic wave shielding layer formed on one surface of the resin film; and a surrounding area in the electromagnetic wave shielding layer. The near-infrared absorbing layer formed on the removed surface, and a conductive portion formed by providing a space between the near-infrared absorbing layer in the near-infrared absorbing layer non-forming region in the area around the surface of the electromagnetic wave shielding layer Along with the conductive adhesive layer and the near-infrared absorbing layer, the laminate including the support film is provided along the space so as to communicate with the atmosphere. A filter for a plasma display panel, wherein a hole is formed. 2. The plasma display panel filter according to claim 1, wherein a surface of the near-infrared absorbing layer and a surface of the conductive adhesive layer formed around the near-infrared absorbing layer are bonded to a substrate, and the conductive adhesive layer is positioned on the substrate. The electromagnetic wave shield, comprising at least a conductive material disposed between the substrate and the conductive adhesive layer in a peripheral region of the substrate surface to electrically connect the conductive adhesive layer to an external ground terminal. The filter for a plasma display panel according to claim 1, wherein a layer is configured to be electrically connected to the external ground terminal via the conductive adhesive layer and the conductive material. 3. The substrate according to claim 2, wherein the conductive material is provided at least to a side surface of the substrate.
3. The filter for a plasma display panel according to 1.). 4. The near-infrared absorbing layer and the conductive adhesive layer surrounding the near-infrared absorbing layer are disposed on the electromagnetic wave shielding layer formed on the surface of the support film, and the near-infrared absorbing layer and the conductive adhesive On the surface of the agent layer, an electrode is provided so as to surround a peripheral edge of a filter body in which substrates provided with a conductive material on the outer periphery are sequentially laminated.
The plasma according to claim 2, wherein the electrode is electrically connected to the conductive material by being laminated, and the electrode is electrically connected to the external ground terminal. 5. Filter for display panel. 5. The filter according to claim 2, wherein the electromagnetic wave shielding layer is a silver vapor-deposited film deposited on an inner surface of the resin film. 6. The filter for a plasma display panel according to claim 2, wherein the conductive material and the electrode are made of a metal foil tape.