JP2010204332A - Filter for display and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter for display which enables a considerable cost reduction with respect to productivity and raw materials and has a stable electrode, and to provide a manufacturing method thereof. <P>SOLUTION: The filter for display is characterized in that it is mounted in an image display panel for display and has at least a base member, a conductive layer, and a functional surface layer in this order and has a space which reaches the conductive layer from the functional surface layer and has a width of <2 mm, in at least a part of a region corresponding to a non-image display region of the image display panel, and one of conductive members of (A), (B) and (C) is stuck to the space through the conductive adhesive layer of the conductive member. A conductive member (A) having a conductive adhesive layer laminated on cloth made of conductive fibers, a conductive member (B) having a conductive adhesive layer laminated on a conductive plastic film having metal plated on both surfaces of a plastic film having a plurality of through-holes, or a conductive member (C) having a conductive adhesive layer laminated on a release film. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display filter for mounting on a display image display panel and a method for manufacturing the same.

  A display such as an organic EL display, a liquid crystal display, or a plasma display is a display device capable of clear full color display. The display is usually provided with a front filter (display filter) on the viewing side of the display for the purpose of preventing reflection of external light, shielding electromagnetic waves generated from the display, and protecting the display.

  In particular, because plasma displays generate strong electromagnetic waves due to their structure and operating principle, they have been given anti-reflection and anti-glare functions to shield electromagnetic waves and prevent reflection and glare from outside light. Display filters are usually used. The antireflection function and the antiglare function are usually arranged so as to be the outermost surface on the viewing side (viewing side). Hereinafter, a layer having an antireflection function or an antiglare function is referred to as a functional surface layer.

  An image display panel to which a display filter is attached is usually incorporated into a plasma display device as follows. That is, a panel module is formed by holding the image display panel on the front surface of a metal chassis member on which the drive circuit block is disposed, and a housing made of a front cover and a back cover is provided so as to accommodate the panel module. The plasma display device is completed by assembling.

  Normally, the display filter is pasted so as to cover the image display area of the image display panel and the non-image display area around it, but the display filter having an electromagnetic wave shielding layer (conductive layer) is attached to the image display panel. In this case, in the non-image display region, the conductive layer of the display filter and the external electrode of the housing are electrically connected, and the conductive layer of the display filter is grounded.

  In order to electrically connect the conductive layer of the display filter and the external electrode of the housing, an electrode connected to the conductive layer at the outer peripheral edge (the portion corresponding to the non-image display area) of the display filter Has been made to form. As a method for forming such an electrode, the size of the functional film laminated on the conductive layer (the film obtained by laminating the functional surface layer on the plastic film) is made smaller than the size of the conductive layer, and the functionality is provided on the outer peripheral edge. Conventionally, a portion not covered with a film is provided to partially expose the conductive layer at the outer peripheral edge.

  The electrode provided on the display filter side is connected to the external electrode of the housing through a gasket or the like.

  The above-described conventional electrode forming method will be specifically described. Conventionally known display filters are formed by laminating a functional film having a functional surface layer and an electromagnetic wave shielding film having a conductive layer on a plastic film via an adhesive or the like. Has been. When laminating the functional film and the electromagnetic wave shielding film, a functional film having a size smaller than the electromagnetic wave shielding film is bonded so that the conductive layer is exposed at the outer edge of the electromagnetic wave shielding film. An electrode having a conductive layer exposed (exposed electrode) is formed on the outer peripheral edge of the filter for use.

  In order to provide the above-described bare electrodes on the four sides of the outer peripheral edge of the display filter, it is necessary to laminate an electromagnetic wave shielding film and a functional film between sheets. However, this lamination method has a disadvantage that it is inferior in productivity.

  On the other hand, a method of continuously laminating a roll-shaped electromagnetic shielding film and a roll-shaped optical functional film (roll lamination method), or functionality directly on the conductive layer of the roll-shaped electromagnetic shielding film The method of continuously coating the surface layer can greatly improve productivity. In particular, the latter method in which the functional surface layer is continuously coated directly on the electric layer can reduce the number of base materials made of a plastic film, and is advantageous in reducing the cost of a display filter.

  However, although the coating method described above can form the exposed electrode of the conductive layer at both ends parallel to the transport direction of the production line, it is exposed in the direction perpendicular to the transport direction of the production line. An electrode cannot be formed.

  Therefore, instead of forming the bare electrode, a method is known in which the functional surface layer is irradiated with a laser, the functional surface layer is removed, and the conductive layer is exposed (for example, Patent Documents 1 and 2).

  Patent Documents 1 and 2 describe that an elongated groove-like void is formed in a functional surface layer by irradiating a laser, and a conductive adhesive tape is attached to the void.

JP 2007-243158 A WO2008 / 029709

  As described in Patent Documents 1 and 2, when a gap is formed by a laser, a larger gap width is advantageous in that it is electrically connected to the conductive layer, but the gap width is increased. However, it is necessary to repeat the laser scanning several times, which is disadvantageous from the viewpoint of productivity.

  In particular, when the width of the gap is less than 2 mm, the conductive adhesive tape described in Patent Documents 1 and 2, that is, the conductive adhesive tape in which the conductive adhesive layer is laminated on the metal foil, is simply pasted. Then, the electrode could not be formed stably. In particular, the electrical conductivity between the conductive layer and the conductive adhesive tape decreased with time.

  Therefore, in view of the above-described conventional technology, the present invention is to provide a display filter having a stable electrode and a method for manufacturing the same, which is greatly reduced in terms of productivity and raw materials.

The above object of the present invention has been basically achieved by the following invention.
1) A display filter for mounting on a display image display panel,
The display filter has at least a substrate, a conductive layer, and a functional surface layer in this order,
At least part of the portion corresponding to the non-image display area of the image display panel has a gap that reaches the conductive layer from the functional surface layer and has a width of less than 2 mm,
A display filter, wherein the conductive member in any one of the following a), b), and c) is adhered to the gap through a conductive adhesive layer of the conductive member: .

  B) A conductive member in which a conductive pressure-sensitive adhesive layer is laminated on a cloth made of conductive fibers.

  B) A conductive member in which a conductive pressure-sensitive adhesive layer is laminated on a conductive plastic film having a metal plating on both sides of a plastic film having a plurality of through holes.

C) A conductive member having a conductive adhesive layer laminated on a release film.
2) The display filter according to 1), wherein the gap is provided in parallel and linearly with respect to at least two opposing sides of the four sides of the display filter.
3) The display filter according to 1) or 2), wherein the conductive member is attached so as to cover the entire space.
4) The functional surface layer is a functional layer having at least one function selected from an antireflection function, an antiglare function, a hard coat function, and an antifouling function, and is laminated directly on the conductive layer. The display filter according to any one of 1) to 3) above.
5) A method for producing a display filter for mounting on a display image display panel,
Step (A) of obtaining a laminate having at least a base material, a conductive layer, and a functional surface layer in this order,
At least a part of the laminated body corresponding to the non-image display area of the image display panel is irradiated with laser from the functional surface layer side, reaches the conductive layer from the functional surface layer, and has a width of less than 2 mm. A step (B) of forming a void;
It has at least a step (C) of adhering any of the conductive members in the following a), b) and c) through the conductive adhesive layer of the conductive member to the gap. A method for manufacturing a filter for display.

  B) A conductive member in which a conductive pressure-sensitive adhesive layer is laminated on a cloth made of conductive fibers.

  B) A conductive member in which a conductive pressure-sensitive adhesive layer is laminated on a conductive plastic film having a metal plating on both sides of a plastic film having a plurality of through holes.

C) A conductive member having a conductive adhesive layer laminated on a release film.
6) The step (A) of obtaining the laminate includes a step of further laminating a cover film on the functional surface layer,
The step of forming the void (B) is a step of irradiating a laser from the surface of the cover film to reach the conductive layer from the cover film surface and forming a void having a width of less than 2 mm,
The display according to 5), wherein the step (C) of attaching is a step of attaching the conductive member to the gap after peeling the cover film corresponding to the attachment region of the conductive member. Method for manufacturing filters.

  According to the present invention, it is possible to easily and stably form an electrode on a display filter in which a functional surface layer is directly laminated on a conductive layer, thereby greatly reducing the cost.

The top view of an example of the filter for displays of the present invention. 2a: A schematic cross-sectional view taken along the line AA of FIG. 1, FIG. 2b: An enlarged schematic cross-sectional view of the gap portion (an enlarged view around one gap portion shown in FIG. 2a). The top view of the other example of the filter for displays of this invention. The schematic plan view of an example of the manufacturing process of the laminated body for obtaining the filter for displays of this invention. The schematic cross section of the state by which the electroconductive member was stuck in the space | gap of this invention. 1 is an example of a plasma display to which a display filter of the present invention is applied (schematic cross-sectional view of main components). The other example of the plasma display to which the display filter of the present invention is applied (schematic cross-sectional view of main components).

  The display filter of the present invention is a display filter for mounting on a display image display panel, and has at least a base material, a conductive layer, and a functional surface layer in this order. And at least a part of the part corresponding to the non-image display area of the image display panel has a gap that reaches the conductive layer from the functional surface layer and has a width of less than 2 mm, and the gap includes the following a) Either one of the conductive members in (b) and (c) is attached via the conductive adhesive layer of the conductive member.

  The gap reaches the conductive layer from the functional surface layer, and the conductive layer is exposed in the gap. By sticking the specific conductive member of the present invention to this gap, the conductive layer and the conductive adhesive layer of the conductive member are in contact with each other, and the conductive layer is attached to the surface of the functional surface layer of the display filter. A conducting electrode can be formed.

  In the present invention, an electrode can be formed easily and stably by using the specific conductive member of the present invention even in a narrow gap having a width of less than 2 mm. On the other hand, when using a conductive tape known in the past, that is, a conductive tape in which a conductive pressure-sensitive adhesive layer is laminated on a metal foil such as copper or aluminum, for the formation of an electrode for a display filter, Due to the high rigidity, the electrodes cannot be stably formed simply by sticking the conductive tape to the gap.

Therefore, the present invention pays attention to the rigidity of the base material of the conductive member, and by using a highly flexible base material, the conductive adhesive of the conductive member against a narrow gap having a width of less than 2 mm. I found that the layer can be buried.
(Conductive member)
Below, the electroconductive member of a), b), and c) concerning this invention is demonstrated in detail.

  The conductive member (a) is a conductive member in which a conductive adhesive is laminated on a cloth made of conductive fibers. The conductive fiber used for the fabric made of such conductive fiber is not particularly limited, and any known one can be used.

  As such conductive fibers, for example, conductive fibers such as copper, nickel, aluminum, gold and silver are plated on natural fibers such as cotton and rayon, and yarns formed of synthetic fibers such as polyamide, polyester, acrylic and tetron. It can be obtained by coating a single layer or two or more layers by a method or a vapor deposition method. As another production example, conductive fibers can be obtained by mixing the above-described natural fibers and synthetic fibers with the conductive metal particles and fibers.

  The thickness of the fabric made of conductive fibers is preferably 5 μm or more, more preferably 10 μm or more, and particularly preferably 15 μm or more from the viewpoints of workability, handleability and strength of the fabric. In addition, if the thickness of the fabric becomes too large, the flexibility of the fabric is reduced, and the conductive layer may not be connected to the gap formed in the display filter with a width of less than 2 mm. The upper limit of the thickness is preferably less than 80 μm, more preferably less than 70 nm, and particularly preferably less than 60 μm.

A conductive pressure-sensitive adhesive layer is laminated on one side of a fabric made of conductive fibers. The conductive pressure-sensitive adhesive used for the conductive pressure-sensitive adhesive layer is not particularly limited, and known ones can be used. . For example, the thing in which electroconductive particle was disperse | distributed to the adhesive is mentioned. Examples of such conductive particles include particles of nickel, silver, copper, tin, aluminum, carbon, and the like. Adhesives include acrylic adhesives, rubber adhesives, silicone adhesives, urethane adhesives, epoxy adhesives, phenolic resins with curing agents, or cross-linked conductive adhesives. Can be mentioned. Examples of the crosslinkable pressure-sensitive adhesive include a postcrosslinkable adhesive containing a polymer mainly composed of an ethylene-vinyl acetate copolymer and the crosslinker.
About 30-300 mass parts is suitable with respect to 100 mass parts of adhesives for content of the electroconductive particle in a conductive adhesive layer, and 50-200 mass parts is preferable.
The thickness of the conductive pressure-sensitive adhesive layer is preferably 5 μm or more, more preferably 10 μm or more, and particularly preferably 15 μm or more from the viewpoint of sufficiently filling the gap formed in the display filter with a width of less than 2 mm. The upper limit of the thickness of the conductive pressure-sensitive adhesive layer is preferably less than 80 μm, more preferably less than 60 μm, and particularly preferably less than 50 μm from the viewpoint of reducing the level difference due to the conductive member on the display filter surface.
The conductive member (b) is a conductive member in which a conductive pressure-sensitive adhesive layer is laminated on a conductive plastic film having metal plating on both sides of a plastic film having a through hole.

  Such a plastic film is not particularly limited, and a known film can be used. Examples thereof include polyester films such as polyethylene terephthalate, polyolefin films such as polyethylene films, polypropylene films, and polybutylene films, polyacetylcellulose films, polyacrylic films, polycarbonate films, epoxy films, polyurethane films, and nylon films.

  The thickness of the plastic film is preferably 5 μm or more, more preferably 10 μm or more, and particularly preferably 15 μm or more from the viewpoint of strength. In addition, if the thickness of the plastic film becomes too large, the flexibility is lowered, and the conductive layer may not be electrically connected to the gap formed in the display filter with a width of less than 2 mm. The upper limit of the thickness is preferably less than 80 μm, more preferably less than 60 nm, and particularly preferably less than 50 μm.

Although the shape of the through-hole provided in a plastic film is not specifically limited, For example, a circle | round | yen, an ellipse, a triangle, a square, a polygon of 5-12, etc. are mentioned. The size of the through hole is suitably in the range of 0.5 to 5 mm as the maximum diameter, preferably in the range of 0.5 to 3 mm, and more preferably in the range of 0.5 to 2 mm. The number of through-holes is suitably about 1 to 20 per 1 cm ² of the plastic film, and is preferably in the range of 4 to 20.

  Metal plating is performed on both surfaces of the plastic film provided with a plurality of through holes as described above. Examples of such metal plating include vacuum deposition, chemical plating, sputtering, ion plating, chemical vapor deposition, and physical vapor deposition. The thickness of the metal plating is suitably in the range of 0.5 to 5 μm per side.

  As the metal to be plated, aluminum, silver, copper, nickel, chromium, or the like can be used.

  In the conductive plastic film formed as described above, conductivity between both sides of the plastic film is obtained through a plurality of through holes.

  As the conductive pressure-sensitive adhesive layer laminated on one surface of the conductive plastic film, the same conductive member as the above-mentioned conductive member (a) can be used.

  The conductive member c) is a conductive member in which a conductive adhesive layer is laminated on a release film. Since the release film used for such a conductive member is finally peeled and removed, it is important that it can be easily peeled off from the conductive pressure-sensitive adhesive layer. The release film is peeled before or after the display filter of the present invention is mounted on the image display panel and before the display casing is assembled. A preferable peeling time of the release film is after the display filter is mounted on the image display panel and before the casing is assembled.

  Such a release film is not particularly limited, and a known film can be used. For example, a plastic film having a known release agent, for example, a release agent such as silicone resin, long-chain alkyl resin, fluororesin, or wax, may be used. As a plastic film used for a release film, for example, a polyester film such as polyethylene terephthalate, a polyethylene film, a polyolefin film such as a polypropylene film, a polybutylene film, a polyacetyl cellulose film, a polyacryl film, a polycarbonate film, an epoxy film, A polyurethane film, a nylon film, etc. are mentioned.

  The thickness of the release film is preferably 5 μm or more from the viewpoint of strength, more preferably 10 μm or more, and particularly preferably 15 μm or more. Further, if the thickness of the release film becomes too large, the flexibility is lowered, and there is a case where the conductive layer cannot be connected to the gap formed in the display filter with a width of less than 2 mm. The upper limit of the thickness of the film is preferably less than 80 μm, more preferably less than 60 nm, and particularly preferably less than 50 μm.

As the conductive pressure-sensitive adhesive layer laminated on one surface of the release film, the same conductive member as the above-mentioned conductive member (a) can be used.
(Void)
The display filter of the present invention has a gap reaching from the functional surface layer to the conductive layer in at least a part of the portion corresponding to the non-image display area of the image display panel. The width of the gap is less than 2 mm. The conductive layer is exposed in the gap.

  The gap is preferably provided in a straight line substantially parallel to the side of the rectangular display filter. The air gap may be a linear continuous air gap or a broken-line discontinuous air gap.

  FIG. 1 shows a plan view of an example of a display filter in which voids are formed. A linear continuous gap 4 is formed substantially parallel to the four sides of the rectangular display filter 100. The gap 4 is formed in a region corresponding to the non-image display region of the image display panel. Reference numeral 5 denotes a boundary line between the image display area and the non-image display area. The inside of the boundary line 5 corresponds to the image display area of the image display panel, and the outside corresponds to the non-image display area.

  2A is a schematic cross-sectional view taken along the line AA of FIG. In the display filter of the present invention, a conductive layer 2 is formed on a substrate 1, and a functional surface layer 3 is laminated on the conductive layer 2. The gap 4 reaches the conductive layer 2 from the functional surface layer 3, and the conductive layer 3 is exposed in the gap 4.

  The gap is preferably an elongated groove-like gap. The width of the gap is less than 2 mm, but is preferably 1.5 mm or less. The lower limit of the gap width is preferably 0.3 mm or more, and more preferably 0.4 mm or more. In order to form a void having a width of 2 mm or more as described later, and the problem that the exposed surface of the conductive layer is increased and the conductive layer is easily oxidized and deteriorated when the width of the void is increased to 2 mm or more, laser operation is performed. There is a problem that the number of times needs to be increased and productivity is lowered. On the other hand, if the width of the gap is smaller than 0.3 mm, the conduction with the casing (external electrode) becomes insufficient, and a sufficient electromagnetic shielding effect may not be obtained. Here, the width of the gap is the opening width of the gap at the surface position of the functional surface layer.

  FIG. 2b is an enlarged schematic cross-sectional view of the gap portion (FIG. 2b is an enlarged view around one gap portion shown in FIG. 2a). The width of the gap in the present invention is the width (opening width) L at the surface position of the functional surface layer 3.

  The length of the gap on one side of the display filter is preferably 10% or more, more preferably 30% or more, and particularly preferably 50% or more with respect to 100% of the length of the display filter side. A higher ratio is preferable from the viewpoint of electromagnetic shielding performance, and the upper limit may be 100, but a substantial upper limit of about 99% is appropriate. The void in the present invention may be a linearly continuous void or a broken-line discontinuous void. In the case of the latter discontinuous gap, the total length becomes the target of the above ratio.

  Examples of the broken line-shaped discontinuous gap include a mode in which a plurality of gaps each having a length of 5 to 100 mm are linearly arranged with an interval length of 5 to 100 mm. In the above-mentioned discontinuous gap, the ratio (A / B) of the total length (A) of the gap per side of the display filter and the total length (B) of the gap-to-void gap is 0.5 to A range of 10 is suitable, and a range of 1 to 5 is preferred.

  The gap is preferably provided on at least two opposite sides of the four sides of the display filter. As shown in FIG. 1, it is more preferable to provide a gap on each of the four sides of the display filter.

  A gap and a conventional bare electrode can be combined. For example, as shown in FIG. 3, voids can be formed on two opposite short sides of the display filter, and exposed electrodes can be formed on two opposite long sides. Here, when the functional surface layer is applied and formed on the conductive layer, the bare electrode functions at both ends of the conductive layer by reducing the coating width of the functional surface layer relative to the width of the conductive layer. It can form by providing the uncoated part of a conductive surface layer. In FIG. 3, reference numeral 6 denotes a bare electrode.

  Further, a conventional bare electrode can be formed on one side, and a gap can be formed on the remaining three sides. In this aspect, from the viewpoint of improving production efficiency, when the functional surface layer is applied on the conductive layer, the width of the conductive layer is set so that two display filters can be taken in the width direction of the conductive layer. The exposed electrode is formed on one side of the display filter by providing a wide width and providing an uncoated portion of the functional surface layer at both ends in the width direction of the conductive layer.

  The specific embodiment is shown in FIG. FIG. 4 is a schematic plan view of a process of manufacturing a laminate of a base material, a conductive layer, and a functional surface layer in the manufacturing process of the display filter. When the functional surface layer is applied on the conductive layer of the long conductive layer laminated base material 11 in which the conductive layer is formed on the base material, the coating width of the functional surface layer is adjusted to adjust the length of the functional surface layer. The uncoated part 12 of a functional surface layer is formed at both ends in the width direction of the conductive layer laminated substrate 11. The width of the long conductive layer laminated substrate 11 is such that two surfaces of the display filter 100 can be taken. As a result, the bare electrode 6 is formed on one side of the display filter 100. And the display filter of the said aspect can be obtained by forming the space | gap mentioned above in the remaining 3 sides of the filter 100 for displays.

(Void formation method)
In the present invention, there is no particular limitation on the method of forming a void that reaches the conductive layer from the functional surface layer and has a width of less than 2 mm. For example, there are a method using a cutter blade such as a knife, a method for removing a functional surface layer using an ultrasonic soldering iron, a method for dry etching a functional surface layer, a method using a laser, etc. Is preferably used.

  In the present invention, it is preferable to form voids without peeling off the functional surface layer and the like located on the conductive layer by a physical method, and the voids are formed by evaporating or burning organic substances such as the functional surface layer. The forming method is preferably used. As such a method, a method of irradiating a laser from the functional surface layer side is optimal.

The method of irradiating with laser has the advantages that a gap can be formed without physical contact with the display filter, that the gap can be stably formed with a substantially constant width, and that the control of the depth direction of the gap can be accurately performed. is there. Examples of such laser output sources include iodine, YAG, and CO _2. Particularly, the CO ₂ laser can accurately control the gap width and gap depth, and the conductive layer made of metal is not destroyed. It is preferable in that a void can be formed by evaporating and burning the functional surface layer and the like.

  When the air gap is formed by laser irradiation, the width and depth of the air gap can be controlled by adjusting the focal position of the laser, the output of the laser, and the scanning speed (head speed) of the laser. The width of the gap can be further controlled by adjusting the number of scans, but the gap desired by the present invention can be formed even by one scan.

  The width of the gap according to the present invention is less than 2 mm. In order to form a gap having a width of 2 mm or more using a laser, it is necessary to increase the number of times of laser scanning, and the production efficiency is lowered.

(Attachment of conductive member to gap)
The conductive member according to the present invention described above is stuck to the gap through the conductive adhesive layer. And it is preferable that a conductive member is stuck through a conductive adhesive layer so that the whole region of a space | gap may be coat | covered. FIG. 5 is a schematic cross-sectional view showing a state in which a conductive member is attached to the gap. The conductive member 20 is formed by laminating a base material 21 and a conductive pressure-sensitive adhesive layer 22. Here, the base material 21 is made of conductive fibers when the conductive member is the conductive member b). The cloth is a conductive plastic film in the case of the conductive member b), and a release film in the case of the conductive member c).

  Since the conductive member is preferably pasted so as to cover the gap according to the present invention, that is, the gap having a width of less than 2 mm, the width of the conductive member and the conductive adhesive layer is 2 mm or more. However, in consideration of handling of the conductive member and sticking workability, the width of the conductive member and the conductive adhesive layer is preferably 3 mm or more, and particularly preferably 5 mm or more. The upper limit of the width of the conductive member and the conductive adhesive layer is preferably smaller than the portion corresponding to the non-image display region of the image display panel of the display filter, specifically 25 mm or less, preferably 20 mm or less. More preferably, it is further preferably 15 mm or less.

  The lengths of the conductive member and the conductive adhesive layer are preferably equal to or longer than the length of the gap formed on one side of the display filter.

(Connection between display filter electrode and housing external electrode)
As described above, at least part of the portion of the display filter corresponding to the non-image display area of the image display panel is taken out of the ground electrode by the conductive member in conduction with the conductive layer through the gap. The sexual member becomes an electrode. The electrode of this display filter is connected to the external electrode of the housing and grounded.

  Conventionally, it is known to electrically connect a display filter electrode and an external electrode by interposing a gasket between the display filter electrode and a housing external electrode.

  FIG. 6 is a schematic cross-sectional view of the main components of an example of a plasma display to which the present invention can be applied. In FIG. 6, the display filter 100 is affixed to the image display panel 31, and the front cover 32 of the housing covers the display filter 100 on the outer periphery (non-image display area) of the image display area of the image display panel 31. The image display panel 31 is assembled so as to be pressed. A gasket 33 is disposed between the display filter 100 and the front cover 32, and the gasket 33 is an electrode (conductive member 20 of the present invention) provided on the display filter 100 and an external electrode (see FIG. (Not shown) are electrically connected and grounded. Here, the electrode provided in the display filter 100 is obtained by attaching the conductive member 20 of the present invention to a gap (not shown).

  The gasket used in the embodiment of FIG. 6 is obtained by, for example, winding a fabric woven of conductive fibers around an elastic member (for example, sponge or rubber).

  In addition, the display filter of the present invention is mounted on the display image display panel, and the conductive layer and the external electrode of the casing (for example, aluminum) are interposed through the gap formed in the display filter without interposing the gasket. Plate) with a conductive member. This aspect can be realized by arranging the external electrodes so that the display filter and the external electrodes mounted on the display image display panel are substantially on the same plane. A schematic cross-sectional view of this embodiment is shown in FIG.

  In FIG. 7, the external electrode 34 made of an aluminum plate is arranged on the same plane as the display filter 100, and the conductive member 20 of the present invention constituting the electrode of the display filter 100 is used as the display filter 100. Is attached so as to connect the external electrode 34 to a gap (not shown) provided in the structure.

(Cover film)
The display filter of the present invention is preferably laminated so that a peelable cover film covers the functional surface layer in order to protect the functional surface layer. By laminating the cover film on the functional surface layer, the functional surface layer can be protected in the display filter manufacturing process, the display image display panel manufacturing process, and the display assembly process. The cover film is finally peeled and removed, and thus the cover film is detachably laminated. Here, peelable means that the functional surface layer can be peeled relatively easily without damaging the cover film, and that the adhesive of the cover film does not remain on the functional surface layer side when the cover film is peeled off. is important.

  Various plastic films can be used as the cover film that can be used in the present invention. For example, polyester films such as polyethylene terephthalate, polyolefin films such as polyethylene film, polypropylene film, polybutylene film, polyacetylcellulose film, polyacryl film, polycarbonate film, epoxy film, polyurethane film, etc. A film or a polyolefin film is preferably used.

  Since the cover film is finally peeled off from the display filter, a peelable pressure-sensitive adhesive or adhesive is used. Or when using the film which has adhesiveness as a cover film, an adhesive material etc. are unnecessary.

  The thickness of the cover film (including the adhesive layer when an adhesive layer for lamination is required) is preferably in the range of 20 to 80 μm.

  Lamination of the cover film may include further laminating a cover film on the functional surface layer in the step (A) of obtaining a laminate having at least a base material, a conductive layer, and a functional surface layer in this order. Preferably, more specifically, in the functional surface layer coating step, the functional surface layer is coated on the conductive layer, dried, cured as necessary, and then covered on the functional surface layer before winding. Film lamination is preferred.

  The void according to the present invention is preferably formed in a state where the cover film is laminated on the functional surface layer. For example, in the step (B) of forming a void to be described later, a laser beam can be irradiated from the surface of the cover film to form a void having a width that reaches the conductive layer from the cover film surface of less than 2 mm. By irradiating a laser from the cover film surface to form a void, it is possible to prevent re-deposition of the transpiration material such as a functional surface layer generated by the laser irradiation to the display filter.

  In the step (C) of attaching a conductive member to be described later, after the gap is formed from above the cover film, before attaching the conductive member of the present invention to the gap, at least the conductive member attachment region. It is preferable to adhere the conductive member to the gap after peeling the cover film of the part corresponding to, but at this time, the cover film of at least the part corresponding to the image display area is left without peeling, and the conductive member It is preferable to peel the cover film within a range that does not affect the sticking.

  The range that does not affect the sticking of the conductive member means an area slightly larger than the sticking region of the conductive member. Specifically, the gap is formed in a portion corresponding to the non-image display area, and the conductive member attaching area is also in the non-image display area. It is preferable to leave the cover film in the display area.

  The purpose of the cover film is to protect the functional surface layer, and more specifically, to protect the functional surface layer in the portion corresponding to the image display area. From this viewpoint, the cover film corresponds to the image display area. It is preferable that the cover film in the area to be peeled and removed in a later step as much as possible.

  Therefore, the cover film in the region corresponding to the image display region is peeled off by providing a cut line in the cover film at the boundary line between the region corresponding to the image display region of the display filter and the region corresponding to the non-image display region. It becomes possible to delay.

  That is, by providing a cut line on the cover film at the boundary line between the area corresponding to the image display area of the display filter and the area corresponding to the non-image display area, only the cover film in the area corresponding to the non-image display area is provided. It is possible to peel off and leave the cover film in an area corresponding to the image display area.

  The cut line provided on the cover film is provided along the boundary line between the image display area and the non-image display area. Here, the boundary line between the image display area and the non-image display area indicates a strict boundary line. Instead, it means the vicinity of the boundary line.

  The purpose of laminating the cover film is to protect the functional surface layer of the image display region as described above. In this sense, the cut line provided in the cover film is not on the boundary line or on the boundary line. The position is preferably shifted to the image display area side. When the cut line is set at a position shifted from the boundary line to the non-image display region side, it is preferably set so as not to obstruct the sticking of the conductive member to the gap. The amount of shift of the cut line from the boundary line is, for example, about 1 to 5 mm, and preferably in the range of 1 to 3 mm.

  The cut line of the cover film is intended to divide the image display area and the non-image display area of the cover film along the cut line. Therefore, the depth and shape of the cut line can achieve the above purpose. Should be set.

  The depth of the score line can be achieved without necessarily penetrating the cover film (the plastic film part if the cover film includes an adhesive layer), but it can penetrate the cover film (plastic film part). This is preferable because the non-image display area can be easily peeled off.

  The planar shape of the cut line is preferably a continuous line, but may be a discontinuous line such as a perforation. In the case of the discontinuous line, the length of one discontinuous portion needs to be small so that the cover film can be easily torn off, and the length of one discontinuous portion is preferably 2 mm or less, and preferably 1 mm or less. More preferred.

  The score line can be formed with a cutter blade, but is preferably formed by irradiating a laser. The above-described method of forming a gap with a laser can be applied to the formation of the cut line by the laser. That is, laser irradiation conditions (laser focal position, laser output, laser scanning speed, etc.) can be adjusted and used. The formation of the score line by the laser can reproduce the depth of the score line accurately and stably. That is, a cut line penetrating the cover film can be formed with almost no damage to the functional surface layer.

  In the present invention, it is preferable to combine the formation of voids by laser and the formation of cut lines by laser. Accordingly, it is possible to form a gap and form a cut line in a state where a display filter in which a cover film is laminated is mounted (fixed) on one laser device. There is no particular limitation on the order in which the voids are formed and the cut lines are formed.

Separation of the part corresponding to the non-image display area divided by the cut line of the cover film is performed before adhering the conductive member to the gap, but peeling of the part corresponding to the image display area is for display. This is performed after the filter is mounted on the image display panel and before the front cover of the housing is assembled.
(Configuration of display filter)
It is important that the display filter of the present invention has a base material, a conductive layer, and a functional surface layer in this order. More preferably, it is an embodiment having a conductive layer on a substrate and further having a functional surface layer on the conductive layer.

(Base material)
As a base material used for the display filter of the present invention, a plastic film is preferable. Examples of the resin constituting the plastic film include polyester resins such as polyethylene terephthalate and polyethylene naphthalate, cellulose resins such as triacetyl cellulose, polyolefin resins such as polyethylene, polypropylene, and polybutylene, acrylic resins, polycarbonate resins, arton resins, and epoxy resins. , Polyimide resin, polyetherimide resin, polyamide resin, polysulfone resin, polyphenylene sulfide resin, polyether sulfone resin, and the like. Among these, a polyester resin, a polyolefin resin, and a cellulose resin are preferable, and a polyester resin is particularly preferably used. In addition, the plastic film formed of the above resin may have a single layer structure or a laminated structure.

  As the thickness of the plastic film, a range of 50 to 300 μm is appropriate, but a range of 90 to 250 μm is particularly preferable from the viewpoint of cost and ensuring the rigidity of the display filter.

  The display filter according to the present invention preferably has only one base material, and preferably only one plastic film is used as the base material.

The plastic film used in the present invention is provided with a primer layer (undercoat layer, easy adhesion layer) for enhancing adhesion (adhesion strength) with the conductive layer described above or a near infrared shielding layer described later. (In other words, the substrate is preferably a plastic film having a primer layer (undercoat layer, easy adhesion layer)).
(Conductive layer)
The conductive layer in the present invention is a layer for shielding electromagnetic waves generated from the display, and the surface resistance value of the conductive layer is preferably low. The sheet resistance value of the conductive layer is preferably 5Ω / □ or less, more preferably 3Ω / □ or less, and particularly preferably 1Ω / □ or less. Also, the lower the sheet resistance, the better the electromagnetic shielding properties are improved, but the practical lower limit is considered to be about 0.01Ω / □. The sheet resistance value of the conductive layer can be measured by a four-terminal method.

  As the conductive layer according to the present invention, a metal thin film or a conductive mesh can be used. In the present invention, a conductive layer having a conductive mesh is preferable, and at least an image display region is more preferably a conductive layer made of a conductive mesh. In this case, both the image display area and the non-image display area may be formed of a conductive mesh, or the image display area may be formed of a conductive mesh and the non-image display area may be formed of a solid metal.

  The conductive layer having a conductive mesh which is a preferred embodiment of the present invention will be described in detail below.

  In order to improve the electromagnetic wave shielding properties, the thickness of the conductive mesh needs to be increased to some extent, but conversely, if the thickness becomes too large, the coating property of the functional surface layer, which will be described later, is reduced, and coating stripes and unevenness are not observed. May occur. Also, if the thickness of the conductive mesh becomes too large, it is necessary to increase the thickness of the functional surface layer in order to ensure the coatability of the functional surface layer, especially when a hard coat layer is used as the functional surface layer. May be difficult to process due to curling. Further, if the thickness of the conductive mesh becomes too large, the transmitted image sharpness tends to decrease.

  From the above viewpoint, the thickness of the conductive mesh is preferably in the range of 0.5 to 8 μm, more preferably in the range of 1 to 5 μm, and particularly preferably in the range of 1 to 3 μm. When the thickness of the conductive mesh is less than 0.5 μm, sufficient electromagnetic shielding properties may not be obtained. Further, if the thickness of the conductive mesh exceeds 8 μm, the coating property of the functional surface layer is lowered, so that it is difficult to stably form the functional surface layer having a uniform surface roughness in the surface. This is not preferable because it tends to increase the cost.

  The shape of the mesh pattern of the conductive mesh (the shape of the opening) is, for example, a lattice mesh pattern formed of a quadrangle such as a square, a rectangle, or a rhombus, a triangle, a pentagon, a hexagon, an octagon, or a dodecagon. Examples thereof include a mesh pattern made of a polygon, a mesh pattern made of a circle and an ellipse, a mesh pattern made of the composite shape, and a random mesh pattern. Among these, from the viewpoint of ease of production of the conductive mesh, a lattice mesh pattern having a quadrangular shape is preferable.

  The pitch of the conductive mesh is preferably in the range of 50 to 500 μm, more preferably in the range of 75 to 450 nm, and still more preferably in the range of 100 to 350 μm. If the pitch of the conductive mesh is smaller than 50 μm, the transmittance tends to decrease. If the pitch is larger than 500 μm, the conductivity tends to decrease, which is not preferable. Note that the pitch of the conductive mesh means that one opening having a conductive mesh (a portion surrounded by a thin line and a thin line of the conductive mesh) and an adjacent opening sharing one side with this opening. The distance between the centers of gravity.

  The line width of the conductive mesh is preferably in the range of 3 to 30 μm, and more preferably in the range of 5 to 20 μm. When the line width of the conductive mesh is smaller than 3 μm, the electromagnetic shielding property tends to be lowered. On the other hand, when the line width is larger than 30 μm, the transmittance of the display filter tends to be lowered.

  As a method for forming a conductive layer having a conductive mesh on a substrate, a known method can be used. For example, 1) A method of printing a conductive ink in a pattern on a substrate. 2) Method of plating after pattern printing with ink containing catalyst core of plating, 3) Method of using conductive fiber, 4) Method of patterning after bonding metal foil on base material with adhesive, 5) A method of patterning after forming a metal thin film on a substrate by vapor deposition or plating, 6) a method using a photosensitive silver salt, 7) a method of laser ablating a metal thin film, and 8) on a printed pattern Examples include, but are not limited to, a method of developing after metal film lamination.

  The manufacturing method of the conductive layer having the conductive mesh will be described in detail.

  1) The method of printing the conductive ink in a pattern on the substrate is a method of printing the conductive ink in a pattern on the substrate by a known printing method such as screen printing or gravure printing.

  2) A method of performing plating after pattern printing with ink containing catalyst nuclei for plating is, for example, printing in a pattern using a catalyst ink made of a palladium colloid-containing paste and immersing this in an electroless copper plating solution. Electroless copper plating, followed by electrolytic copper plating, and further by electrolytic plating of a Ni-Sn alloy to form a conductive mesh pattern.

  3) A method using conductive fibers is a method in which a knitted fabric made of conductive fibers is bonded through an adhesive or an adhesive.

  4) The method of patterning after laminating a metal foil on a base material with an adhesive is performed by laminating a metal foil (copper, aluminum, nickel, etc.) on the base material via an adhesive or an adhesive, This metal foil is a method of etching a metal foil after producing a resist pattern using a photolithography method or a screen printing method. As a method for forming the above resist pattern, a photolithography method is preferable, and the photolithography method is a method of applying a photosensitive resist on a metal foil or laminating a photosensitive resist film, adhering a pattern mask, and exposing, This is a method of forming an etching resist pattern by developing with a developing solution, and further eluting metals other than the pattern portion with an appropriate etching solution to form a desired conductive mesh.

  5) A method of patterning after forming a metal thin film on a substrate by vapor deposition or plating is performed by using a metal thin film (copper, aluminum, silver, gold, palladium, indium, tin, or silver on the substrate). Other metal alloys) are formed by vapor deposition methods such as vapor deposition, sputtering, ion plating, etc., or plating methods, and this metal thin film is used by photolithography or screen printing. Then, after the resist pattern is prepared, the metal thin film is etched. As a method of forming the above resist pattern, a photolithography method is preferable, and the photolithography method is a method of applying a photosensitive resist on a metal thin film or laminating a photosensitive resist film, adhering a pattern mask, and exposing, This is a method of forming an etching resist pattern by developing with a developing solution, and further eluting metals other than the pattern portion with an appropriate etching solution to form a desired conductive mesh. In this method, it is preferable to form a metal thin film on a substrate without using an adhesive or a pressure-sensitive adhesive.

  6) A method using a photosensitive silver salt is a method in which a silver salt emulsion layer such as silver halide is coated on a transparent substrate, and after photomask exposure or laser exposure, development processing is performed to form a silver mesh. is there. The formed silver mesh is preferably further plated with a metal such as copper or nickel. This method is described in WO 2004/7810, JP-A 2004-221564, JP-A 2006-12935, and the like, and can be referred to.

  7) The method of laser ablating a metal thin film is a method of producing a metal thin film mesh pattern by laser ablation of a metal thin film formed on a substrate in the same manner as in 5) above.

  Laser ablation means that when a solid surface that absorbs laser light is irradiated with laser light with a high energy density, the bonds between the irradiated parts are broken and evaporated, causing the solid surface of the irradiated part to break. It is a phenomenon that is cut away. By utilizing this phenomenon, the solid surface can be processed. Since laser light is highly straight and condensing, it is possible to selectively process a fine area about 3 times the wavelength of the laser light used for ablation, and high processing accuracy is obtained by the laser ablation method. I can do it.

  The laser used for such ablation can be any laser having a wavelength that is absorbed by the metal. For example, a gas laser, a semiconductor laser, an excimer laser, or a solid laser using a semiconductor laser as an excitation light source can be used. A second harmonic light source (SHG), a third harmonic light source (THG), or a fourth harmonic light source (FHG) obtained by combining these solid-state lasers and a nonlinear optical crystal can be used.

  Among such solid-state lasers, an ultraviolet laser having a wavelength of 254 nm to 533 nm is preferably used from the viewpoint of not processing a plastic film. Among them, it is preferable to use a solid laser SHG (wavelength 533 nm) such as Nd: YAG (neodymium: yttrium, aluminum, garnet), and more preferably a solid laser THG (wavelength 355 nm) ultraviolet laser such as Nd: YAG. .

  8) The development method after forming the metal film on the printed pattern is the same method as in 5) above, except that the reverse pattern of the mesh pattern is printed on the substrate and the metal thin film is printed on the printed pattern. And forming a metal mesh pattern by peeling off the resin and the metal film thereon. As the peelable resin, a resin or resist that is soluble in water, an organic solvent, or an alkali can be used. This method is described in JP-A No. 2001-185834, JP-A No. 2001-332889, JP-A No. 2003-243881, JP-A No. 2006-140346, JP-A No. 2006-156642, and the like. it can.

  Among the above-described methods for producing a conductive mesh, a conductive mesh having a relatively small thickness (for example, a conductive mesh having a thickness of 8 μm or less) can be easily produced, and high electromagnetic shielding properties can be secured. The production methods 2), 5), 6) and 7) above are preferably used. In addition, from the viewpoint of the coating property of the functional surface layer and the adhesion between the functional surface layer and the conductive layer, the conductive mesh produced by the production methods of 2), 5) and 7) above is preferred. Used. In particular, the production method 5) is particularly preferably used because the coating property of the functional surface layer is good and the production cost of the conductive mesh is low.

  The production method 5) will be described in more detail.

  As a method for forming a metal thin film on a substrate, a vapor deposition method is preferred. Examples of the vapor deposition method include sputtering, ion plating, electron beam vapor deposition, vacuum vapor deposition, and chemical vapor deposition. Among these, sputtering and vacuum vapor deposition are preferable. As a metal for forming a metal thin film, an alloy or a multilayer of one or more of metals such as copper, aluminum, nickel, iron, gold, silver, stainless steel, chromium and titanium is used. can do. Among these, copper is preferably used from the viewpoints of obtaining good electromagnetic shielding properties, easy mesh pattern processing, and low cost.

  Moreover, when using copper as a metal of a metal thin film, it is preferable to use a nickel thin film with a thickness of 5-100 nm between a base material and a copper thin film. Thereby, the adhesiveness of a transparent base material and a copper thin film improves. Further, a metal compound such as a metal oxide, metal nitride, or metal sulfide can be laminated on the surface of the metal thin film by a vapor deposition method. This metal compound lamination is preferable because the blackening treatment described later can be omitted. Examples of such metal compounds include gold, platinum, silver, mercury, copper, aluminum, nickel, chromium, iron, tin, zinc, indium, palladium, iridium, cobalt, tantalum, antimony, titanium, and other metal oxides, nitriding Or sulfide. The thickness of the metal compound is preferably in the range of 5 to 200 nm, more preferably in the range of 10 to 100 nm. This metal compound layer constitutes a part of the metal thin film and further constitutes a part of the conductive mesh.

  As a method for forming a resist pattern on the metal thin film, photolithography is preferably used. In such a photolithography method, a photosensitive resist layer is laminated on a metal thin film, the resist layer is exposed to a mesh pattern, developed to form a resist pattern, and then the metal thin film is etched to form a mesh pattern. In this method, the resist layer on the mesh is peeled and removed. As the photosensitive resist layer, a negative resist in which the exposed portion is cured or a positive resist in which the exposed portion is dissolved by development can be used. The photosensitive resist layer may be coated and laminated directly on the metal thin film, or a film made of a photoresist may be bonded. As a method for exposing the photoresist layer, there can be used a method of exposing with an ultraviolet ray or the like through a photomask, or a method of directly scanning and exposing using a laser.

  Further, the resist layer can be blackened by containing a black pigment such as carbon black or titanium black. This black resist layer is preferably left as it is on the conductive mesh without being removed, so that the blackening treatment described later can be omitted. Etching methods include chemical etching methods. Chemical etching is a method in which a metal other than a metal portion protected by a resist pattern is dissolved and removed with an etching solution. Examples of the etching solution include a ferric chloride aqueous solution, a cupric chloride aqueous solution, and an alkaline etching solution.

The conductive mesh according to the present invention is preferably blackened. By applying a blackening treatment, reflection from the viewer side and reflection from the display side due to the metallic luster of the conductive mesh can be reduced, and further reduction in image visibility can be reduced. An excellent display filter can be obtained.
(Functional surface layer)
The functional surface layer concerning this invention is a layer arrange | positioned at the outermost surface at the side of a conductive layer with respect to a base material. Such a functional surface layer preferably has at least one function selected from an antireflection function, an antiglare function, a hard coat function, and an antifouling function. The functional surface layer may be a single layer or a plurality of layers, or may be a layer having a plurality of functions.

  In the present invention, the functional surface layer is preferably laminated directly on the conductive layer, and in particular, the functional surface layer is preferably formed directly on the conductive layer.

  By laminating the functional surface layer directly on the conductive layer, and further by direct coating, it is possible to use only one substrate for the display filter, thus reducing raw material costs. And since a bonding process becomes unnecessary, production efficiency improves, and also electrode formation (formation of a space | gap) by the laser mentioned above can be performed easily.

The layer having an antireflection function, an antiglare function, a hard coat function, and an antifouling function constituting the functional surface layer will be specifically described below.
(Antireflection layer)
The layer having an antireflection function (antireflection layer) prevents reflection or reflection of external light such as a fluorescent lamp that affects the image display of the display. The antireflection layer preferably has a surface luminous reflectance of 4% or less, more preferably 3% or less, and particularly preferably 2% or less. Here, the luminous reflectance is a luminous reflectance (Y) calculated according to the CIE1931 system by measuring the reflectance in the visible region wavelength (380 to 780 nm) using a spectrophotometer or the like.

The antireflection layer may be a single layer having only a low refractive index layer, or may be a laminated structure of a low refractive index layer and a high refractive index layer. In the laminated structure, the high refractive index layer is disposed on the conductive layer side.
The refractive index of the low refractive index layer is preferably in the range of 1.25 to 1.49, particularly preferably in the range of 1.3 to 1.45. The refractive index of the high refractive index layer is preferably in the range of 1.5 to 1.75, particularly preferably in the range of 1.55 to 1.70.
(Low refractive index layer)
As a method for forming a low refractive index layer, 1) a method of forming a thin film such as MgF ₂ or SiO ₂ by a vapor phase method such as vacuum deposition, sputtering, plasma CVD, or the like, and 2) combining with silica-based fine particles. Examples thereof include a method of thermally curing a siloxane polymer as a main component and a layer, and 3) a method of curing an active energy ray-curable resin layer containing a fluorine-containing compound or silica-based fine particles. Among these, the methods 2) and 3) are preferable, and the method 3) is particularly preferable.
The method of thermosetting the main component and the layer of the siloxane polymer formed by bonding with the silica-based fine particles of the above 2) will be described.

  The term “bond” as used herein means a state in which the silica component of the silica-based fine particles and the siloxane polymer in the matrix are reacted and homogenized. A siloxane polymer formed by combining with silica-based fine particles once forms a silanol compound by a known hydrolysis reaction with a polyfunctional silane compound in a solvent and an acid catalyst in the presence of the silica-based fine particles. It can be obtained by utilizing the reaction.

  The polyfunctional silane compound preferably includes a polyfunctional fluorine-containing silane compound from the viewpoint of low refractive index and antifouling properties, and includes trifluoromethylmethoxysilane, trifluoromethylethoxysilane, and trifluoropropyltrimethoxy. Trifunctional fluorine-containing silane compounds such as silane, trifluoropropyltriethoxysilane, heptadecafluorodecyltrimethoxysilane, tridecafluorooctyltrimethoxysilane, heptadecafluorodecyltriethoxysilane, tridecafluorooctyltriethoxysilane, Examples include bifunctional fluorine-containing silane compounds such as heptadecafluorodecylmethyldimethoxysilane, all of which are preferably used. From the viewpoint of surface hardness, trifluoromethylmethoxysilane, trifluoro Chill silane, trifluoropropyl trimethoxy silane, trifluoropropyl triethoxy silane, more preferably.

  The silica-based fine particles are preferably silica-based fine particles having an average particle diameter of 1 nm to 200 nm, and particularly preferably an average particle diameter of 1 nm to 70 nm. When the average particle diameter is less than 1 nm, the bond with the matrix material becomes insufficient and the hardness may be lowered. On the other hand, if the average particle diameter exceeds 200 nm, the generation of voids between particles caused by introducing a large amount of particles is reduced, and the effect of lowering the refractive index may not be sufficiently exhibited. Further, among these silica-based fine particles, those having a structure having a cavity inside are particularly preferably used in order to lower the refractive index.

  Examples of such silica-based fine particles having cavities therein include silica-based fine particles having a hollow portion surrounded by an outer shell, porous silica-based fine particles having a large number of hollow portions, and the like. As such an example, for example, it can be produced by the method disclosed in Japanese Patent No. 3272111, and the volume occupied by the cavities inside the fine particles, that is, the porosity of the fine particles is preferably 5% or more, more preferably 30% or more. preferable. The porosity can be measured using, for example, a mercury porosimeter (trade name: Bore Sizer 9320-PC2, manufactured by Shimadzu Corporation). Further, the refractive index of the fine particles themselves is preferably 1.20 to 1.40, more preferably 1.20 to 1.35. Examples of such silica-based fine particles include those disclosed in Japanese Patent Application Laid-Open No. 2001-233611, and those commercially available such as Japanese Patent No. 3272111.

  A method for curing the active energy ray-curable resin layer containing the fluorine-containing compound and silica-based fine particles in the above 3) will be described.

The fluorine-containing compound and the silica-based fine particles may be used alone, but are preferably used in combination.
Examples of the fluorine-containing compound include a fluorine-containing monomer and a fluorine-containing polymer compound.

  Examples of the fluorine-containing monomer include 2,2,2-trifluoroethyl (meth) acrylate, 2,2,3,3,3-pentafluoropropyl (meth) acrylate, 2- (perfluorobutyl) ethyl (meth) ) Acrylate, 2- (perfluorohexyl) ethyl (meth) acrylate, 2- (perfluorooctyl) ethyl (meth) acrylate, 2- (perfluorodecyl) ethyl (meth) acrylate, and other fluorine-containing (meth) acrylic acids Examples include esters.

  Examples of the fluorine-containing polymer compound include a fluorine-containing copolymer having a fluorine-containing monomer and a monomer for imparting a crosslinkable group as constituent units. Specific examples of the fluorine-containing monomer unit include, for example, fluoroolefins (for example, fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoroethylene, hexafluoropropylene, perfluoro-2,2-dimethyl-1,3-dioxole, etc. ), (Meth) acrylic acid partial or fully fluorinated alkyl ester derivatives (for example, Biscoat 6FM (manufactured by Osaka Organic Chemicals) and M-2020 (manufactured by Daikin)), fully or partially fluorinated vinyl ethers, and the like. As a monomer for imparting a crosslinkable group, in addition to a (meth) acrylate monomer having a crosslinkable functional group in the molecule like glycidyl methacrylate, it has a carboxyl group, a hydroxyl group, an amino group, a sulfonic acid group, etc. ) Acrylate monomers (for example, (meth) acrylic acid, methylol (meth) acrylate, hydroxyalkyl (meth) acrylate, allyl acrylate, etc.).

  As silica-based fine particles, silica-based fine particles having cavities in the interior used in the above method 2) are preferably used.

  The active energy ray-curable resin is polymerized and cured by irradiation with active energy rays to form a resin layer having a low refractive index layer. Here, active energy rays refer to ultraviolet rays, electron rays, radiation (α rays, β rays, γ rays, etc.) and the like. Practically, electron rays and ultraviolet rays are preferable, and ultraviolet rays are particularly simple and preferable. As the ultraviolet ray source, an ultraviolet fluorescent lamp, a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a xenon lamp, a carbon arc lamp, or the like can be used. Moreover, when irradiating an active energy ray, if it irradiates under a low oxygen concentration, it can harden | cure efficiently. The electron beam irradiation method is advantageous in that the apparatus is expensive and needs to be operated under an inert gas, but it does not need to contain a photopolymerization initiator or a photosensitizer in the coating solution. is there.

  As the resin component used in the active energy ray-curable resin layer, a polyfunctional (meth) acrylate compound having two or more (meth) acryloyl groups in the molecule is preferably used. Furthermore, polyfunctional (meth) acrylate compounds having 3 or more (meth) acryloyl groups in the molecule are preferred, and polyfunctional (meth) acrylate compounds having 3 to 10 acryloyl groups in the molecule are particularly preferred.

  Examples of such polyfunctional (meth) acrylate compounds include ethylene glycol di (meth) acrylate, dicyclopentenyl di (meth) acrylate, triethylene glycol diacrylate, tetraethylene glycol di (meth) acrylate, and tricyclodecanediyl dimethy. Range (meth) acrylate, tris (2-hydroxyethyl) isocyanurate di (meth) acrylate, tripropylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, both ends (meth) of bisphenol A diglycidyl ether Acrylic acid adduct, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylo Rupropane tri (meth) acrylate, glycerol tri (meth) acrylate, ethylene-modified trimethylolpropane tri (meth) acrylate, tris- (2-hydroxyethyl) -isocyanuric acid ester tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, Examples thereof include dipentaerythritol penta (meth) acrylate and dipentaerythritol hexa (meth) acrylate. In the present invention, “... (Meta) acrylic ...” is an abbreviation of “... acrylic ... or meta acrylic ...”.

  Among the above polyfunctional (meth) acrylate compounds, polyfunctional (meth) acrylate compounds having 3 or more (meth) acryloyl groups in the molecule are preferable, and polyfunctional (having 3 to 10 acryloyl groups in the molecule) ( A (meth) acrylate compound is preferably used.

In order to accelerate the polymerization and curing of the polyfunctional (meth) acrylate compound, it is preferable to include a photopolymerization initiator in the active energy ray-curable resin layer.
As such photopolymerization initiator, specific examples of the photopolymerization initiator include acetophenone, 2,2-diethoxyacetophenone, p-dimethylacetophenone, p-dimethylaminopropiophenone, benzophenone, 2-chlorobenzophenone, 4,4′-dichlorobenzophenone, 4,4′-bisdiethylaminobenzophenone, Michler's ketone, benzyl, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, methyl benzoylformate, p-isopropyl-α-hydroxyisobutylphenone, Carbonyl compounds such as α-hydroxyisobutylphenone, 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexyl phenyl ketone, tetramethylthiurammo Sulfide, tetramethylthiuram disulfide, thioxanthone, 2-chlorothioxanthone, and the like can be used sulfur compounds such as 2-methyl thioxanthone. These photopolymerization initiators may be used alone or in combination of two or more.

The thickness of the low refractive index layer is preferably in the range of 0.01 to 0.4 μm, and more preferably in the range of 0.02 to 0.2 μm.
(High refractive index layer)
The high refractive index layer is preferably a layer obtained by curing an active energy ray-curable resin layer containing metal oxide fine particles.

  Examples of the metal oxide fine particles include titanium oxide, zirconium oxide, zinc oxide, tin oxide, antimony oxide, cerium oxide, iron oxide, zinc antimonate, tin oxide-doped indium oxide (ITO), and antimony-doped tin oxide (ATO). , Aluminum-doped zinc oxide, gallium-doped zinc oxide, fluorine-doped tin oxide and the like. These metal oxide fine particles may be used alone or in combination.

  As the active energy ray-curable resin layer, the same materials as those described in the section of the low refractive index layer can be used.

The thickness of the high refractive index layer is preferably in the range of 0.05 to 10 μm, and more preferably in the range of 0.08 to 5 μm.
(Anti-glare layer)
The layer having an antiglare function (antiglare layer) prevents glare in the image, and a film having minute irregularities on the surface is preferably used. As the antiglare layer, for example, a thermosetting resin or a photocurable resin in which particles having an average particle diameter of about 1 to 10 μm are dispersed and applied to a support and cured, or a thermosetting resin Alternatively, a photo-curing resin is applied to the surface, a mold having a desired surface state is pressed to form unevenness, and then cured. The antiglare layer preferably has a haze value (JIS K 7136; 2000) of 0.5 to 20%. Further, the center line average roughness Ra value on the surface of the antiglare layer is preferably in the range of 100 to 1000 nm, particularly preferably in the range of 200 to 700 nm. Here, the center line average roughness Ra value can be measured using a surface roughness measuring instrument SE-3400 (manufactured by Kosaka Laboratory) based on the method of JIS B0601-1982.

The antiglare layer preferably has a hard coat function. The thickness of the antiglare layer is preferably in the range of 0.5 to 20 μm, more preferably in the range of 1 to 15 μm, and particularly preferably in the range of 1.5 to 12 μm.
(Hard coat layer)
A layer having a hard coat function (hard coat layer) is provided for preventing scratches. The hard coat layer preferably has a high hardness, and the pencil hardness defined by JIS K5600-5-4 (1999) is preferably H or higher, and more preferably 2H or higher. The upper limit is about 9H.

  The hard coat layer can be composed of an acrylic resin, urethane resin, melamine resin, epoxy resin, organic silicate compound, silicone resin, or the like. In particular, silicone resins and acrylic resins are preferable in terms of hardness and durability. Further, in terms of curability, flexibility, and productivity, those made of an active energy ray-curable acrylic resin or a thermosetting acrylic resin are preferable.

  The active energy ray-curable acrylic resin or thermosetting acrylic resin is a composition containing a polyfunctional acrylate, an acrylic oligomer, or a reactive diluent as a polymerization curing component. In addition, you may use what contains a photoinitiator, a photosensitizer, a thermal-polymerization initiator, a modifier, etc. as needed.

  Acrylic oligomers include polyester acrylates, urethane acrylates, epoxy acrylates, polyether acrylates, etc., including those in which a reactive acrylic group is bonded to an acrylic resin skeleton, and rigid materials such as melamine and isocyanuric acid. A material in which an acrylic group is bonded to a simple skeleton can also be used.

  In addition, the reactive diluent serves as a solvent for the coating process as a coating medium, and has a group that itself reacts with a monofunctional or polyfunctional acrylic oligomer. It becomes a polymerization component.

  Also, commercially available polyfunctional acrylic cured paints include Mitsubishi Rayon Co., Ltd. (trade name “Diabeam (registered trademark)” series, etc.), Nagase Sangyo Co., Ltd. (trade name “Denacol (registered trademark)”). Series, etc.), Shin-Nakamura Co., Ltd. (trade name “NK Ester” series, etc.), Dainippon Ink & Chemicals Co., Ltd .; (trade name “UNIDIC (registered trademark)” series, etc.), Toa Gosei Chemical Industry Co., Ltd .; (Product name "Aronix (registered trademark)" series, etc.), Nippon Oil & Fats Co., Ltd. (product name "Blenmer (registered trademark)" series, etc.), Nippon Kayaku Co., Ltd .; (product name "KAYARAD (registered trademark)" series, etc.) ), Kyoeisha Chemical Co., Ltd .; (Product name “Light Ester” series, “Light Acrylate” series, etc.) Can.

  When the typical thing of the acrylic compound which comprises a hard-coat layer formation composition is illustrated, it has 3 or more, More preferably 4 or more, More preferably 5 or more (meth) acryloyloxy group in 1 molecule An active energy ray comprising, as a main component, a mixture comprising at least one of a monomer and a prepolymer and at least one monomer having 1 to 2 ethylenically unsaturated double bonds in one molecule A hard coat layer obtained by curing or thermosetting is preferably used in that it is excellent in hardness, wear resistance and flexibility. If there are too many (meth) acryloyloxy groups, the monomer will be highly viscous and difficult to handle, and will have to be of high molecular weight, making it difficult to use as a coating solution. The number of (meth) acryloyloxy groups is preferably 10 or less.

  As the monomer and prepolymer having 3 or more (meth) acryloyloxy groups in one molecule, the hydroxyl group of the polyhydric alcohol having 3 or more alcoholic hydroxyl groups in one molecule is 3 or more. Examples include compounds that are esterified products of (meth) acrylic acid. Specific examples include pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, Dipentaerythritol hexa (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol triacrylate hexamethylene diisocyanate urethane prepolymer, pentaerythritol triacrylate toluene diisocyanate urethane prepolymer, pentaerythritol triacrylate isophorone diisocyanate urethane prepolymer, etc. Can be used. These monomers and prepolymers can be used alone or in combination of two or more. Of these, polyfunctional acrylate compounds having at least one hydroxyl group are particularly preferred because they can improve the adhesion between the hard coat layer and the adjacent layer when used in combination with the isocyanate described below.

  The use ratio of the monomer and prepolymer having 3 or more (meth) acryloyloxy groups in one molecule is preferably 20 to 90% by mass, more preferably based on the total amount of the hard coat layer forming composition. It is 30-80 mass%, Most preferably, it is 30-70 mass%.

  When the use ratio of the monomer and prepolymer having 3 or more (meth) acryloyloxy groups in one molecule is less than 20% by mass relative to the total amount of the hard coat layer forming composition, sufficient resistance In some cases, it is insufficient in terms of obtaining a hardened film having wear properties. Moreover, when the usage rate of the monomer and prepolymer having 3 or more (meth) acryloyloxy groups in one molecule exceeds 90% by mass with respect to the total amount of the hard coat layer forming composition, In some cases, the shrinkage is large, and the cured film remains distorted, the flexibility of the film is lowered, or the curled side is greatly curled.

  Of these, the proportion of the polyfunctional acrylate compound having at least one hydroxyl group is preferably 10 to 80% by mass, more preferably 20 to 70% by mass, and most preferably the total amount of the hard coat layer forming composition. Is 30 to 60% by mass. When the proportion of the polyfunctional acrylate compound having at least one hydroxyl group is less than 10% by mass with respect to the total amount of the hard coat layer forming composition, the effect of improving the adhesion between the hard coat layer and its adjacent layer is obtained. It may be small. When the use ratio of the polyfunctional acrylate compound having at least one hydroxyl group exceeds 80% by mass with respect to the total amount of the hard coat layer forming composition, the crosslink density in the hard coat layer is lowered, and the hardness of the hard coat layer Tends to decrease.

  Next, the monomer having 1 to 2 ethylenically unsaturated double bonds in one molecule can be used without particular limitation as long as it is a normal monomer having radical polymerizability.

  Moreover, as a compound which has two ethylenically unsaturated double bonds in a molecule | numerator, the following (a)-(f) (meth) acrylate etc. can be used.

(A) (meth) acrylic acid diesters of alkylene glycol having 2 to 12 carbon atoms: ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, Neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, etc .;
(B) (Meth) acrylate diesters of polyoxyalkylene glycol: diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, Polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, etc .;
(C) Polyhydric alcohol (meth) acrylic acid diesters: pentaerythritol di (meth) acrylate, etc .;
(D) (Meth) acrylic diesters of ethylene oxide and propylene oxide adducts of bisphenol A or bisphenol A hydride: 2,2′-bis (4-acryloxyethoxyphenyl) propane, 2,2′-bis ( 4-acryloxypropoxyphenyl) propane and the like;
(E) A terminal isocyanate group-containing compound obtained by reacting a diisocyanate compound with two or more alcoholic hydroxyl group-containing compounds in advance, and further reacting an alcoholic hydroxyl group-containing (meth) acrylate with two molecules in the molecule. Urethane (meth) acrylates having a (meth) acryloyloxy group, and the like;
(F) Epoxy (meth) acrylates having two (meth) acryloyloxy groups in the molecule obtained by reacting a compound having two or more epoxy groups in the molecule with acrylic acid or methacrylic acid.

  Compounds having one ethylenically unsaturated double bond in the molecule include methyl (meth) acrylate, ethyl (meth) acrylate, n- and i-propyl (meth) acrylate, n-, sec-, and t. -Butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, hydroxyethyl (meth) acrylate, polyethylene glycol Mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, glycidyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, N-hydroxyethyl (meth) acrylamide, N-vinylpyrrolidone N- vinyl-3-methylpyrrolidone, or the like can be used N- vinyl-5-methyl pyrrolidone. These monomers may be used alone or in combination of two or more.

  The use ratio of the monomer having 1 to 2 ethylenically unsaturated double bonds in one molecule is preferably 10 to 50% by mass, more preferably 20%, based on the total amount of the hard coat layer forming composition. -40 mass%. When the proportion of the monomer having 1 to 2 ethylenically unsaturated double bonds in one molecule exceeds 50% by mass with respect to the total amount of the hard coat layer forming composition, sufficient wear resistance is obtained. It may be difficult to obtain a cured film having a slag. In addition, when the use ratio of the monomer having 1 to 2 ethylenically unsaturated double bonds in one molecule is less than 10% by mass with respect to the total amount of the hard coat layer forming composition, the film can be used. The flexibility may decrease or the adhesiveness with the laminated film provided on the base film may decrease.

  In the present invention, as a method of curing the hard coat forming composition, for example, a method of irradiating ultraviolet rays as active energy rays, a high temperature heating method, or the like can be used. When using these methods, it is desirable to add a photopolymerization initiator or a thermal polymerization initiator to the hard coat layer forming composition.

  About a photoinitiator, the thing similar to what can be used for the above-mentioned low refractive index layer can be used. As the thermal polymerization initiator, a peroxide compound such as benzoyl peroxide or di-t-butyl peroxide can be used.

  The use amount of the photopolymerization initiator or thermal polymerization initiator is suitably 0.01 to 10% by mass with respect to 100% by mass of the total amount of the hard coat layer forming composition. When an electron beam or gamma ray is used as a curing means, it is not always necessary to add a polymerization initiator. In addition, when thermosetting at a high temperature of 220 ° C. or higher, it is not always necessary to add a thermal polymerization initiator.

  In the present invention, various additives can be further blended in the hard coat layer as required, as long as the effects of the present invention are not impaired. For example, stabilizers such as antioxidants, light stabilizers, ultraviolet absorbers, surfactants, leveling agents, antistatic agents, and the like can be used.

  Examples of active energy rays used in the present invention include electromagnetic waves that polymerize acrylic vinyl groups such as ultraviolet rays, electron beams, and radiation (α rays, β rays, γ rays, etc.). It is preferable. As the ultraviolet ray source, an ultraviolet fluorescent lamp, a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a xenon lamp, a carbon arc lamp, or the like can be used. Moreover, when irradiating actinic radiation, if it irradiates under a low oxygen concentration, it can harden | cure efficiently. Furthermore, the electron beam method is advantageous in that the apparatus is expensive and requires operation under an inert gas, but it is not necessary to include a photopolymerization initiator or a photosensitizer in the coating layer. is there.

  As the heat necessary for the thermosetting used in the present invention, steam heater, electric heater, infrared heater or far-infrared heater is used. The heat given by spraying on the base material and the coating film using is used. Among them, heat by air heated to 200 ° C. or higher is preferable, and heat by nitrogen heated to 200 ° C. or higher is more preferable. It is preferable because the curing rate is high.

  The thickness of the hard coat layer is preferably in the range of 0.5 to 20 μm, more preferably in the range of 1 to 15 μm, and particularly preferably in the range of 1.5 to 12 μm. When the thickness of the hard coat layer is less than 0.5 μm, even if it is sufficiently cured, it is too thin, so that the surface hardness is not sufficient and it tends to be easily scratched. On the other hand, when the thickness of the hard coat layer exceeds 20 μm, the cured film tends to be cracked due to stress such as bending.

  The hard coat layer can be given a function as a high refractive index layer constituting the antireflection layer described above. The high refractive index of the hard coat layer can be increased by adding the metal oxide fine particles described above to the resin composition for forming the hard coat layer or by using a resin containing molecules and atoms of high refractive index components. Figured.

  Examples of the molecules and atoms contained in the resin that improves the refractive index include halogen atoms other than F, S, N, and P atoms, aromatic rings, and the like.

(Anti-fouling layer)
The antifouling function (antifouling layer) prevents oily substances from adhering to the display filter when touched by a finger, and prevents dust and dirt in the atmosphere from adhering. Alternatively, it is a layer for facilitating removal even if these deposits adhere. As such an antifouling layer, for example, a fluorine coating agent, a silicone coating agent, a silicon / fluorine coating agent, or the like is used. The thickness of the antifouling layer is preferably in the range of 1 to 10 nm.
(Configuration of functional surface layer)
As described above, the functional surface layer of the present invention may be a single layer or a plurality of layers. As the functional surface layer having a plurality of structures, a) hard coat layer / high refractive index layer / low refractive index layer, b) high refractive index hard coat layer / low refractive index layer, c) hard coat layer / antiglare layer, d) Hard coat layer / antiglare antireflection layer, etc. are exemplified. In addition, in the structure of said a) -d), the layer as described on the right side is arrange | positioned at the visual recognition side.

  Moreover, when a functional surface layer is a single layer, it is preferable to have a plurality of functions. Examples of such a single layer are e) antireflection hard coat layer (single layer having antireflection function and hard coat function), f) antiglare hard coat layer (single layer having antiglare function and hard coat function) G) Antiglare antireflection hard coat layer (single layer having antiglare function, antireflection function and hard coat function) h) Antiglare antireflection layer (single layer having antiglare function and antireflection function) , Etc. are exemplified.

  The antifouling layer can be formed as a thin film (1 to 10 nm) on the surface of the above-described plural or single structure to such an extent that the function of these layers is not impaired.

  Coating methods for forming functional surface layers include dip coating, spin coating, slit die coating, gravure coating, reversal coating, rod coating, bar coating, spraying, and roll coating. For example, a known wet coating method can be used.

  As described above, the functional surface layer may be a single layer or a plurality of layers. The total thickness of the functional surface layer is preferably in the range of 1 to 20 μm, more preferably in the range of 2 to 15 μm, and particularly preferably in the range of 3 to 12 μm.

  When the total thickness of the functional surface layer is less than 1 μm, good coating properties may not be ensured when the functional surface layer is applied onto the conductive layer. When the conductive member is pasted through a gap of less than 2 mm, stable conduction between the conductive layer and the conductive member may not be ensured.

The total thickness of the functional surface layer is the distance from the surface of the conductive layer to the surface of the functional surface layer when the conductive layer is made of a metal thin film, and when the conductive layer is made of a conductive mesh, It is the distance from the base material to the surface of the functional surface layer at the center of gravity of the opening.
(Other functional layers composing display filters)
The display filter of the present invention preferably further includes a functional layer having at least one function selected from a near-infrared shielding function, a color tone adjustment function, or a visible light transmittance adjustment function.

  The near-infrared shielding function is preferably adjusted so that the maximum value of light transmittance in the wavelength range of 800 to 1100 nm is 15% or less. The near-infrared shielding function may be imparted by kneading and dispersing a near-infrared absorber on a base material, a functional surface layer, or an adhesive layer described later, or a near-infrared shielding layer may be newly provided. . The near-infrared shielding function can be imparted by using a near-infrared absorbing agent or by providing a layer that reflects near-infrared rays by metal free electrons such as a conductive thin film. In the present invention, a near-infrared shielding layer formed by applying and drying a paint in which a near-infrared absorber is dispersed or dissolved in a resin binder is used, or the functional surface layer or the adhesive layer contains the near-infrared absorber. The embodiment to be used is preferably used. Near-infrared absorbers include organic near-infrared absorbers such as phthalocyanine compounds, anthraquinone compounds, dithiol compounds, diimonium compounds, or titanium oxide, zinc oxide, indium oxide, tin oxide, zinc sulfide, cesium-containing oxides An inorganic near infrared absorber such as tungsten can be used.

  When the above-described near-infrared shielding layer is newly provided, it can be provided by coating on the base material between the base material and the conductive layer or on the opposite surface of the base material from the conductive layer.

  In the case where the near infrared shielding function is imparted to the viewer side from the base material, it is preferable to use an inorganic near infrared absorber having excellent light resistance.

The color tone adjustment function is a function for improving color purity and whiteness by absorbing light of a specific wavelength emitted from the display. In particular, it is preferable to shield orange light that reduces the color purity of red light emission, and it is preferable to contain a dye having an absorption maximum in the wavelength range of 580 to 620 nm (for example, a tetraazaporphyrin-based dye). Furthermore, it is preferable to contain a dye having an absorption maximum at a wavelength of 480 to 500 nm in order to improve whiteness.
For the color tone adjustment function, a layer containing a dye that absorbs light having the above-described wavelength may be newly provided, or a dye may be contained in the above-described near-infrared shielding layer, functional surface layer, or adhesive layer.

  The visible light transmittance adjusting function is a function for adjusting the visible light transmittance, and can be adjusted by containing a dye or a pigment. The visible light transmittance adjusting function may be imparted to the substrate, the near-infrared shielding layer, the functional surface layer, or the adhesive layer, or a transmittance adjusting layer may be newly provided.

  When a layer having the above-described color tone adjusting function and a layer having a visible light transmittance adjusting function are newly provided, these layers are provided between the base material and the conductive layer, or on the opposite side of the base material from the conductive layer. Can be provided.

  The display filter of the present invention is mounted on the image display panel directly or via a high-rigidity substrate having a thickness of about 1 to 5 mm (for example, a known high-rigidity substrate such as a glass plate, an acrylic plate, or a polycarbonate plate). Can do. Therefore, the display filter is preferably provided with an adhesive layer for being attached to the image display panel or the high-rigidity substrate. The display filter of the present invention is preferably attached directly to the image display panel via an adhesive layer.

  As described above, the adhesive layer can be provided with a near-infrared shielding function, a color tone adjusting function, or a visible light transmittance adjusting function. Moreover, it is a preferable aspect to provide the adhesive layer with an impact relaxation function for protecting the display from impact. In order to impart an impact relaxation function to the adhesive layer, the thickness of the adhesive layer is preferably 100 μm or more, and more preferably 300 μm or more. The upper limit thickness is preferably 3000 μm or less in consideration of the coating suitability of the adhesive layer.

  A well-known adhesive material or an adhesive material can be used for an adhesive layer. Examples of the adhesive material include acrylic, silicone, urethane, polyvinyl butyral, and ethylene-vinyl acetate. Adhesives include bisphenol A type epoxy resins, tetrahydroxyphenylmethane type epoxy resins, novolac type epoxy resins, resorcin type epoxy resins, polyolefin type epoxy resins and other epoxy resins, natural rubber, polyisoprene, poly-1, 2- (Di) enes such as butadiene, polyisobutene, polybutene, poly-2-heptyl-1,3-butadiene, poly-1,3-butadiene, polyoxyethylene, polyoxypropylene, polyvinyl ethyl ether, polyvinyl hexyl ether, etc. Polyesters such as polyethers, polyvinyl acetate, polyvinyl propionate, polyurethane, ethyl cellulose, polyvinyl chloride, polyacrylonitrile, polymethacrylonitrile, polysulfone, phenoxy resin Etc.

(Manufacturing method of display filter)
A method for producing a display filter according to the present invention will be described.

  In the method for producing a display filter of the present invention, at least a step (A) of obtaining a laminate having a base material, a conductive layer, and a functional surface layer in this order, in the non-image display region of the image display panel of the laminate. A step (B) of irradiating at least a part of the corresponding part with a laser from the functional surface layer side to reach the conductive layer from the functional surface layer and having a width of less than 2 mm; At least a step (C) of attaching the conductive member in any one of the above-mentioned a), b) and c) via the conductive adhesive layer of the conductive member.

  The step (A) for obtaining a laminate will be described.

  First, a conductive layer is formed on a substrate. The method for manufacturing the conductive layer is as described above. Next, a functional surface layer is formed by coating on the conductive layer. The structure of the functional surface layer is as described above.

  In the manufacturing process of the conductive layer, the conductive layer is preferably continuously formed on a roll-shaped long base having a length of about 30 to 3000 m. As for the formation of the functional surface layer, the functional surface layer is continuously formed on the conductive layer continuously formed on the long base material in the manufacturing process of the conductive layer. Is preferred.

  In the continuous production described above, the width of the base material and the conductive layer needs to be at least equal to or larger than the length of the short side of the single display filter. The width of the functional surface layer can be made smaller than the length on the short side of the display filter.

  As described above, when the conventional bare electrode is formed on the two opposite sides on the short side of the display filter, the coating width of the functional surface layer is made smaller than the length of the short side of the display filter. Adjusted to Similarly, in order to form a conventional bare electrode on the two opposite sides on the long side of the display filter, the coating width of the functional surface layer is adjusted to be smaller than the length of the long side of the display filter. Is done.

  In addition, the width of the base material, the conductive layer, and the functional surface layer can be widened so that two or more display filters can be taken in the width direction, thereby improving productivity. Also in this embodiment, the exposed electrode can be formed on the display filter by providing an uncoated portion of the functional surface layer at both ends in the width direction of the conductive layer. For example, in the case of two-sided chamfering, as shown in FIG. 4 described above, a bare electrode is formed on one side of the display filter by providing uncoated portions of the functional surface layer at both ends in the width direction of the conductive layer. be able to.

  In the present invention, the gap formed in the display filter is preferably provided on at least two opposing sides of at least four sides of the display filter, and in particular, the gap is preferably provided on all four sides of the display filter. . This is because the functional surface layer is also present outside the gap, and thus there is an advantage that the conductive layer is protected by the functional surface layer at the outer peripheral end of the display filter. Moreover, there exists an advantage that the adhesiveness of an electroconductive member improves because a functional surface layer exists in the circumference | surroundings of a space | gap.

In the step (A) of obtaining a laminate, after the functional surface layer is applied on the conductive layer, it is dried and cured as necessary to form the functional surface layer, and then the cover film is further functioned. It is preferable to laminate on the conductive surface layer. Lamination of the cover film is carried out in a series of production lines of coating, drying (including curing) and winding of the functional surface layer, and winding with the cover film laminated on the functional surface layer. It is done.

  Next, if necessary, a near-infrared shielding layer having both a near-infrared shielding function and a color tone adjustment function is coated on the surface opposite to the surface on which the conductive layer of the base material is formed. An adhesive layer is formed by coating. Moreover, it may replace with lamination | stacking of said near-infrared shielding layer and an adhesive layer, and may laminate | stack the adhesive layer which has a near-infrared shielding function and a color tone adjustment function.

  As described above, a long laminate for a display filter is manufactured.

  Next, a description will be given of the step (B) in which at least a part of the layered image display panel corresponding to the non-image display region is irradiated with a laser from the functional surface layer side to form the above-described specific void. To do. The gap is preferably formed by irradiating a laser as described above. The details of the method for forming the void by the laser are as described above.

  The voids may be formed in the state of a long laminate, or may be performed after the long laminate is cut and processed into a single display filter size. The formation of the gap is preferably performed in a state where the cover film is laminated. That is, it is preferable to form a void that reaches the conductive layer from the cover film surface and has a width of less than 2 mm by irradiating the laser from the surface of the cover film.

  In addition, when forming a space | gap in the state in which the cover film was laminated | stacked, it is preferable to form a cut line in the part corresponding to the boundary line of the image display area | region and non-image display area | region of a cover film.

  As described above, after the gap is formed in the display filter, the step (C) of attaching a conductive member to the gap via the conductive adhesive layer is performed.

  In the step (C), when the cover film is laminated, at least a portion of the cover film corresponding to the adhesive region of the conductive member is peeled off, and then the conductive member is placed in the gap via the conductive adhesive layer. It is preferable to stick. That is, the part corresponding to the non-image display area is peeled along the cut line of the cover film to expose the gap part, and the conductive member is attached to the gap.

  Moreover, in the manufacturing method of this invention, you may perform the formation process (B) of a space | gap, and the adhesion process (C) of an electroconductive member after mounting the above-mentioned laminated body to an image display panel. Moreover, a space | gap may be formed before mounting | wearing a display filter with an image display panel, and a conductive member may be stuck after mounting | wearing.

  In addition, the process of forming the score line on the cover film may be performed before or after the display filter is mounted on the image display panel, as described above.

  The manufacturing method of the display filter of the present invention has been described above. In the display filter of the present invention, the conductive member is attached to the gap in a state before being mounted on the image display panel and before the housing is assembled. It is important that the gap formation time and the conductive member sticking time are not particularly limited.

EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited by these Examples.
<Measurement method of thickness of conductive layer and total thickness of functional surface layer>
(1) Measuring method of conductive mesh thickness A sample cross section is cut out with a microtome, and the cross section is observed with an electrolytic emission scanning electron microscope (Hitachi S-800, acceleration voltage 15 kV, observation magnification 2500 times). Then, the thickness of the conductive mesh is measured. Arbitrary 10 locations are selected from one sample of 20 cm × 20 cm size, and the mesh thickness is measured by placing the conductive mesh portion in the microscope field of view, and the average value is taken as the thickness of the conductive mesh.

(2) Measurement of total thickness of functional surface layer A sample cross section was cut out with a microtome, and the cross section was cut with an electrolytic emission scanning electron microscope (Hitachi S-800, acceleration voltage 15 kV, observation magnification 2000 times). Observe and measure the total thickness of the functional surface layer. Arbitrary ten openings were selected from one 20 cm × 20 cm sample, and the distance from the base material to the functional surface layer at the center of gravity of the opening of the conductive mesh was averaged.
Example 1
<Production of long laminate>
A long laminate for a filter for display was produced in the following manner.

<Base material>
As a roll-like long base material, a roll-like PET film (Lumirror (registered trademark) manufactured by Toray Industries, Inc.) having a thickness of 100 μm, a width of 1000 mm, and a length of 100 m was used.

<Formation of conductive layer having conductive mesh>
A nickel layer (thickness: 0.02 μm) is formed on the entire surface excluding 10 mm each of both ends in the width direction on one side of the long base material, and a copper layer having a thickness of 2.5 μm is further formed thereon. Was formed by vacuum evaporation. Next, an alkali development type high-sensitivity positive resist film was laminated on the surface of this copper layer, exposed using a semiconductor laser having a wavelength of 405 nm, and developed using a developer containing 1% by mass of sodium carbonate. Next, after etching with a ferric chloride solution, the resist layer is peeled off by treatment with a 3% by mass aqueous sodium hydroxide solution, and a continuous mesh pattern having a line width of 10 μm, a line pitch of 250 μm, and a thickness of 2.5 μm. A conductive mesh made of was formed over 980 mm in the width direction of the long base material and 90 m in the longitudinal direction. Subsequently, the conductive mesh was blackened using an oxidation treatment agent (adjusted at a ratio of Enplate MB-438A / B / pure water = 8/13/79 manufactured by Meltex Co., Ltd.).
<Coating of functional surface layer>
The following hard coat layer, high refractive index layer, and low refractive index layer were sequentially coated on the conductive layer of the PET film on which the conductive layer was formed so as to cover almost the entire surface of the conductive layer. The coating width of these functional surface layers is 980 mm.

As a result of measurement, the total thickness of the functional surface layer was 8.1 μm.
<Coating formation of hard coat layer>
On the metal pattern layer of the conductive film, a commercially available hard coat agent (Opstar (registered trademark) Z7534 manufactured by JSR Corporation; solid content concentration 60 mass%) is methylethylketone so that the solid content concentration is 45 mass%. The hard coat layer coating solution prepared by dilution was applied with a micro gravure coater, dried at 100 ° C., and then cured by irradiation with ultraviolet rays of 1.0 J / cm ² to form a hard coat layer. When the hard coat layer was applied, the thickness after drying / curing was about 8 μm.
<Coating of high refractive index layer>
For the high refractive index layer prepared by diluting a commercially available high refractive index / antistatic coating material (Opster (registered trademark) TU4005 manufactured by JSR Corporation) to a solid content concentration of 8% on the hard coat layer. The coating liquid was applied with a micro gravure coater, dried at 100 ° C., and then cured by irradiation with ultraviolet light 1.0 J / cm ² to form a 1.65 high refractive index layer. When applying the high refractive index layer, the coating was applied so that the thickness after drying and curing was about 0.1 μm.
<Low refractive index layer>
Prepared by diluting commercially available paint for low refractive index layer (Opstar (registered trademark) TU2180, manufactured by JSR Corporation) with methyl isobutyl ketone so that the solid content concentration is 3% by mass on the above high refractive index layer. The low refractive index layer coating solution is applied with a micro gravure coater, dried at 100 ° C., and then cured by irradiation with ultraviolet light 1.0 J / cm ² to form a low refractive index layer having a refractive index of 1.37. Formed. In applying the low refractive index layer, the coating was performed so that the thickness after drying and curing was about 0.1 μm.
<Lamination of cover film>
Cover film (“E-MASK IP300” manufactured by Nitto Denko Corporation; 5 μm slightly adhesive layer is laminated on 38 μm PET film) so as to cover the entire surface of the low refractive index layer on the low refractive index layer The thin adhesive layer side was laminated with the low refractive index layer side. The width of the cover film is 980 mm.
<Lamination of near-infrared shielding layer>
A near-infrared shielding layer having an orange light shielding function on the surface opposite to the surface having the conductive layer with respect to the PET film substrate (a phthalocyanine dye and a diimonium dye as near-infrared absorbing dyes, and an orange light absorbing dye) And a layer obtained by coating a paint obtained by mixing a tetraazaporphyrin-based pigment with an acrylic resin so that the dry film thickness is 10 μm. The coating width of the near-infrared shielding layer is 980 mm.
<Lamination of adhesive layer>
A UV curable urethane acrylate resin (Hybon (registered trademark) manufactured by Hitachi Chemical Co., Ltd.) was applied on a separate film with a slit die coater to a thickness of 100 μm, and then applied using a UV irradiation device. Was then cured, and further a separate film was attached to obtain an adhesive layer sandwiched between the separate films. Next, the adhesive layer was laminated | stacked on the near-infrared shielding layer of the laminated body produced above, peeling one separate film. The width of the adhesive layer is 980 mm.

The structure of the long laminated body for display filters produced as described above is shown below.
<Configuration of long laminate>
Adhesive layer / near infrared shielding layer / PET film / conductive layer / functional surface layer (hard coat layer / high refractive index layer / low refractive index layer) / cover film.
<Preparation of display filter>
The long laminate produced as described above is cut into a sheet having a long side of 964 mm and a short side of 554 mm to cut out one display filter, and then this display filter is cut with a laser cutter (COMAX CO. ₂ laser cutter), and a continuous linear gap (reference numeral 4 in FIG. 1) was formed on the four sides of the display filter by irradiating the laser linearly 10 mm inside from each end. The laser was irradiated from the surface of the cover film, penetrating the cover film and the functional surface layer, and forming a gap reaching the conductive layer. The exposed portion of the conductive layer formed by this void was used as an electrode.

  The length of the gap formed as described above is 930 mm on the long side, 520 mm on the short side, and the width of the gap is 0.7 mm.

  Subsequently, in a state where the display filter is mounted on the laser cutter, all of the portions (reference numeral 5 in FIG. 1) corresponding to the boundary line between the image display region and the non-image display region (the long side is an end portion, respectively) The inner side of the cover film was irradiated with a laser along the inner side and the shorter side of the inner side was 21 mm from the end, respectively, to form a continuous line. The laser output was adjusted so that the score line penetrated only the plastic film part of the cover film.

Next, along the score line provided in the cover film, the cover film only in the non-image display area was peeled and removed, and the following conductive member was attached to the gap via the conductive adhesive layer. <Conductive member>
As the conductive member (a) of the present invention, a conductive member in which a conductive pressure-sensitive adhesive layer having a thickness of 25 μm was laminated on a cloth made of conductive fibers having a thickness of 50 μm was used. The width of this conductive member is 6 mm.
<Production of image display panel>
The display filter was bonded to the image display panel of the plasma display so that the adhesive layer of the display filter produced as described above was on the image display panel side.
<Assembly of plasma display>
When the front cover of the housing was assembled to the image display panel manufactured as described above, the front cover was assembled after the cover film in the image display area was peeled and removed.
(Example 2)
Example 1 was repeated except that the conductive member was changed to the following.
<Conductive member>
B) Conductive member having 10 through-holes (circular with a diameter of 0.7 mm) per cm ² and having a thickness of 3 μm of aluminum deposited on both sides of a 20 μm-thick PET film. A conductive member in which a conductive adhesive layer having a thickness of 25 μm was laminated on a plastic film was used. The width of this conductive member is 6 mm.
Example 3
Example 1 was repeated except that the conductive member was changed to the following.
<Conductive member>
As the conductive member of (c) of the present invention, a conductive member in which a 25 μm thick conductive adhesive layer was laminated on a 25 μm thick release PET film was used. The width of this conductive member is 6 mm.

However, when assembling the display, the release PET film of the conductive member was peeled off before assembling the entire cover of the housing.
(Comparative Example 1)
Example 1 was repeated except that the conductive member was changed to the following.
<Conductive member>
As a conventional conductive adhesive tape, an aluminum foil having a thickness of 50 μm and a conductive adhesive layer having a thickness of 25 μm laminated thereon was used. The width of this conductive member is 6 mm.
<Evaluation of electromagnetic shielding properties>
About the display produced in the Example and the comparative example, after standing for 30 days in the environment of temperature 25 degreeC and relative humidity 50%, the electromagnetic wave shielding property was evaluated in the following ways.

A Schwarzbeck antenna was installed in a 3 m method anechoic chamber manufactured by Riken, and radiated emissions with a frequency of 30 to 88 MHz radiated from the plasma display were measured using an EMI test receiver manufactured by Rohde & Schwarz and a spectrum analyzer manufactured by Agilent Technologies. In order to satisfy the FCC standard class B, the allowable value is 40 dB or less.
<Evaluation results>
Examples 1 to 3 of the present invention were all good at about 35 dB, but Comparative Example 1 exceeded 40 dB.

DESCRIPTION OF SYMBOLS 1 Base material 2 Conductive layer 3 Functional surface layer 4 Space | gap 5 Boundary of image display area and non-image display area 6 Bare electrode 11 Long conductive layer laminated base material in which conductive layer is formed on base material 12 Functional surface Uncoated part of layer 20 Conductive member of the present invention 21 Base material of conductive member 22 Conductive adhesive layer of conductive member 31 Image display panel 32 Front cover of casing 33 Gasket 34 External electrode 100 Display of the present invention Filter L gap width

Claims (6)

A display filter for mounting on a display image display panel,
The display filter has at least a substrate, a conductive layer, and a functional surface layer in this order,
At least part of the portion corresponding to the non-image display area of the image display panel has a gap that reaches the conductive layer from the functional surface layer and has a width of less than 2 mm,
A display filter, wherein the conductive member in any one of the following a), b), and c) is adhered to the gap through a conductive adhesive layer of the conductive member: .
B) A conductive member in which a conductive pressure-sensitive adhesive layer is laminated on a cloth made of conductive fibers.
B) A conductive member in which a conductive pressure-sensitive adhesive layer is laminated on a conductive plastic film having a metal plating on both sides of a plastic film having a plurality of through holes.
C) A conductive member having a conductive adhesive layer laminated on a release film.   The display filter according to claim 1, wherein the gap is provided in parallel and linearly with respect to at least two opposing sides of the four sides of the display filter.   The display-use filter according to claim 1, wherein the conductive member is attached so as to cover the entire space.   The functional surface layer is a functional layer having at least one function selected from an antireflection function, an antiglare function, a hard coat function, and an antifouling function, and is laminated directly on the conductive layer. The display filter according to claim 1, wherein A method of manufacturing a display filter for mounting on a display image display panel,
Step (A) of obtaining a laminate having at least a base material, a conductive layer, and a functional surface layer in this order,
At least a part of the laminated body corresponding to the non-image display area of the image display panel is irradiated with laser from the functional surface layer side, reaches the conductive layer from the functional surface layer, and has a width of less than 2 mm. A step (B) of forming a void;
It has at least a step (C) of adhering any of the conductive members in the following a), b) and c) through the conductive adhesive layer of the conductive member to the gap. A method for manufacturing a filter for display.
B) A conductive member in which a conductive pressure-sensitive adhesive layer is laminated on a cloth made of conductive fibers.
B) A conductive member in which a conductive pressure-sensitive adhesive layer is laminated on a conductive plastic film having a metal plating on both sides of a plastic film having a plurality of through holes.
C) A conductive member having a conductive adhesive layer laminated on a release film. The step (A) of obtaining the laminate includes a step of further laminating a cover film on the functional surface layer,
The step of forming the void (B) is a step of irradiating a laser from the surface of the cover film to reach the conductive layer from the cover film surface and forming a void having a width of less than 2 mm,
The display according to claim 5, wherein the step (C) of attaching is a step of attaching the conductive member to the gap after peeling off at least a portion of the cover film corresponding to the attachment region of the conductive member. Method for manufacturing filters.

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