JP2007234947A - Optical filter for display, display equipped therewith, and plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical filter with an electrode which has an excellent productivity. <P>SOLUTION: In the optical filter for a display 11; a conductive layer 13 and a hard coat layer are provided on one surface of a transparent film in this order, and a near infrared absorption layer is provided on the other surface. The transparent film and the conductive layer are mutually identical in a vertical and lateral length, and one of the vertical and lateral length is identical to the hard coat layer and the other length is longer. The transparent film and all layers are flush on both end surfaces in a direction in which all films and layers are identical in the vertical and lateral length, and the transparent film and the conductive layer 13 are laminated so that these protrude on both sides in a direction in which they are longer than the hard coat layer, the protrusion forms a first electrode, and further a second electrode is provided in the conductive layer 13 exposed to the flush end surface. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is applicable to various displays such as a plasma display panel (PDP), a cathode ray tube (CRT) display, a liquid crystal display, an organic EL (electroluminescent) display, and a field emission display (FED) including a surface electric field display (SED). The present invention relates to an optical filter having various functions such as antireflection, near-infrared shielding, electromagnetic wave shielding, and the like, and a display provided with this optical filter, particularly a PDP.

  In the case of flat panel displays such as liquid crystal displays, plasma displays (PDP), EL displays, and CRT displays, it has been known that the light from the outside is reflected on the surface and the internal visual information is difficult to see. Various measures have been taken, such as the installation of an optical film including an antireflection film.

  In recent years, large-screen displays have become mainstream in displays, and PDPs have become common as next-generation large-screen display devices. However, in this PDP, high-frequency pulse discharge is performed on the light emitting unit for image display, which may cause unnecessary electromagnetic radiation and infrared radiation that may cause malfunction of the infrared remote controller. Thus, various antireflection films for PDP (electromagnetic wave shielding light transmitting window material) having conductivity have been proposed. As the conductive layer of this electromagnetic wave shielding light transmitting window material, for example, (1) a transparent film provided with a transparent conductive thin film containing metallic silver, and (2) a conductive mesh made of a metal wire or conductive fiber in a net shape are provided. Transparent film, (3) a layer of copper foil or the like on the transparent film is etched into a net-like shape, an opening is provided, and (4) a conductive ink is printed on the transparent film in a mesh shape, etc. Are known.

  Furthermore, in a large display such as a conventional PDP, various films such as an antireflection film and a near infrared cut film are bonded together. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 11-74683) discloses an electromagnetic wave shielding light transmitting window material in which a conductive mesh is interposed between two transparent substrates and bonded and integrated with a transparent adhesive resin. Are listed.

  In the electromagnetic wave shielding light transmitting window material, it is necessary to ground (ground) a conductive layer (electromagnetic wave shielding material), for example, a conductive mesh, in order to improve the electromagnetic wave shielding property by the conductive layer. There is. For this purpose, an electromagnetic wave shielding material protrudes from between two transparent substrates and is grounded by wrapping around the back side of the light transmitting window material laminate, or is in contact with the electromagnetic wave shielding material between two transparent substrates. Thus, it is necessary to sandwich the conductive adhesive tape. However, in such a method, there is a problem that the above work in the stacking process is complicated.

  Patent Document 2 (Japanese Patent Laid-Open No. 2001-142406) discloses a laminate in which a single transparent substrate, an electromagnetic wave shielding material, an outermost antireflection film, and a near infrared cut film are laminated and integrated. An electromagnetic wave comprising a body, a conductive pressure-sensitive adhesive tape is attached across the edge and front and back edges of the transparent substrate, and the conductive pressure-sensitive adhesive tape and the edge of the electromagnetic shielding material are attached by a conductive pressure-sensitive adhesive A shielding light-transmitting laminated film is described.

Japanese Patent Laid-Open No. 11-74683 JP 2001-142406 A

  For example, when producing an optical filter for a display such as the above-mentioned PDP using a long plastic film, a near-infrared cut film and an antireflection film are produced, and these are laminated via a conductive mesh for electromagnetic wave shielding. Thus, a long optical filter is obtained, and then cut into a rectangular shape in accordance with the shape of the display portion on the entire surface of each display. For this reason, such a long optical filter is usually cut in the width direction, and the end faces of all layers are exposed on the cut surface in the width direction, that is, the end faces (side faces). There is only a very small area. The conductive mesh also has only a slight peek at the mesh-like cross section.

  If such an optical filter for display is used as it is and the conductive layer (for example, conductive mesh) can be grounded (grounded) to the PDP body in order to improve the electromagnetic wave shielding property by the conductive layer, it is extremely high. An optical filter for display that is easy to ground with productivity can be obtained.

  In the optical filter as described in Patent Document 2, it is necessary to bond the conductive adhesive tape across the end face of the filter and the edge (end part) of the front and back. At that time, the adhesive tape is twisted or broken. Work is complicated to prevent them, and a complicated process of attaching the conductive adhesive tape and the edge (end) of the electromagnetic shielding material with a conductive adhesive is required. There is a problem such as.

  Accordingly, an object of the present invention is to provide an optical filter for a display which can be easily manufactured, has a good electromagnetic shielding property, and has an earth electrode which can be easily attached to the display and can be easily grounded. .

  The present invention also provides an optical filter for a display which can be easily manufactured, has a grounding electrode which is light and thin, has a good electromagnetic wave shielding property, and is easy to attach to the display and to be easily grounded. With the goal.

  Furthermore, the present invention provides an optical filter suitable for a PDP that can be easily manufactured, has a good electromagnetic shielding property, and has a ground electrode that can be easily mounted on a display and is easily grounded. Objective.

  Another object of the present invention is to provide a display in which the optical filter having the above excellent characteristics is bonded to the surface of an image display glass plate.

  Furthermore, an object of the present invention is to provide a PDP in which the optical filter having the excellent characteristics is bonded to the surface of an image display glass plate.

Therefore, the present invention
An optical filter for display comprising at least one transparent film, and a conductive layer, a hard coat layer and a near infrared absorption layer provided thereon,
A conductive layer is provided on the transparent film, and a hard coat layer or a near-infrared absorbing layer is provided on the conductive layer, and the transparent film and the conductive layer are laminated so as to protrude on opposite sides, The protruding portion forms the first electrode portion,
Further, a second electrode portion is provided on the conductive layer exposed on the opposite end faces opposite to the opposite opposite sides, with no transparent film and conductive layer protruding, and the display optical filter (transparent film) The shape of the conductive layer, hard coat layer and near infrared absorption layer is preferably rectangular);
An optical filter for display comprising at least one transparent film, and a conductive layer, a hard coat layer and a near infrared absorption layer provided thereon,
The shape of the transparent film, conductive layer, hard coat layer and near infrared absorption layer is rectangular,
A conductive layer is provided on the transparent film, and a hard coat layer or a near-infrared absorbing layer is provided on the conductive layer.
The transparent film and the conductive layer have the same vertical and horizontal lengths, and the layers provided on the conductive layer have the same vertical and horizontal lengths, the other is longer, and are transparent. The film, the conductive layer, and the layer on the conductive layer are flush with each other in the longitudinal and lateral lengths in the same direction, and the transparent film and the conductive layer are elongated in the direction in which the transparent film and the conductive layer are elongated. The layers are stacked so as to protrude on both sides, and the protruding portion forms the first electrode portion,
An optical filter for display, wherein the second electrode portion is provided on the conductive layer exposed on the end face that is flush with the surface;
As a preferable aspect of the optical filter,
An optical filter for display comprising at least one transparent film, and a conductive layer, a hard coat layer and a near infrared absorption layer provided thereon,
The shape of the transparent film, conductive layer, hard coat layer and near infrared absorption layer is rectangular,
A conductive layer is provided on the transparent film, and a hard coat layer or a near-infrared absorbing layer is provided on the conductive layer.
The length and width of the transparent film and the conductive layer are the same as each other, and the length and width of the layer provided on the conductive layer are the same, and the other is elongated.
The layers other than the layer provided on the conductive layer are the same in length and width as the conductive layer, and the transparent film and all the layers are all the films in the length and width. Laminate so that both layers are flush with each other in the same direction and the layers other than the layer provided on the transparent film and the conductive layer protrude on both sides in the direction longer than the layer on the conductive layer. The projecting portion forms the first electrode portion,
Further, the second electrode portion is provided on the conductive layer exposed on the end face that is flush with the surface; and the conductive layer and the hard coat layer in this order on one surface of the transparent film; An optical filter for display provided with a near infrared absorption layer on the other surface,
The shape of the transparent film, conductive layer, hard coat layer and near infrared absorption layer is rectangular,
The length and width of the transparent film and the conductive layer are the same as each other, and the length of one of the length and width is the same as that of the hard coat layer, and the other is lengthened.
The near-infrared absorbing layer is the same in length and width as the conductive layer, and the transparent film and all layers have the same length and width in the direction in which all films and layers are the same. The transparent film and the conductive layer are laminated so that they protrude on both sides in a direction longer than the hard coat layer, and the protruding portion forms the first electrode portion.
Further, the second electrode portion is provided on the conductive layer exposed on the end face that is flush with the display; an optical filter for display; and a transparent film having a hard coat layer on one surface; Two transparent films with another transparent film provided with a conductive layer on the surface are bonded together with the back surface of the former transparent film and the conductive layer of the latter transparent film facing each other through the adhesive layer. An optical filter for display comprising
The conductive film and the transparent film having the conductive layer are laminated so as to protrude on opposite sides, and the protruding portion forms the first electrode portion,
Further, a second electrode portion is provided on the conductive layer exposed on the opposite end faces different from the opposite sides, on which the conductive layer and the transparent film having the conductive layer are not projected, and the display optical device A filter; and the optical filter according to the above preferred embodiment,
Two transparent films, a transparent film provided with a hard coat layer on one surface and another transparent film provided with a conductive layer on one surface, are the back surface of the former transparent film and the latter transparent film. In the state where the conductive layer is opposed to the adhesive layer through the adhesive layer, the optical filter for display is bonded,
The shape of the two transparent films, the hard coat layer and the conductive layer is rectangular, and the transparent film having the conductive layer has the same vertical and horizontal lengths, and one of the vertical and horizontal lengths is the hard coat layer. And the other is longer,
The transparent film having the hard coat layer has the same vertical and horizontal length as the hard coat layer, and
The two transparent films, the conductive layer and the hard coat layer were flush with each other in both the longitudinal and lateral lengths in the direction in which all the films and layers were the same, and the transparent film and the conductive layer were lengthened. Are laminated so that they protrude on both sides in the direction, the protrusions form the first electrode part,
An optical filter for display, wherein the second electrode portion is provided on the conductive layer exposed on the end face that is flush with the other;
It is in.

Preferred embodiments of the optical filter for display of the present invention are as follows.
(1) In an optical filter for display using two transparent films, it is preferable that a near-infrared absorbing layer is provided on the entire back surface of the transparent film having a hard coat layer. Moreover, it is also preferable that the near-infrared absorption layer is provided in the whole back surface of the transparent film which has a conductive layer.
(2) The second electrode portion is formed of a conductive material-containing adhesive. The installation of the ground electrode is particularly easy.
(3) The second electrode portion is formed of solder. Easy installation of ground electrode and excellent electromagnetic shielding.
(4) Long conductive so that a part of the rectangular surface of the hard coat layer or the uppermost layer provided on the hard coat layer protrudes into the end region of at least two opposite sides provided with the second electrode portion. A tape is provided, and at least a part of the protruding portion is bonded to the second electrode portion. Easy to ground. Mounting on the display becomes easy.
(5) In the above (4), the long conductive tape is parallel to the longitudinal direction of the tape in the end regions of the two opposing sides of the hard coat layer or the uppermost layer provided thereon. It is preferable that they are adhered.
(6) The conductive layer is a mesh-like conductive layer. Excellent electromagnetic shielding properties.
(7) A low refractive index layer is further formed on the hard coat layer. Good antireflection properties can be obtained.
(8) The near infrared absorbing layer has adhesiveness. A transparent adhesive layer becomes unnecessary. Mounting on the display becomes easy.
(9) A transparent adhesive layer is provided on the surface of the near-infrared absorbing layer opposite to the transparent film. Mounting on the display becomes easy.
(10) A hard coat layer is embedded in the mesh gap of the mesh-like conductive layer. Excellent transparency is obtained.
(11) The transparent film is a plastic film.
(12) A release sheet is provided on the transparent adhesive layer or the adhesive near-infrared absorbing layer. Mounting on the display becomes easy.
(13) A plasma display panel filter.

The display panel filter is
Form a conductive layer over the entire width of the surface of the long transparent film having a near-infrared absorbing layer on the back side, and then leave a band-like region at both ends of the conductive layer in a region narrower than that width on the conductive layer. By forming a hard coat layer, a laminated body having a conductive layer protruding on both sides as a first electrode part is formed, and a rectangular laminated body is produced by cutting in the width direction. Further, a cut surface of the rectangular laminated body A second electrode portion is provided on the conductive layer exposed at the end face; or a conductive layer is formed over the widthwise direction of the long transparent film, and then a band-like region is formed at both ends of the conductive layer. A conductive layer projecting on both sides as a first electrode part by forming a hard coat layer in a region narrower than its width on the conductive layer and then forming a near infrared absorbing layer on the back side of the long transparent film. Forming a laminate having layers Then, a rectangular laminate is produced by cutting in the width direction, and a second electrode portion is provided on the conductive layer exposed on the end surface which is the cut surface of the rectangular laminate;
Can be obtained more advantageously.

Furthermore, the present invention provides
A display characterized in that the optical filter for display is bonded to the surface of the image display glass plate; and a plasma characterized in that the optical filter for display is bonded to the surface of the image display glass plate It is also on the display panel.

  The optical filter for display of the present invention is an easily manufactured optical filter having a first electrode part (ground electrode) made of a conductive layer protruding on both sides, and a second electrode part (on the end face on the side without the first electrode part). The grounded electrode is an optical filter with a grounded electrode having excellent productivity. For example, an optical filter that is easy to manufacture can be obtained by cutting a long laminate obtained by forming a conductive layer, an antireflection layer, a near-infrared absorbing layer, and the like on a long plastic film. However, the first electrode portion is formed in advance in such a laminate (that is, an optical filter that is easy to manufacture) so that the conductive layer protrudes on both sides, and the second electrode portion can be easily formed on the cut surface. An optical filter with a grounding electrode provided with a simple grounding electrode has not been considered so far, and is achieved for the first time by the present invention. Therefore, the optical filter for display of the present invention can be said to be an optical filter with a ground electrode excellent in productivity, in which a ground electrode is further provided by a simple method on the optical filter with a conductive layer electrode that can be continuously manufactured. .

  In particular, when the above optical filter is obtained using a single transparent film, the thickness of the optical filter becomes extremely small, and the mass decreases accordingly. It is advantageous.

  Further, when a conductive tape is attached to the ground electrode (second electrode portion) having a cut surface and an electrode is provided around the optical filter, the grounding can be easily performed, and the mounting on the display is further facilitated. .

  Therefore, the optical filter for display of the present invention includes a field emission display (FED) including a plasma display panel (PDP), a cathode ray tube (CRT) display, a liquid crystal display, an organic EL (electroluminescence) display, and a surface electric field display (SED). It can be said that the optical filter has various functions such as anti-reflection, near-infrared shielding, and electromagnetic wave shielding for various displays such as).

  The optical filter for a display with an electrode part which is provided with the electrode part (earth electrode) of the present invention and is excellent in productivity will be described in detail below.

  FIG. 1 shows a plan view of an example showing the basic configuration of the optical filter for display of the present invention. In the rectangular display optical filter 11, an antireflection layer 17 such as a conductive layer 13, a hard coat layer 16 and a low refractive index layer is provided in this order on one surface of the transparent film 12, and close to the other surface. The infrared absorption layer 14 and the transparent adhesive layer 15 (refer FIG. 2 and 3) are provided on it. The antireflection layer 17 such as the hard coat layer 16 and the low refractive index layer is formed with a width narrower than the width of the conductive layer 13 formed to the full width of the transparent film surface. It protrudes more and forms the first electrode part. The near-infrared absorbing layer 14 is usually formed with the same width as the conductive layer 13. Furthermore, an electrode part (generally an earth electrode) 18 is provided as a second electrode part on the other opposite end faces (side faces) where the conductive layer 13 of this laminate does not protrude from both sides. In the present invention, an electrode portion is provided around the optical filter, and exhibits an excellent grounding effect.

  FIG. 2 is a schematic sectional view of the display optical filter of the present invention shown in FIG. 1 cut along the A-A ′ direction. FIG. 2 shows a cross-sectional view of a part of the rectangular display optical filter 11 including one end. In FIG. 2, an antireflection layer 17 such as a conductive layer 13, a hard coat layer 16 and a low refractive index layer is provided in this order on one surface of the transparent film 12, and a near infrared absorbing layer 14 and A transparent adhesive layer 15 is provided thereon. And the 2nd electrode part (generally earth electrode) 18 is formed in the end surface of this laminated body. The second electrode portion 18 needs to cover at least the conductive layer 13 exposed at the end face. As shown in FIG. 5 or FIG. 7 described later, when a conductive tape is used, the conductive tape is generally bonded to the upper portion of the second electrode portion 18. The first electrode portion is not shown here because it protrudes from the other end surface.

  FIG. 3 is a schematic sectional view of the display optical filter of the present invention shown in FIG. 1 cut along the B-B ′ direction. FIG. 3 is a cross-sectional view of a part of the rectangular display optical filter 11 including one end. In FIG. 3, an antireflection layer 17 such as a conductive layer 13, a hard coat layer 16, and a low refractive index layer is provided in this order on one surface of the transparent film 12, and a near infrared absorption layer 14 and A transparent adhesive layer 15 is provided thereon. The antireflection layer 17 such as the hard coat layer 16 and the low refractive index layer is formed with a width narrower than the width of the conductive layer 13 formed to the full width of the transparent film, so that the conductive layer 13 protrudes from both sides. And a first electrode portion (a portion having a length L) is formed. The near-infrared absorbing layer 14 is usually formed to the full width of the transparent film. Further, as shown in FIGS. 1 and 2, second electrode portions (generally earth electrodes) 18 are provided on the other opposing both end surfaces of the laminate in which the conductive layer 13 does not protrude from both sides. However, grounding can be performed more stably when the first electrode portion is the electrode contact portion.

  In this configuration, the positions of the antireflection layer 17 such as the hard coat layer 16 and the low refractive index layer, and the near infrared absorption layer 14 may be interchanged, and the near infrared absorption layer 14 is the conductive layer 13. And the hard coat layer 16 may be provided. However, the configuration of FIG. 3 is advantageous in that the grounding is easy to install because the conductive layer is present on the front surface (front side) of the display when the display is mounted.

  The conductive layer 13 is, for example, a mesh-like metal layer or metal-containing layer, a coating layer, a metal oxide layer (dielectric layer), or an alternately laminated film of metal oxide layers and metal layers. The mesh-like metal layer or metal-containing layer is generally formed by etching or printing, or is a metal fiber layer. This makes it easy to obtain low resistance. In general, the mesh gap of the mesh-like metal layer or metal-containing layer is filled with a hard coat layer 16 as shown in FIG. This improves transparency. When not filling with the hard-coat layer 16, it is preferable to fill with another layer, for example, the near-infrared absorption layer 14, or its own transparent resin layer.

  The antireflection layer 17 is generally a low refractive index layer. That is, the antireflection effect is exhibited by the composite film of the hard coat layer 16 and the low refractive index layer provided thereon. A high refractive index layer may be provided between the low refractive index layer and the hard coat layer 16. This improves the antireflection function.

  Further, the antireflection layer 17 may not be provided, and only the transparent film and the hard coat layer 16 having a refractive index higher or lower (preferably lower) than that of the transparent film may be used. The hard coat layer 16 and the antireflection layer 17 are preferably formed by coating from the viewpoints of productivity and economy.

  The near-infrared absorbing layer 14 has a function of blocking unnecessary light from the PDF. In general, it is a layer containing a dye having an absorption maximum at 800 to 1200 nm. The transparent adhesive layer 15 is generally provided for easy mounting on a display. A release sheet may be provided on the transparent adhesive layer 15.

The first electrode portion is a conductive layer protruding from one opposing end faces of the optical filter, and the protruding length (L _{1 in} FIG. 3) is generally 2 to 100 mm, particularly preferably 5 to 50 mm. The conductive layer is preferably a mesh metal layer.

The second electrode portion 18 is generally a ground electrode and covers at least the conductive layer 13 exposed at the end face, preferably a layer adjacent to the conductive layer. The entire end face of the filter may be covered. The width of the second electrode portion (L _{2 in} FIG. 2) is generally 5 μm or more, preferably 5 μm to 20 mm, in the width direction of the transparent film. If it is less than this range, it will be difficult to ground, and if it exceeds this range, it will hinder dimensional alignment. The length in the thickness direction of the film (d in FIG. 2) is generally 80 μm or more, and is set within the dimensional range of the structure of the optical filter for display. The second electrode portion 18 is generally formed of a conductive material-containing adhesive or solder containing a conductive material.

  FIG. 4 shows a schematic sectional view of an example of a preferred embodiment of the optical filter for display of the present invention shown in FIGS. FIG. 4 is a cross-sectional view of a part of the rectangular display optical filter 21 including one end portion (a cross-sectional view corresponding to FIG. 2). FIG. 4 corresponds to a view when the conductive layer of FIG. 2 is a mesh conductive layer. In FIG. 4, an antireflection layer 27 such as a mesh-like conductive layer 23, a hard coat layer 26, and a low refractive index layer is provided in this order on one surface of a transparent film 22, and near-infrared absorption is provided on the other surface. The layer 24 and the transparent adhesive layer 25 are provided thereon. And the 2nd electrode part (generally earth electrode) 28 is formed in the end surface of this laminated body. The second electrode portion 28 needs to cover at least the mesh-like conductive layer 23 exposed at the end face. In FIG. 4, since the mesh-like metal layer is used as the conductive layer, the electromagnetic wave shielding effect and the like are particularly excellent. The first electrode portion is not shown here because it protrudes from the other end faces of the mesh-like conductive layer. The mesh voids of the mesh-like metal layer are filled with the hard coat layer 26, thereby improving the transparency.

  FIG. 5 shows a schematic sectional view of an example of a preferred embodiment of the optical filter for display of the present invention. FIG. 5 shows the display optical filter 31 to which a conductive tape 39 is attached so as to be in contact with the second electrode portion 38 of the rectangular display optical filter. That is, in FIG. 5, an antireflection layer 37 such as a mesh-like conductive layer 33, a hard coat layer 36, and a low refractive index layer is provided in this order on one surface of the transparent film 32, and close to the other surface. An infrared absorbing layer 34 and a transparent pressure-sensitive adhesive layer 35 are provided thereon. And the 2nd electrode part (generally earth electrode) 38 is formed in the end surface of this laminated body. The second electrode portion 38 covers at least the mesh-like conductive layer 33 exposed at the end face. The conductive tape 39 is bonded to a part (upper part) of the second electrode part 38 on the end surface. Therefore, the conductive tape 39 is generally bonded by a conductive material-containing adhesive or solder itself that generally constitutes the second electrode portion. By using the conductive tape 39, not only the first electrode part but also the ground can be easily made and the ground can be stably taken. The conductive tape 39 preferably protrudes slightly from the end of the antireflection layer 37, but the form of the tape is not limited as long as it is in contact with a part of the electrode portion 38. However, it is preferable that a long conductive tape 39 is bonded to the end region of the antireflection layer 37 so that the sides and the longitudinal direction of the tape are parallel to each other.

  In order to adhere the conductive tape, the adhesive property of the upper part of the second electrode portion 38 is used. However, the conductive tape is made of double-sided tape made of aluminum or the like in the end region of the surface of the antireflection layer 37. May be adhered.

  The conductive tape 39 is provided in the end regions of the two opposite sides, but may be provided on all four sides. In FIG. 3, the long conductive tape 39 is provided on the antireflection layer 37, but is provided on the uppermost layer. Therefore, if the uppermost layer is a hard coat layer, it is provided thereon.

FIG. 6 is a plan view of the display optical filter 31 shown in FIG. 5 as viewed from the antireflection layer side. Up to the dotted line is the antireflection layer 37, that is, the laminate, and the conductive tape 39 almost covers the second electrode portion 38 on the antireflection layer 37, and all or part of the portion outside the dotted line is the end face. A part of the second electrode portion 38 is covered. The mesh-shaped conductive layer 33 protrudes and forms the first electrode portion. The width of the conductive tape 39 is generally 5 to 50 mm.
FIG. 7 shows a schematic cross-sectional view of an example of another embodiment of the optical filter for display according to the present invention.

  FIG. 7 shows the display optical filter 41 when two transparent films are used in the rectangular display optical filter of FIG. That is, in FIG. 7, an antireflection layer 47 such as a hard coat layer 46 and a low refractive index layer is provided in this order on the surface of the transparent film 42A, and a mesh-like conductive layer 43 is provided on the surface of another transparent film 42B. The near-infrared absorption layer 44 and the transparent adhesive layer 45 are provided on the back surface thereof, and the conductive film 43 of the transparent film 42B and the surface where the layer of the transparent film 42A is not provided It is bonded through the agent layer 50. And the 2nd electrode part (generally earth electrode) 48 is formed in the end surface of this laminated body. The second electrode portion 48 needs to cover at least the mesh-like conductive layer 43 exposed at the end face. And the electroconductive tape 49 is adhere | attached by a part of 2nd electrode part 48 on an end surface. By using this conductive tape 39, not only the first electrode part but also the ground can be taken very easily. In general, the mesh-like conductive layer 43 and the two transparent films protrude from the end portion in the direction where the second electrode portion 48 is not present. However, only the mesh-like conductive layer 43 or the mesh-like conductive layer 43 and the transparent film 42B provided with the mesh-like conductive layer 43 may protrude. The near-infrared absorbing layer 44 may be provided not on the back surface of the transparent film 42B but on the back surface of the transparent film 42A. At that time, the near-infrared absorbing layer 44 and the conductive layer 43 are bonded to each other so as to face the two films.

  The two transparent films are employed when it is advantageous in terms of production, but are disadvantageous in that they are bulky because the thickness is increased.

The optical filter for display is, for example,
Form a conductive layer over the entire width of the surface of the long transparent film having a near-infrared absorbing layer on the back side, and then leave a band-like region at both ends of the conductive layer in a region narrower than that width on the conductive layer. An area narrower than the width on the conductive layer so that the conductive layer is formed by forming a hard coat layer, or the widthwise fullness of the long transparent film, and then leaving a band-like area at both ends of the conductive layer. A hard coat layer is then formed, and then a near-infrared absorbing layer or the like is formed on the back side of the long transparent film (preferably in a region narrower than the width of the transparent film), thereby projecting on both sides as a first electrode portion Forming a laminate having a conductive layer;
Alternatively, a long plastic film on which a wide conductive layer is formed and a long antireflection film including a narrow hard coat layer and the like are laminated via an adhesive layer (formation of the first electrode portion). To obtain an elongated laminate,
Then, it produces by providing a 2nd electrode part in the laminated body film obtained by cutting the produced laminated body film into a rectangular shape according to the shape of the display part of the whole surface of each display. As described above, the end faces of all the layers are exposed on the end face which is the cut surface of such an optical filter, but it is naturally only an extremely small area. According to the present invention, it is possible to provide the second electrode portion (ground electrode) that can be easily attached to the ground and the display by using such a small exposed portion.

  In the case of a rectangular transparent film, each layer may be formed in a batch system. However, as described above, it is preferable to form each layer on a continuous film, in a roll-to-roll system, and to cut the layers.

  The material used for the optical filter for display of this invention is demonstrated below.

  The material of the transparent film is not particularly limited as long as it is transparent (meaning “transparent to visible light”), but a plastic film is generally used. For example, polyester {eg, polyethylene terephthalate (PET), polybutylene terephthalate}, polymethyl methacrylate (PMMA), acrylic resin, polycarbonate (PC), polystyrene, triacetate resin, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyethylene, Examples thereof include ethylene-vinyl acetate copolymer, polyvinyl butyral, metal ion crosslinked ethylene-methacrylic acid copolymer, polyurethane, cellophane and the like. Among these, polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), etc. are highly resistant to loads during processing (heat, solvent, bending, etc.) and particularly highly transparent. preferable. In particular, PET is preferable because it has excellent processability.

  The thickness of the transparent film varies depending on the use of the optical filter, but is generally 1 μm to 10 mm, 1 μm to 5 mm, and particularly preferably 25 to 250 μm.

  The conductive layer of the present invention is set so that the surface resistance value of the obtained optical filter is generally 10Ω / □ or less, preferably 0.001 to 5Ω / □, particularly 0.005 to 5Ω / □. Is done. A mesh-like conductive layer is also preferable. Alternatively, the conductive layer may be a coating layer or a layer obtained by a vapor deposition method (a transparent conductive thin film of metal oxide (ITO or the like)). Further, it may be an alternate laminate of a metal oxide dielectric film such as ITO and a metal layer such as Ag (eg, ITO / silver / ITO / silver / ITO laminate).

  As the mesh-like conductive layer, metal fibers and metal-coated organic fiber metals made into a mesh, copper foil on a transparent film etched into a mesh and provided with openings, conductive on the transparent film And the like, in which a conductive ink is printed in a mesh shape.

  In the case of a mesh-shaped conductive layer, the mesh preferably has a wire diameter of 1 μm to 1 mm and an aperture ratio of 40 to 95% made of metal fibers and / or metal-coated organic fibers. A more preferable wire diameter is 10 to 500 μm, and an aperture ratio is 50 to 95%. When the wire diameter exceeds 1 mm in the mesh-like conductive layer, the electromagnetic wave shielding property is improved, but the aperture ratio is lowered and cannot be made compatible. If it is less than 1 μm, the strength as a mesh is lowered and handling becomes difficult. Further, when the aperture ratio exceeds 95%, it is difficult to maintain the shape as a mesh. When the aperture ratio is less than 40%, the light transmittance is reduced, and the amount of light from the display is also reduced.

  The opening ratio of the conductive mesh refers to the area ratio occupied by the opening portion in the projected area of the conductive mesh.

  The metal fibers constituting the mesh-like conductive layer and the metal of the metal-coated organic fiber include copper, stainless steel, aluminum, nickel, titanium, tungsten, tin, lead, iron, silver, carbon or alloys thereof, preferably copper, Stainless steel and nickel are used.

  As the organic material for the metal-coated organic fiber, polyester, nylon, vinylidene chloride, aramid, vinylon, cellulose and the like are used.

  When a conductive foil such as a metal foil is subjected to pattern etching, copper, stainless steel, aluminum, nickel, iron, brass, or an alloy thereof, preferably copper, stainless steel, or aluminum is used as the metal of the metal foil.

  If the thickness of the metal foil is too thin, it is not preferable in terms of handleability and workability of pattern etching, and if it is too thick, it affects the thickness of the film obtained, and the time required for the etching process becomes long. The thickness is preferably about 1 to 200 μm.

  The shape of the etching pattern is not particularly limited, and examples thereof include a grid-like metal foil in which square holes are formed, and a punching metal-like metal foil in which circular, hexagonal, triangular or elliptical holes are formed. It is done. Further, the holes are not limited to those regularly arranged, and may be a random pattern. It is preferable that the area ratio of the opening part in the projection surface of this metal foil is 20 to 95%.

  Alternatively, the mesh-like conductive layer may be formed by pattern printing of conductive ink on a transparent substrate. Using the following conductive ink, it can be printed on the surface of the transparent substrate by screen printing, ink jet printing, electrostatic printing or the like.

  In general, carbon black particles having a particle size of 100 μm or less, or particles of a conductive material such as particles of metals or alloys such as copper, aluminum, nickel, etc. are bound to a binder of PMMA, polyvinyl acetate, epoxy resin or the like at a concentration of 50 to 90% by weight. Dispersed in resin. This ink is diluted or dispersed at a suitable concentration in a solvent such as toluene, xylene, methylene chloride, water, etc., applied to the surface of the transparent substrate by printing, and then dried at room temperature to 120 ° C. as necessary. Apply. Particles obtained by covering the same conductive material particles as described above with a binder resin are directly applied by electrostatic printing and fixed by heat or the like.

  The thickness of the printed film formed in this way is not preferable because the electromagnetic wave shielding property is insufficient if it is too thin, and if it is too thick, it affects the thickness of the resulting film, so it is about 0.5 to 100 μm. It is preferable to do this.

  According to such pattern printing, the degree of freedom of the pattern is large, and a conductive layer having an arbitrary wire diameter, interval and opening shape can be formed. Therefore, a plastic film having desired electromagnetic wave shielding properties and light transmission properties Can be easily formed.

  There is no particular limitation on the pattern printing shape of the conductive layer. For example, a grid-like printed film having a rectangular opening or a punching metal shape having a circular, hexagonal, triangular or elliptical opening. Examples include printed films. Further, the openings are not limited to those regularly arranged, and may be a random pattern. It is preferable that the area ratio of the opening part in the projection surface of this printed film is 20 to 95%.

  In addition to the above, as a mesh-like conductive layer, dots are formed on the film surface by a material soluble in a solvent, and a conductive material layer made of a conductive material insoluble in a solvent is formed on the film surface, A mesh-like conductive layer obtained by contacting the film surface with a solvent to remove the dots and the conductive material layer on the dots may be used.

  Examples of the conductive layer by coating include a coating layer in which conductive particles of an inorganic compound are dispersed in a polymer.

  Examples of the inorganic compound constituting the conductive particles include metals, alloys such as aluminum, nickel, indium, chromium, gold, vanadium, tin, cadmium, silver, platinum, copper, titanium, cobalt, lead; or ITO, oxidation Indium, tin oxide, zinc oxide, indium oxide-tin oxide (ITO, so-called indium-doped tin oxide), tin oxide-antimony oxide (ATO, so-called antimony-doped tin oxide), zinc oxide-aluminum oxide (ZAO; so-called aluminum-doped oxide) And conductive oxides such as zinc). In particular, ITO is preferable. The average particle size is preferably 10 to 10,000 nm, particularly preferably 10 to 50 nm.

  Examples of the polymer include acrylic resin, polyester resin, epoxy resin, urethane resin, phenol resin, maleic acid resin, melamine resin, urea resin, polyimide resin, and silicon-containing resin. Furthermore, it is preferable that it is a thermosetting resin among these resins.

  Alternatively, the polymer is particularly preferably an ultraviolet curable resin used for a hard coat layer described later.

  The conductive layer is formed by coating by dispersing the conductive fine particles in a polymer (using a solvent if necessary) by mixing or the like to prepare a coating solution, and coating the coating solution on a transparent substrate. And then drying and curing as appropriate. In the case of using a thermoplastic resin, it is obtained by drying after coating, and in the case of a thermosetting type, it is obtained by drying and thermosetting. When an ultraviolet curable resin is used, it can be obtained by drying after application and irradiating with ultraviolet rays after coating.

  The thickness of the conductive layer formed by coating is preferably 0.01 to 5 μm, particularly preferably 0.05 to 3 μm. When the thickness is less than 0.01 μm, the electromagnetic wave shielding property may not be sufficient. On the other hand, when the thickness exceeds 5 μm, the transparency of the resulting film may be lowered.

  The conductive layer of the present invention is also preferably a conductive polymer layer formed by coating. For example, hydrocarbon polymers such as polyacetylene, polyphenylene, polyphenylene vinylene, polyacene, polyphenylacetylene, polynaphthalene; heteroatom-containing polymers such as polypyrrole, polyaniline, polythiophene, polyethylene vinylene, polyazulene, polyisothianaphthene . Polypyrrole and polythiophene are preferred. The thickness of the light conductive layer of the conductive polymer is preferably 0.01 to 5 μm, particularly preferably 0.05 to 3 μm. When the thickness is less than 0.01 μm, the electromagnetic wave shielding property may not be sufficient. On the other hand, when the thickness exceeds 5 μm, the transparency of the resulting film may be lowered.

  When the conductive layer is formed by a vapor deposition method (metal oxide layer), the formation method is not particularly limited, but a vapor phase such as sputtering, ion plating, electron beam vapor deposition, vacuum vapor deposition, chemical vapor deposition, etc. Examples of the method include a film forming method, printing, and coating, but a gas phase film forming method (sputtering, ion plating, electron beam vapor deposition, vacuum vapor deposition, chemical vapor deposition) is preferable. A conductive layer can be formed using the inorganic compound. When the conductive layer is formed by a vapor deposition method, the layer thickness is preferably 30 to 50000 nm, particularly about 50 nm.

  A metal plating layer may be further provided on the conductive layer in order to improve conductivity. The metal plating layer can be formed by a known electrolytic plating method or electroless plating method. As the metal used for plating, generally, copper, copper alloy, nickel, aluminum, silver, gold, zinc, tin or the like can be used, preferably copper, copper alloy, silver, or nickel, In particular, it is preferable to use copper or a copper alloy from the viewpoint of economy and conductivity.

  Further, the conductive layer may be an alternately laminated film of a dielectric layer (metal oxide) and a metal layer. In particular, a laminate of 5 layers or more of dielectric layer / metal layer / dielectric layer / metal layer / dielectric layer is preferable. For example, an alternate laminate of a dielectric layer of a metal oxide such as ITO and a metal layer of Ag or the like (eg, a laminate of ITO / silver / ITO / silver / ITO) can be used.

  The transparent conductive film can be formed by physical vapor deposition or chemical vapor deposition. Examples of the physical vapor deposition method include a vacuum vapor deposition method, a sputtering method, an ion plating method, and a laser ablation method, but it is generally preferable to form a film by the sputtering method. Examples of the chemical vapor deposition method include an atmospheric pressure CVD method, a low pressure CVD method, and a plasma CVD method.

  In order to improve the electromagnetic wave shielding effect by further reducing the resistance value of the conductive layer (particularly the mesh-shaped conductive layer), it is preferable to form a plating layer on the conductive layer.

  Examples of materials used for the plating process include copper, nickel, chromium, zinc, tin, silver, and gold. These may be used alone or as two or more kinds of alloys. The plating process is generally performed by ordinary liquid phase plating (electroplating, electroless plating, etc.).

  Moreover, you may give anti-glare performance. When this anti-glare treatment is performed, a blackening treatment may be performed on the surface of the (mesh) conductive layer. For example, oxidation treatment of a metal film, black plating such as chromium alloy, application of black or dark ink, and the like can be performed.

  The antireflection layer of the present invention is generally a composite film of a hard coat layer having a refractive index lower than that of a transparent film as a substrate and a low refractive index layer provided thereon, or a hard coat layer and a low refractive index layer. Is a composite film in which a high refractive index layer is further provided therebetween. The antireflection film is effective even if it is only a hard coat layer having a refractive index lower than that of the substrate. However, when the refractive index of the substrate is low, a composite film of a hard coat layer having a higher refractive index than the transparent film and a low refractive index layer provided thereon, or a higher refractive index layer is provided on the low refractive index layer. A composite film obtained may be used.

  As a hard-coat layer, an acrylic resin layer, an epoxy resin layer, a urethane resin layer, a silicone resin layer, etc. can be mentioned, The thickness is 1-50 micrometers normally, Preferably it is 1-10 micrometers. Either a thermosetting resin or an ultraviolet curable resin may be used, but an ultraviolet curable resin is preferable.

  Examples of the thermosetting resin include phenol resin, resorcinol resin, urea resin, melamine resin, epoxy resin, acrylic resin, urethane resin, furan resin, and silicon resin.

  Examples of the ultraviolet curable resin (monomer, oligomer) include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and 2-ethylhexyl polyethoxy (meth) acrylate. , Benzyl (meth) acrylate, isobornyl (meth) acrylate, phenyloxyethyl (meth) acrylate, tricyclodecane mono (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, acryloylmorpholine , N-vinylcaprolactam, 2-hydroxy-3-phenyloxypropyl (meth) acrylate, o-phenylphenyloxyethyl (meth) acrylate, neopentylglyce Di (meth) acrylate, neopentyl glycol dipropoxy di (meth) acrylate, neopentyl glycol di (meth) acrylate hydroxypivalate, tricyclodecane dimethylol di (meth) acrylate, 1,6-hexanediol di (meth) Acrylate, nonanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, tris [(meth) acryloxyethyl] isocyanurate, ditrimethylolpropane (Meth) acrylate monomers such as tetra (meth) acrylate; polyol compounds (for example, ethylene glycol, propylene glycol, neopentyl glycol, , 6-hexanediol, 3-methyl-1,5-pentanediol, 1,9-nonanediol, 2-ethyl-2-butyl-1,3-propanediol, trimethylolpropane, diethylene glycol, dipropylene glycol, polypropylene Polyols such as glycol, 1,4-dimethylolcyclohexane, bisphenol A polyethoxydiol, polytetramethylene glycol, the polyols and succinic acid, maleic acid, itaconic acid, adipic acid, hydrogenated dimer acid, phthalic acid, isophthalic acid Polyester polyols which are reaction products of polybasic acids such as acid and terephthalic acid or acid anhydrides thereof, polycaprolactone polyols which are reaction products of the polyols and ε-caprolactone, the polyols and the above, Polybasic acid or this Reaction products of these acid anhydrides with ε-caprolactone, polycarbonate polyols, polymer polyols, etc.) and organic polyisocyanates (for example, tolylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, diphenylmethane-4,4′-diisocyanate, diisocyanate) Cyclopentanyl diisocyanate, hexamethylene diisocyanate, 2,4,4′-trimethylhexamethylene diisocyanate, 2,2′-4-trimethylhexamethylene diisocyanate, etc.) and a hydroxyl group-containing (meth) acrylate (for example, 2-hydroxyethyl (meta ) Acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenyloxypropyl (meth) acrylic Rate, cyclohexane-1,4-dimethylol mono (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, glycerin di (meth) acrylate, etc.) (Meth) such as bisphenol type epoxy (meth) acrylate, which is a reaction product of bisphenol type epoxy resin such as polyurethane (meth) acrylate, bisphenol A type epoxy resin, bisphenol F type epoxy resin and (meth) acrylic acid which is a reaction product Examples include acrylate oligomers. These compounds can be used alone or in combination. These ultraviolet curable resins may be used as a thermosetting resin together with a thermal polymerization initiator.

  For the hard coat layer, among the above-mentioned ultraviolet curable resins (monomers and oligomers), hard materials such as pentaerythritol tri (meth) acrylate, pentaerythritol penta (meth) acrylate and dipentaerythritol hexa (meth) acrylate are used. It is preferable to mainly use polyfunctional monomers.

  Any compound suitable for the properties of the ultraviolet curable resin can be used as the photopolymerization initiator for the ultraviolet curable resin. For example, acetophenone such as 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1 Benzoin series such as benzyldimethyl ketal, benzophenone, 4-phenylbenzophenone, benzophenone series such as hydroxybenzophenone, thioxanthone series such as isopropylthioxanthone, 2-4-diethylthioxanthone, and other special ones include methylphenyl glyoxylate Etc. can be used. Particularly preferably, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1, Examples include benzophenone. These photopolymerization initiators may be optionally selected from one or more known photopolymerization accelerators such as benzoic acid type or tertiary amine type such as 4-dimethylaminobenzoic acid. It can be used by mixing at a ratio. Moreover, it can be used by 1 type, or 2 or more types of mixture of only a photoinitiator. Particularly preferred is 1-hydroxycyclohexyl phenyl ketone (Irgacure 184, manufactured by Ciba Specialty Chemicals).

  The quantity of a photoinitiator is 0.1-10 mass% with respect to a resin composition, Preferably it is 0.1-5 mass%.

  The hard coat layer preferably has a refractive index lower than that of the transparent film. By using the ultraviolet curable resin, a refractive index lower than that of the substrate is generally easily obtained. Therefore, it is preferable to use a material having a high refractive index such as PET as the transparent substrate. Therefore, the hard coat layer preferably has a refractive index of 1.60 or less. The film thickness is as described above.

The high refractive index layer is made of ITO, ATO, Sb ₂ O ₅ , Sb ₂ O ₃ , SbO ₂ , In ₂ O ₃ , SnO ₂ , ZnO, ZrO ₂ , Al in a polymer (preferably UV curable resin). A layer in which conductive metal oxide fine particles (inorganic compounds) such as doped ZnO and TiO ₂ are dispersed is preferable. The metal oxide fine particles preferably have an average particle size of 10 to 10,000 nm, preferably 10 to 50 nm. In particular, ITO (especially having an average particle diameter of 10 to 50 nm) is preferable. Those having a refractive index of 1.64 or more are suitable. The film thickness is generally in the range of 10 to 500 nm, preferably 20 to 200 nm.

  When the high refractive index layer is a conductive layer, the minimum reflectance of the surface reflectance of the antireflection film is set within 1.5% by setting the refractive index of the high refractive index layer 2 to 1.64 or more. The minimum reflectance of the surface reflectance of the antireflection film can be made to be within 1.0% by setting it to 1.69 or more, preferably 1.69 to 1.82.

  The low refractive index layer is a layer (cured) in which fine particles such as silica and fluororesin, preferably hollow silica, are dispersed in a polymer (preferably UV curable resin) in an amount of 10 to 60% by weight (preferably 10 to 50% by weight). Layer). The refractive index of this low refractive index layer is preferably 1.40 to 1.51. When the refractive index is more than 1.51, the antireflection property of the antireflection film is deteriorated. The film thickness is generally in the range of 10 to 500 nm, preferably 20 to 200 nm.

  As the hollow silica, those having an average particle diameter of 10 to 100 nm, preferably 10 to 50 nm, and a specific gravity of 0.5 to 1.0, preferably 0.8 to 0.9 are preferable.

  The hard coat layer preferably has a visible light transmittance of 85% or more. Both the visible light transmittance of the high refractive index layer and the low refractive index layer are preferably 85% or more.

  When the antireflection layer is composed of the above three layers, for example, the thickness of the hard coat layer is 2 to 20 μm, the thickness of the high refractive index layer is 75 to 200 nm, and the thickness of the low refractive index layer is 75 to 200 nm. Preferably there is.

  In order to form each layer of the antireflection layer, as described above, the polymer (preferably UV curable resin) is blended with the fine particles as necessary, and the obtained coating solution is applied, and then dried. If necessary, it is heat-cured, or after coating, if necessary, it is dried and irradiated with ultraviolet rays. In this case, each layer may be applied and cured one by one, or all the layers may be applied and then cured together.

  As a specific method of coating, a method of coating a coating solution in which an ultraviolet curable resin containing an acrylic monomer or the like is made into a solution with a solvent such as toluene is coated with a gravure coater, and then dried, and then cured by ultraviolet rays. Can be mentioned. This wet coating method has the advantage that the film can be uniformly formed at high speed at low cost. After this coating, for example, by irradiating and curing with ultraviolet rays, the effect of improving the adhesion and increasing the hardness of the film can be obtained. The conductive layer can be formed similarly.

  In the case of ultraviolet curing, many light sources that emit light in the ultraviolet to visible range can be used as the light source, such as ultra-high pressure, high pressure, low pressure mercury lamp, chemical lamp, xenon lamp, halogen lamp, mercury lamp, carbon arc lamp, incandescent lamp. And laser light. The irradiation time cannot be determined unconditionally depending on the type of lamp and the intensity of the light source, but is about several seconds to several minutes. Moreover, in order to accelerate curing, the laminate may be preheated to 40 to 120 ° C. and irradiated with ultraviolet rays.

  The antireflection layer of the present invention is preferably formed by coating as described above, but may be formed by a vapor phase film forming method. Usually, the high refractive index layer and the low refractive index layer can be formed by physical vapor deposition or chemical vapor deposition. Examples of the physical vapor deposition method include a vacuum vapor deposition method, a sputtering method, an ion plating method, and a laser ablation method, but it is generally preferable to form a film by the sputtering method. Examples of the chemical vapor deposition method include an atmospheric pressure CVD method, a low pressure CVD method, and a plasma CVD method.

  Examples of the combination of the high refractive index layer and the low refractive index layer include the following.

(A) 1 layer each in the order of high refractive index layer / low refractive index layer, laminated in a total of 2 layers, (b) 2 layers of high refractive index layer / low refractive index layer alternately, 4 layers in total (C) One layer each in the order of medium refractive index layer / high refractive index layer / low refractive index layer, laminated in a total of three layers, (d) high refractive index layer / low refractive index layer In this order, each layer is alternately stacked in 3 layers for a total of 6 layers. As the high refractive index layer, ITO (tin indium oxide) or ZnO, a thin film of ZnO, TiO ₂ , SnO ₂ , ZrO or the like doped with Al can be employed. As the low refractive index layer, a thin film having a refractive index of 1.6 or less, such as SiO ₂ , MgF ₂ , Al ₂ O _3, or the like can be used.

  The high refractive index layer, the low refractive index layer, and the like can be formed by physical vapor deposition or chemical vapor deposition. Examples of the physical vapor deposition method include a vacuum vapor deposition method, a sputtering method, an ion plating method, and a laser ablation method, but it is generally preferable to form a film by the sputtering method. Examples of the chemical vapor deposition method include an atmospheric pressure CVD method, a low pressure CVD method, and a plasma CVD method.

  A near-infrared absorption layer is generally obtained by forming a layer containing a pigment or the like on the surface of a transparent film. The near-infrared absorbing layer can be obtained, for example, by applying a coating solution containing an ultraviolet curable or electron beam curable resin containing the pigment and the binder resin, and drying and curing if necessary. When used as a film, it is generally a near-infrared cut film, such as a film containing a pigment or the like. The dye generally has an absorption maximum at a wavelength of 800 to 1200 nm. Examples include phthalocyanine dyes, metal complex dyes, nickel dithiolene complex dyes, cyanine dyes, squarylium dyes, polymethine dyes, Examples thereof include azomethine dyes, azo dyes, polyazo dyes, diimonium dyes, aminium dyes, and anthraquinone dyes, and cyanine dyes and squarylium dyes are particularly preferable. These dyes can be used alone or in combination. Examples of the binder resin include thermoplastic resins such as acrylic resins.

  In the present invention, the near-infrared absorbing layer may be provided with a function of adjusting color tone by providing a function of absorbing neon light emission. For this purpose, a neon-emission absorption layer may be provided, but a neon-emission selective absorption dye may be included in the near-infrared absorption layer.

  Neon luminescent selective absorption dyes include cyanine dyes, squarylium dyes, anthraquinone dyes, phthalocyanine dyes, polymethine dyes, polyazo dyes, azurenium dyes, diphenylmethane dyes, and triphenylmethane dyes. it can. Such a selective absorption dye is required to have a selective absorption of neon emission near 585 nm and a small absorption at other visible light wavelengths, so that the absorption maximum wavelength is 575 to 595 nm and the absorption spectrum half width is What is 40 nm or less is preferable.

  Also, when combining multiple types of near-infrared or neon luminescent absorbing dyes, if there is a problem with the solubility of the dye, if there is a reaction between the dyes due to mixing, if there is a decline in heat resistance, moisture resistance, etc. All the near-infrared absorbing dyes need not be contained in the same layer, and may be contained in another layer.

  Further, as long as the optical properties are not greatly affected, coloring pigments, ultraviolet absorbers, antioxidants and the like may be further added.

  As a near-infrared absorption characteristic of the optical filter of the present invention, it is preferable that the transmittance at 850 to 1000 nm is 20% or less, and further 15%. Moreover, as selective absorptivity, it is preferable that the transmittance | permeability of 585 nm is 50% or less. Especially in the former case, there is an effect of reducing the transmittance in a wavelength region where malfunction of a remote controller of a peripheral device is pointed out. In the latter case, an orange color having a peak at 575 to 595 nm is color reproducibility. This has the effect of absorbing the orange wavelength, thereby improving the redness and improving the color reproducibility.

  The layer thickness of the near infrared absorbing layer is generally 0.5 to 50 μm.

  The second electrode portion of the present invention is formed from a conductive material-containing adhesive or solder.

  The conductive material-containing adhesive (conductive adhesive) is obtained by dispersing metal powder of copper, silver, nickel or the like (preferably silver or silver-copper alloy) in a synthetic resin (and an appropriate organic solvent). . The average particle size of the metal powder is generally 0.001 to 100 μm, in particular 0.01 to 50 μm. As the synthetic resin, an acrylic resin, a polyester resin, an epoxy resin, and an acrylic urethane resin are preferable, and an acrylic resin and a polyester resin are particularly preferable. The synthetic resin may be thermoplastic or thermosetting. The ratio of the metal powder to the total solid content is preferably in the range of 10 to 95% by mass, particularly 30 to 90% by mass.

The electrode part is formed with the conductive material-containing adhesive. The electrode part forming coating includes a synthetic resin in which metal powder is dispersed on the end face of the transparent film having the conductive layer, the hard coat layer, the near-infrared absorbing layer, etc. of the present invention. It is obtained by coating (applying) the working liquid and drying and / or curing at room temperature to 150 ° C. for 5 minutes to 5 hours. The thickness (width direction of the transparent film) of the obtained second electrode part is generally 5 to 500 μm, and particularly preferably 10 to 200 μm. The conductivity of the obtained electrode part is preferably in the range of 1 × 10 ⁻⁶ to 1 × 10 ⁻² Ω · cm.

  Examples of commercially available electrode part-forming coating solutions include Doutite XA-9015, Doutite XE-9000, Doutite FE107, Doutite FN-101 (manufactured by Fujikura Kasei Co., Ltd.), ECM-100, VI7901 (and above). Solar Ink Co., Ltd.), DW-114L-1, DW-250H-5 (Toyobo Co., Ltd.).

The solder is generally composed of Sn and Pb, and Pb-free solder, for example, Sn-Ag, Sn-Cu, Sn-Bi, Sn-Ag-Cu, Sn-Ag-Bi, Sn-Ag. -Cu-Bi system, Sn-Zn-Bi system, etc. can be used. In the present invention, Pb-free solder is preferable. Those having a melting point of 190 to 250 ° C are preferred. Soldering can be performed using methods such as flow soldering, reflow soldering, and hand soldering. The thickness of the electrode part of the obtained solder is generally 5 to 500 μm, and particularly preferably 10 to 200 μm. The conductivity of the obtained electrode part is preferably in the range of 1 × 10 ⁻⁶ to 1 × 10 ⁻² Ω · cm.

  The conductive tape is generally a metal foil, and for example, a foil of copper, silver, nickel, aluminum, stainless steel or the like can be used, and the thickness is usually 1 to 100 μm. The thickness of this conductive tape is usually 5 to 100 μm.

  The transparent adhesive layer of the present invention is a layer for adhering the optical film of the present invention to a display, and any resin can be used as long as it has an adhesive function. For example, acrylic adhesives, rubber adhesives, SEBS (styrene / ethylene / butylene / styrene) and SBS (styrene / butadiene / styrene) and other thermoplastic elastomers (TPE) as main components TPE-based pressure-sensitive adhesives and adhesives can also be used.

  The layer thickness is generally in the range of 5 to 500 μm, particularly 10 to 100 μm. In general, the optical filter can be equipped by heat-pressing the pressure-sensitive adhesive layer to a glass plate of a display.

  When two transparent films are used in the present invention, for example, ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, acrylic resin (eg, ethylene- (meth) acrylic acid copolymer) Polymer, ethylene- (meth) ethyl acrylate copolymer, ethylene- (meth) methyl acrylate copolymer, metal ion crosslinked ethylene- (meth) acrylic acid copolymer), partially saponified ethylene-vinyl acetate copolymer Examples thereof include ethylene copolymers such as a polymer, a carboxylated ethylene-vinyl acetate copolymer, an ethylene- (meth) acryl-maleic anhydride copolymer, and an ethylene-vinyl acetate- (meth) acrylate copolymer. ("(Meth) acryl" means "acryl or methacryl"). In addition, polyvinyl butyral (PVB) resin, epoxy resin, phenol resin, silicon resin, polyester resin, urethane resin, rubber adhesive, thermoplastic elastomers such as SEBS and SBS can be used, but good adhesion Acrylic resin adhesives and epoxy resins are easily obtained.

  The layer thickness is generally 10 to 50 μm, preferably 20 to 30 μm. In general, the optical filter can be equipped by heat-pressing the pressure-sensitive adhesive layer to a glass plate of a display.

  When EVA is also used as the material for the transparent pressure-sensitive adhesive layer, EVA has a vinyl acetate content of 5 to 50% by weight, preferably 15 to 40% by weight. When the vinyl acetate content is less than 5% by weight, there is a problem in transparency, and when it exceeds 40% by weight, the mechanical properties are remarkably deteriorated and the film formation becomes difficult and the films are easily blocked.

  As the cross-linking agent, an organic peroxide is suitable for heat cross-linking and is selected in consideration of sheet processing temperature, cross-linking temperature, storage stability, and the like. Examples of peroxides that can be used include 2,5-dimethylhexane-2,5-dihydroperoxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane-3; -Butyl peroxide; t-butylcumyl peroxide; 2,5-dimethyl-2,5-di (t-butylperoxy) hexane; dicumyl peroxide; α, α'-bis (t-butylperoxyisopropyl) ) Benzene; n-butyl-4,4-bis (t-butylperoxy) valerate; 2,2-bis (t-butylperoxy) butane; 1,1-bis (t-butylperoxy) cyclohexane; , 1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane; t-butylperoxybenzoate; benzoyl peroxide; Luperoxyacetate; 2,5-dimethyl-2,5-bis (tertiarybutylperoxy) hexyne-3; 1,1-bis (tertiarybutylperoxy) -3,3,5-trimethylcyclohexane; 1-bis (tert-butylperoxy) cyclohexane; methyl ethyl ketone peroxide; 2,5-dimethylhexyl-2,5-bisperoxybenzoate; tert-butyl hydroperoxide; p-menthane hydroperoxide; p-chlorobenzoyl Peroxides; tertiary butyl peroxyisobutyrate; hydroxyheptyl peroxide; chlorohexanone peroxide. These peroxides are used singly or in combination of two or more, and are usually used at a ratio of 5 parts by mass or less, preferably 0.5 to 5.0 parts by mass with respect to 100 parts by weight of EVA. .

  The organic peroxide is usually kneaded with EVA using an extruder, a roll mill or the like, but may be dissolved in an organic solvent, a plasticizer, a vinyl monomer or the like and added to the EVA film by an impregnation method.

  Various acryloxy group or methacryloxy group and allyl group-containing compounds can be added to improve EVA physical properties (mechanical strength, optical properties, adhesiveness, weather resistance, whitening resistance, crosslinking speed, etc.). . As the compound used for this purpose, acrylic acid or methacrylic acid derivatives, for example, esters and amides thereof are the most common. As the ester residue, in addition to alkyl groups such as methyl, ethyl, dodecyl, stearyl, lauryl, cyclohexyl groups , Tetrahydrofurfuryl group, aminoethyl group, 2-hydroxyethyl group, 3-hydroxypropyl group, 3-chloro-2-hydroxypropyl group and the like. Further, esters with polyfunctional alcohols such as ethylene glycol, triethylene glycol, polyethylene glycol, trimethylolpropane, and pentaerythritol can also be used. A typical amide is diacetone acrylamide.

  Examples thereof include polyfunctional esters such as acrylic or methacrylic acid esters such as trimethylolpropane, pentaerythritol, glycerin, triallyl cyanurate, triallyl isocyanurate, diallyl phthalate, diallyl isophthalate, diallyl maleate, etc. Examples include allyl group-containing compounds. These are used alone or in combination of two or more, and are usually used in an amount of 0.1 to 2 parts by weight, preferably 0.5 to 5 parts by weight, based on 100 parts by weight of EVA. .

  When EVA is crosslinked by light, a photosensitizer is usually used in an amount of 5 parts by mass or less, preferably 0.1 to 3.0 parts by mass based on 100 parts by mass of EVA instead of the peroxide.

  In this case, usable photosensitizers include, for example, benzoin, benzophenone, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, dibenzyl, 5-nitroacenaphthene, hexachlorocyclopentadiene, p-nitrodiphenyl. , P-nitroaniline, 2,4,6-trinitroaniline, 1,2-benzanthraquinone, 3-methyl-1,3-diaza-1,9-benzanthrone, and the like. Alternatively, two or more types can be mixed and used.

  Moreover, a silane coupling agent is used in combination as an adhesion promoter. As this silane coupling agent, vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycid Xylpropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-chloropropylmethoxysilane, vinyltrichlorosilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N- β (aminoethyl) -γ-aminopropyltrimethoxysilane and the like can be mentioned.

  The silane coupling agent is generally used in an amount of 0.001 to 10 parts by mass, preferably 0.001 to 5 parts by mass, based on 100 parts by mass of EVA, and one or more types are mixed and used.

  In addition, the EVA adhesive layer according to the present invention may further contain a small amount of an ultraviolet absorber, an infrared absorber, an anti-aging agent, a coating processing aid, a colorant, and the like. A small amount of a filler such as hydrophobic silica or calcium carbonate may be included.

  For example, after the EVA and the above-mentioned additive are mixed and kneaded with an extruder, a roll or the like, the adhesive layer is formed into a predetermined shape by a film forming method such as a calendar, roll, T-die extrusion, or inflation. Manufactured by.

  A protective layer may be provided on the antireflection layer. The protective layer is preferably formed in the same manner as the hard coat layer.

  The material of the release sheet provided on the transparent adhesive layer is preferably a transparent polymer having a glass transition temperature of 50 ° C. or higher. Examples of such a material include polyesters such as polyethylene terephthalate, polycyclohexylene terephthalate, and polyethylene naphthalate. In addition to polyamide resins such as nylon resins, nylon 46, modified nylon 6T, nylon MXD6, polyphthalamide, ketone resins such as polyphenylene sulfide and polythioether sulfone, and sulfone resins such as polysulfone and polyether sulfone, Mainly composed of polymers such as polyether nitrile, polyarylate, polyether imide, polyamide imide, polycarbonate, polymethyl methacrylate, triacetyl cellulose, polystyrene, polyvinyl chloride That the resin can be used. Of these, polycarbonate, polymethyl methacrylate, polyvinyl chloride, polystyrene, and polyethylene terephthalate can be suitably used. The thickness is preferably 10 to 200 μm, particularly preferably 30 to 100 μm.

  In the optical filter with the first electrode portion of the present invention, for example, a conductive layer is formed on one surface of a long transparent film so as to fill the width of the transparent film, and then a region other than a belt-like region at the end of the conductive layer. A hard coat layer, an antireflection layer, etc. are sequentially provided, and then a near infrared absorption layer and a transparent adhesive layer are provided on the other surface of the transparent film in the same area as the hard coat layer, or near infrared absorption on the back surface. The conductive layer is formed over the entire width of the surface of the long transparent film having the layer (and the transparent adhesive layer), and then narrower than the width on the conductive layer so as to leave a band-like region at both ends of the conductive layer. It can be manufactured by forming a hard coat layer in the region. The installation of each layer may be performed continuously or in a batch. What is necessary is just to cut | judge the elongate optical filter with a 1st electrode part obtained in this way, and to provide a 2nd electrode part in the end surface as mentioned above. As a coating machine used when applying (applying) each layer to a long transparent film, a slit die, a lip direct, a lip reverse, or the like can be used. When both surfaces are applied simultaneously, a double-sided simultaneous coating machine in which lip dies are arranged on both sides is generally used. These coating machines are particularly effective when coating with a limited width.

  When two long transparent films are used, the optical filter with the first electrode portion is provided with a hard coat layer, an antireflection layer, and the like sequentially on the other surface of one long transparent film. A conductive layer is provided on the surface of the long transparent film and a near-infrared absorbing layer and a transparent adhesive layer are provided on the back surface, and the laminate of these two sheets is attached to the back surface and the conductive layer of the transparent film with a hard coat layer. It can be easily manufactured by superimposing and integrating in a state of being arranged via the. What is necessary is just to cut | judge the elongate optical filter with a 1st electrode part obtained in this way, and to provide a 2nd electrode part as mentioned above.

  The display optical filter of the present invention thus obtained is used by being bonded to the surface of an image display glass plate of a display such as a PDP.

  Since the PDP display device of the present invention uses a plastic film as the transparent substrate, the optical filter of the present invention can be directly bonded to the surface of the glass plate, so that one transparent film is used. In this case, the PDP itself can contribute to weight reduction, thickness reduction, and cost reduction. Compared with the case where a front plate made of a transparent molded body is installed on the front side of the PDP, an air layer having a low refractive index can be eliminated between the PDP and the PDP filter, so that visible light reflection due to interface reflection can be achieved. Problems such as an increase in rate and double reflection can be solved, and the visibility of the PDP can be further improved.

Therefore, the display having the optical filter of the present invention is excellent in antireflection effect and antistatic property, hardly emits dangerous electromagnetic waves, is easy to see, is hardly attached with dust and the like, and can be called a safe display.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not limited to a following example.

[Example 1]
<Preparation of optical filter for display having first electrode part>
(1) Formation of mesh-like conductive layer On an easy-adhesion layer of a long polyethylene terephthalate film (width: 600 mm, length 100 m) having a thickness of 100 μm having an easy-adhesion layer (polyester polyurethane; thickness 20 nm) on the surface, A 20% aqueous solution of polyvinyl alcohol was printed in dots. The size of one dot is a square shape with one side of 234 μm, the interval between the dots is 20 μm, and the dot arrangement is a square lattice. The printing thickness is about 5 μm after drying.

  On top of that, copper was vacuum-deposited to an average film thickness of 4 μm. Next, it was immersed in room temperature water and rubbed with a sponge to dissolve and remove the dot portion, then rinsed with water and dried to form a mesh-like conductive layer on the entire surface of the polyethylene film.

  The conductive layer on the film surface had a square lattice shape corresponding to the negative pattern of dots accurately, the line width was 20 μm, and the aperture ratio was 77%. The average thickness of the conductive layer (copper layer) was 4 μm.

(2) Formation of hard coat layer The following formulation:
Dipentaerythritol hexaacrylate (DPHA) 80 parts by mass ITO (average particle size 150 nm) 20 parts by mass Methyl ethyl ketone 100 parts by mass Toluene 100 parts by mass Irgacure 184 (manufactured by Ciba Specialty Chemicals) 4 parts by mass

The coating liquid obtained by mixing was applied to a region other than the region of 15 mm from both ends (edges) in the width direction of the mesh-like conductive layer using a bar coater and cured by ultraviolet irradiation. Thereby, a 11 μm thick hard coat layer (refractive index 1.52) was formed on the mesh-like conductive layer.

(3) Formation of low refractive index layer The following formulation:
Opstar JN-7212 (manufactured by JSR Corporation) 100 parts by weight Methyl ethyl ketone 117 parts by weight Methyl isobutyl ketone 117 parts by weight

The coating liquid obtained by mixing was applied on the hard coat layer using a bar coater, dried in an oven at 80 ° C. for 5 minutes, and then cured by ultraviolet irradiation. Thereby, a low refractive index layer (refractive index 1.42) having a thickness of 90 nm was formed on the hard coat layer.

(4) Formation of near-infrared absorbing layer (having color tone correction function)
Polymethyl methacrylate 30 parts by mass TAP-2 (manufactured by Yamada Chemical Co., Ltd.) 0.4 parts by mass Plast Red 8380 (manufactured by Arimoto Chemical Co., Ltd.) 0.1 parts by mass CIR-1085 (manufactured by Nippon Carlit Co., Ltd.) ) 1.3 parts by mass IR-10A (manufactured by Nippon Shokubai Co., Ltd.) 0.6 parts by mass Methyl ethyl ketone 152 parts by mass Methyl isobutyl ketone 18 parts by mass was mixed on the entire back surface of the polyethylene film. It was applied using a bar coater and dried for 5 minutes in an oven at 80 ° C. Thereby, a near-infrared absorbing layer (having a color tone correction function) having a thickness of 5 μm was formed on the polyethylene film.

(5) Formation of transparent adhesive layer The following formulation:
SK Dyne 1811L (manufactured by Soken Chemical Co., Ltd.) 100 parts by mass Curing agent L-45 (manufactured by Soken Chemical Co., Ltd.) 0.45 parts by mass Toluene 15 parts by mass Ethyl acetate 4 parts by mass Was coated on the near infrared absorbing layer using a bar coater and dried in an oven at 80 ° C. for 5 minutes. This formed a 25-micrometer-thick transparent adhesive layer on the near-infrared absorption layer.

  Thus, an optical filter for display having the first electrode portion of the conductive layer protruding at the end portion in the width direction was obtained.

  The long display optical filter was cut in the width direction to obtain a display optical filter having first electrode portions at both ends in the width direction.

[Example 2]
An optical filter for display having the first electrode portion was obtained in the same manner as in Example 1 except that a high refractive index layer was provided as described below between the hard coat layer and the low refractive index layer.

(6) Formation of high refractive index layer The following formulation:
Dipentaerythritol hexaacrylate (DPHA) 6 parts by weight ZnO (average particle size 4 nm) 4 parts by weight Methyl ethyl ketone 100 parts by weight Toluene 100 parts by weight Irgacure 184 (manufactured by Ciba Specialty Chemicals) Was coated on the hard coat layer using a bar coater and cured by ultraviolet irradiation. As a result, a high refractive index layer (refractive index: 1.70) having a thickness of 90 nm was formed on the hard coat layer.

[Examples 3 and 4]
Pb-free solder (components: Sn 96.5%, Ag 3%, Cu 0.5%) is heated (220 ° C.) on the cut surfaces on both sides of the optical filter for display having the first electrode portion obtained in Examples 1 and 2. Thus, a second electrode portion of solder having a width (thickness) of 50 μm was formed.

[Examples 5 and 6]
A conductive adhesive (acrylic resin in which Ag-Cu powder is dispersed; trade name Doutite FE-107; Fujikura Kasei (on the cut surface on both sides of the optical filter for display having the first electrode portion obtained in Examples 1 and 2) Co., Ltd.) was applied and heated at 60 ° C. for 1 hour to form a second electrode portion of a conductive material-containing adhesive having a width (thickness) of 50 μm.

[Examples 7 and 8]
The range of 12 mm inward from the edge of the cut surface on both sides of the display optical filter having the first electrode portion obtained in Examples 1 and 2 is in contact with the top layer surface, and 15 mm so that 3 mm protrudes outward. A conductive aluminum tape having a thickness of 50 μm was disposed. Furthermore, a conductive adhesive (polyester resin in which Ag powder is dispersed; trade name DW-250H-5; manufactured by Toyobo Co., Ltd.) is applied so that the lower part of the conductive aluminum tape and the cut surface are in contact with each other at 130 ° C. Heating was performed for 1 hour to form a second electrode portion of the conductive material-containing adhesive having a width (thickness) of 50 μm.

[Example 9]
In Example 1, an optical filter for display having the first electrode portions at both ends in the width direction was obtained in the same manner except that (1) the formation of the mesh-like conductive layer was performed as follows.

  A copper foil having a thickness of 10 μm was attached to the entire surface of the adhesive layer of a long polyethylene terephthalate film (width: 600 mm, length 100 m) having a thickness of 100 μm having an adhesive layer (polyester polyurethane; thickness 20 nm) on the surface. . A dot pattern was formed on this copper foil by a photolithography method, and the exposed portion of the copper foil was etched to form a copper foil having a lattice pattern (wire diameter: 10 μm, pitch: 250 μm).

  The conductive layer on the film surface had a line width of 10 μm and an aperture ratio of 90%. The average thickness of the conductive layer (copper layer) was 10 μm.

[Example 10]
An optical filter for display having the first electrode portion was obtained in the same manner as in Example 9 except that a high refractive index layer was provided as described below between the hard coat layer and the low refractive index layer.

(6) Formation of high refractive index layer The following formulation:
Dipentaerythritol hexaacrylate (DPHA) 6 parts by weight ZnO (average particle size 4 nm) 4 parts by weight Methyl ethyl ketone 100 parts by weight Toluene 100 parts by weight Irgacure 184 (manufactured by Ciba Specialty Chemicals) Was coated on the hard coat layer using a bar coater and cured by ultraviolet irradiation. As a result, a high refractive index layer (refractive index: 1.70) having a thickness of 90 nm was formed on the hard coat layer.

[Examples 11 and 12]
Pb-free solder (components: Sn 96.5%, Ag 3%, Cu 0.5%) is heated (220 ° C.) on both sides of the display optical filter having the first electrode portion obtained in Examples 9 and 10. Thus, a second electrode portion of solder having a width (thickness) of 50 μm was formed.

[Examples 13 and 14]
A conductive adhesive (acrylic resin in which Ag-Cu powder was dispersed; trade name Doutite FE-107; Fujikura Kasei (on the cut surface on both sides of the optical filter for display having the first electrode part obtained in Examples 9 and 10) Co., Ltd.) was applied and heated at 60 ° C. for 1 hour to form a second electrode portion of a conductive material-containing adhesive having a width (thickness) of 50 μm.

[Examples 15 and 16]
The range of 12 mm inward from the edge of the cut surface on both sides of the optical filter for display having the first electrode portion obtained in Examples 9 and 10 is in contact with the top layer surface, and 15 mm so that 3 mm protrudes outward. A conductive aluminum tape having a thickness of 50 μm was disposed. Furthermore, a conductive adhesive (polyester resin in which Ag powder is dispersed; trade name DW-250H-5; manufactured by Toyobo Co., Ltd.) is applied so that the lower part of the conductive aluminum tape and the cut surface are in contact with each other at 130 ° C. Heating was performed for 1 hour to form a second electrode portion of the conductive material-containing adhesive having a width (thickness) of 50 μm.

  The obtained optical filter for display was evaluated as follows.

[Evaluation of optical filter]
(1) Conductivity A resistance meter (trade name: Miliohm Hitester; manufactured by Hioki Electric Co., Ltd.) was connected to the electrodes of the optical filter (two opposed second electrode portions), and the resistance value was measured.

  The results are shown in Table 1.

  In addition, the PDP filters obtained in Examples 3 to 8 and 11 to 16 are not inferior to conventional ones in transparency, electromagnetic wave shielding properties, etc. even when actually attached to the PDP. Can be performed very easily and contributes to the productivity of PDP production.

It is a top view of an example which shows the basic composition of the optical filter of this invention. It is a schematic sectional drawing of the A-A 'direction of the optical filter of this invention of FIG. It is a schematic sectional drawing of the B-B 'direction of the optical filter of this invention of FIG. It is a schematic sectional drawing of an example of a preferable aspect in the optical filter of this invention. It is a top view of the especially preferable optical filter in the optical filter of this invention. It is a top view of the optical filter of this invention of FIG. It is a schematic sectional drawing of an example of another preferable aspect in the optical filter of this invention.

Explanation of symbols

11, 21, 31, 41 Optical filter for display 12, 22, 32, 42A, 42B Transparent film 13, 23, 33, 43 Conductive layer 16, 26, 36, 46 Hard coat layer 17, 27, 37, 47 Antireflection Layers 14, 24, 34, 44 Near-infrared absorbing layer 15, 25, 35, 45 Transparent adhesive layer 18, 28, 38, 48 Electrode portion 39, 49 Conductive tape 50 Adhesive layer

Claims (25)

An optical filter for display comprising at least one transparent film, and a conductive layer, a hard coat layer and a near infrared absorption layer provided thereon,
A conductive layer is provided on the transparent film, and a hard coat layer or a near-infrared absorbing layer is provided on the conductive layer, and the transparent film and the conductive layer are laminated so as to protrude on opposite sides, The protruding portion forms the first electrode portion,
Furthermore, the 2nd electrode part is provided in the conductive layer which the transparent film and the conductive layer did not protrude, and was exposed in the end surface of the opposing both sides different from the said opposing both sides, The optical filter for a display characterized by the above-mentioned.   The optical filter for display according to claim 1, wherein the transparent film, the conductive layer, the hard coat layer, and the near-infrared absorbing layer have a rectangular shape. An optical filter for display comprising at least one transparent film, and a conductive layer, a hard coat layer and a near infrared absorption layer provided thereon,
The shape of the transparent film, conductive layer, hard coat layer and near infrared absorption layer is rectangular,
A conductive layer is provided on the transparent film, and a hard coat layer or a near-infrared absorbing layer is provided on the conductive layer.
The transparent film and the conductive layer have the same vertical and horizontal lengths, and the layers provided on the conductive layer have the same vertical and horizontal lengths, the other is longer, and are transparent. The film, the conductive layer, and the layer on the conductive layer are flush with each other in the longitudinal and lateral lengths in the same direction, and the transparent film and the conductive layer are elongated in the direction in which the transparent film and the conductive layer are elongated. The layers are stacked so as to protrude on both sides, and the protruding portion forms the first electrode portion,
Furthermore, the second electrode portion is provided on the conductive layer exposed at the end face that is flush with the display optical filter. The layers other than the layer provided on the conductive layer are the same in length and width as the conductive layer, and the transparent film and all layers are all films in the length and width. And the layers other than the layers provided on the transparent film and the conductive layer are flush with each other in the direction in which the layers are the same, so that they protrude on both sides in the direction longer than the layer on the conductive layer. Laminated, and the protrusion forms a first electrode part,
The display-use optical filter according to claim 3, wherein the second electrode portion is provided on the conductive layer exposed on the end face that is flush with the other. An optical filter for a display in which a conductive layer and a hard coat layer are provided in this order on one surface of a transparent film, and a near-infrared absorbing layer is provided on the other surface,
The shape of the transparent film, conductive layer, hard coat layer and near infrared absorption layer is rectangular,
The length and width of the transparent film and the conductive layer are the same as each other, and the length of one of the length and width is the same as that of the hard coat layer, and the other is lengthened.
The near-infrared absorbing layer is the same in length and width as the conductive layer, and the transparent film and all layers have the same length and width in the direction in which all films and layers are the same. The transparent film and the conductive layer are laminated so that they protrude on both sides in a direction longer than the hard coat layer, and the protruding portion forms the first electrode portion.
Furthermore, the second electrode portion is provided on the conductive layer exposed at the end face that is flush with the display optical filter. Two transparent films, a transparent film provided with a hard coat layer on one surface and another transparent film provided with a conductive layer on one surface, are the back surface of the former transparent film and the latter transparent film. In the state where the conductive layer is opposed to the adhesive layer through the adhesive layer, the optical filter for display is bonded,
The conductive film and the transparent film having the conductive layer are laminated so as to protrude on opposite sides, and the protruding portion forms the first electrode portion,
Further, a second electrode portion is provided on the conductive layer exposed on the opposite end faces different from the opposite sides, on which the conductive layer and the transparent film having the conductive layer are not projected, and the display optical device filter. Two transparent films, a transparent film provided with a hard coat layer on one surface and another transparent film provided with a conductive layer on one surface, are the back surface of the former transparent film and the latter transparent film. In the state where the conductive layer is opposed to the adhesive layer through the adhesive layer, the optical filter for display is bonded,
The shape of the two transparent films, the hard coat layer and the conductive layer is rectangular, and the transparent film having the conductive layer has the same vertical and horizontal lengths, and one of the vertical and horizontal lengths is the hard coat layer. And the other is longer,
The transparent film having the hard coat layer has the same vertical and horizontal length as the hard coat layer, and
The two transparent films, the conductive layer and the hard coat layer were flush with each other in both the longitudinal and lateral lengths in the direction in which all the films and layers were the same, and the transparent film and the conductive layer were lengthened. Are laminated so that they protrude on both sides in the direction, the protrusions form the first electrode part,
Further, the second electrode portion is provided on the conductive layer exposed on the end face that is flush with the display optical filter.   The optical filter for display according to any one of claims 1 to 7, wherein the second electrode portion is formed of a conductive material-containing adhesive.   The display-use optical filter according to claim 1, wherein the second electrode portion is formed of solder.   A long conductive tape is provided so that a portion of the rectangular surface of the hard coat layer or the uppermost layer provided thereon protrudes into the end region of at least two opposing sides where the second electrode portion is provided. The display-use optical filter according to claim 1, wherein at least a part of the protruding portion is bonded to the second electrode portion.   The long conductive tape is bonded to the hard coat layer or the end regions of the two opposite sides of the uppermost layer provided thereon so that the sides and the longitudinal direction of the tape are parallel to each other. An optical filter for display as described in 1.   The optical filter for display according to claim 6 or 7, wherein a near-infrared absorbing layer is provided on the entire back surface of the transparent film having a hard coat layer.   The optical filter for display according to claim 6 or 7, wherein a near-infrared absorbing layer is provided on the entire back surface of the transparent film having a conductive layer.   The optical filter for display according to any one of claims 1 to 13, wherein the conductive layer is a mesh-like conductive layer.   The optical filter for display according to any one of claims 1 to 14, wherein a low refractive index layer is further formed on the hard coat layer.   The optical filter for display according to any one of claims 1 to 5 and 8 to 15, wherein the near-infrared absorbing layer has adhesiveness.   The optical filter for display according to any one of claims 1 to 5 and 8 to 15, wherein a transparent pressure-sensitive adhesive layer is provided on the surface of the near infrared absorption layer opposite to the transparent film.   The optical filter for a display according to any one of claims 14 to 17, wherein a hard coat layer is embedded in the mesh gap of the mesh-like conductive layer.   The optical filter for display according to any one of claims 1 to 18, wherein the transparent film is a plastic film.   The optical filter for display according to any one of claims 16 to 19, wherein a release sheet is provided on the transparent adhesive layer or the adhesive near-infrared absorbing layer.   It is a filter for plasma display panels, The optical filter for displays of any one of Claims 1-20.   Form a conductive layer over the entire width of the surface of the long transparent film having a near-infrared absorbing layer on the back side, and then leave a band-like region at both ends of the conductive layer in a region narrower than its width. By forming a hard coat layer, a laminated body having a conductive layer projecting on both sides as a first electrode part is formed, and a rectangular laminated body is produced by cutting in the width direction. Further, a cut surface of the rectangular laminated body A second electrode portion is provided on the conductive layer exposed at the end face.   A conductive layer is formed over the entire length of the long transparent film in the width direction, and then a hard coat layer is formed on the conductive layer in a region narrower than the width so as to leave a band-shaped region at both ends of the conductive layer. By forming a near-infrared absorbing layer on the back side of the scale-like transparent film, a laminated body having a conductive layer protruding on both sides as a first electrode portion is formed, and then cut in the width direction to produce a rectangular laminated body, Furthermore, the second electrode portion is provided on the conductive layer exposed on the end face which is the cut surface of the rectangular laminated body.   The display optical filter of any one of Claims 1-21 is bonded together on the surface of the image display glass plate, The display characterized by the above-mentioned. A plasma display panel, wherein the display optical filter according to any one of claims 1 to 21 is bonded to a surface of an image display glass plate.

Images