JP5703050B2 - Electromagnetic wave shielding material and plasma display panel with the same - Google Patents

Description

  The present invention generally relates to an electromagnetic wave shielding material, and more particularly, to an electromagnetic wave shielding material which is integrated so as to be wound in a roll shape and improved so as to be easily grounded. The present invention also relates to a plasma display panel provided with such an electromagnetic wave shielding material.

  FIG. 4 is a conceptual diagram of a conventional plasma display panel. FIG. 5 is a cross-sectional view taken along the line VV in FIG.

  With reference to these drawings, a filter 23 is disposed on the front side of the display unit 22 of the plasma display panel 21. The filter 23 includes a glass substrate layer 24, an antireflection film 25, a mesh film 26 and a protective film 27. The antireflection film 25 is formed by coating an antireflection film 5a on a PET film. The mesh film 26 is formed by forming a conductive mesh 6a on a PET film. The protective film 27 is formed of a PET film. The glass base material layer 24, the antireflection film 25, the mesh film 26, and the protective film 27 are bonded together with the adhesive layers 8a, 8b, and 8c, respectively.

  Referring to FIG. 6, the conductive mesh 6a is formed in a lattice shape by screen printing using, for example, a silver paste. The connection pads 6b connected to the conductive gasket 29 are also formed simultaneously with the conductive mesh 6a by screen printing so as to surround the grid.

  As shown in FIG. 4, the filter 23 is pressed and fixed to the front surface of the plasma display panel 21 so that the conductive gasket 29 and the connection pad 6b are in contact with each other.

  The harmful electromagnetic wave emitted from the plasma display panel 21 is captured by the conductive mesh 6a, passes through the connection pad 6b, the conductive gasket 29, and the casing, and is connected to the ground to escape.

Japanese Patent Application No. 2010-136340

  In the conventional method, as described above, since the number of adhesive / film layers is large, the number of parts is large, the work is complicated, and the cost is high. In addition, since the optical filter is formed of a glass substrate, it is easy to break, the roll-to-roll flow operation cannot be performed, and the work efficiency is lowered.

  An object of the present invention is to provide an electromagnetic wave shielding material improved so that roll-to-roll can be realized and can be wound into a roll, integrated and easily grounded.

  Another object of the present invention is to provide a plasma display panel on which such an electromagnetic wave shielding material is mounted.

The electromagnetic wave shielding material according to the present invention includes a PET base material layer, an ink receiving layer provided on one surface of the PET base material layer for preventing bleeding of the conductive paste ink, and the ink receiving layer. An electromagnetic wave shielding mesh layer provided in a lattice shape on the upper surface and a functional layer provided on the ink receiving layer so as to cover the electromagnetic wave shielding mesh layer. The functional layer is provided with a through-hole for grounding that penetrates the functional layer and exposes a part of the electromagnetic shielding mesh layer. A ground lead wire is formed from the conductive paste filled in the through hole.

By filling the through hole with a conductive paste, a ground lead wire is formed, so that the ground can be easily taken. Since the said base material layer is formed with a polyethylene terephthalate, it can wind up in roll shape by adjusting a film thickness.

  It is preferable that a plurality of the through holes are provided side by side in the vertical or horizontal direction.

The through hole is preferably drilled with a laser.
The functional layer is formed by curing a polymerizable binder coating solution, and includes a hard coat functional layer having a hard coat function, an antireflection functional layer having an antireflection function, and an antiglare functional layer having an antiglare function. An antistatic functional layer having an antistatic function, and the like. The functional layer is a single layer or a plurality of layers having a plurality of functions among the above functions.

  The polymerizable binder coating liquid contains an ultraviolet curable resin, a photopolymerizable initiator, and the like. A hard coat layer is obtained by applying a known polymerizable binder coating solution and curing by irradiation with ultraviolet rays or heating. This polymerizable binder coating solution may contain other components in addition to the above resin as long as the effects of the present invention are not impaired. Other components are not particularly limited, and for example, translucent organic fine particles may be added to the polymerizable binder coating liquid in order to develop an antiglare function in the hard coat layer. In order to develop an antistatic function in the hard coat layer, conductive fine particles such as ITO (indium-tin composite oxide) fine particles, ATO (antimony-tin composite oxide) fine particles, and zinc antimonate fine particles may be added. Good.

  Furthermore, in order to express the antireflection function, an antireflection layer can be provided on the hard coat layer.

  The antireflection layer is formed by applying and curing a high refractive index layer / low refractive index layer or a low refractive index layer on the coating surface of the functional layer 8.

  The high refractive index layer is formed by curing a high refractive index layer coating liquid containing an inorganic material, an ultraviolet curable resin, or the like.

  As the inorganic material, zinc oxide, titanium oxide, cerium oxide, tin oxide, aluminum oxide, zirconium oxide, or the like can be used.

  The refractive index of the high refractive index layer needs to be higher than that of the low refractive index layer formed immediately above the high refractive index layer, and the refractive index is preferably in the range of 1.55 to 1.90. Is within.

  The optical film thickness (nd) of the high refractive index layer is preferably 100 nm to 250 nm.

  The low refractive index layer is formed by curing a coating solution for forming a low refractive index layer containing silica fine particles, a binder component and the like.

  As the silica fine particles, silica sol, porous silica fine particles, hollow silica fine particles and the like can be used. As the binder component, a simple substance or a mixture of a fluorine-containing organic compound, a simple substance or a mixture of a fluorine-free organic compound, a polymer, or the like can be used.

  The refractive index of the low refractive index layer is preferably in the range of 1.20 to 1.45. The optical film thickness (nd) of the low refractive index layer is preferably 100 nm to 175 nm.

  The electromagnetic shielding mesh layer is formed by printing a conductive silver paste by a screen printing method.

  A plasma display panel according to another aspect of the present invention is provided with an electromagnetic shielding material having the above-described characteristics.

  When the present invention is used, functions such as antireflection properties, hard coat properties, antiglare properties, antistatic properties, and electromagnetic wave shielding properties can be created on a single base film (for example, PET film) by coating or printing. Therefore, the front filter can be basically constituted by a single bonding. Further, since the functional layer is provided with a through-hole for grounding that penetrates the functional layer and exposes a part of the electromagnetic wave shielding mesh layer, the grounding can be easily performed.

It is a conceptual diagram of the plasma display panel which affixed the electromagnetic wave shielding material which concerns on this invention. It is a top view of the electromagnetic wave shielding material which concerns on this invention. It is sectional drawing which follows the III-III line in FIG. It is a disassembled perspective view of the functional film with which the conventional plasma display panel is mounted. It is sectional drawing which follows the VV line in FIG. It is a top view of the conventional electroconductive mesh.

  For the purpose of obtaining an electromagnetic shielding material which can be wound up in a roll, integrated and improved so that it can be easily grounded, PET is used for the base material layer, and these are used for the functional layer. This is realized by providing a through hole for grounding that exposes a part of the electromagnetic shielding mesh layer. Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a conceptual diagram of a plasma display panel equipped with an electromagnetic shielding material including a transparent conductive sheet according to an embodiment. FIG. 2 is a plan view of the electromagnetic wave shielding material. 3 is a cross-sectional view taken along line III-III in FIG.

  With reference to these drawings, the electromagnetic wave shielding material 1 is used by being mounted on the display unit 3 of the plasma display panel 2 and blocks electromagnetic waves emitted from the plasma television.

  The electromagnetic shielding material 1 includes a PET base material layer 4 made of polyethylene phthalate (PET) having a thickness of 75 to 100 μm. An undercoat layer 5 (1 μm thickness) and an ink receiving layer 6 (1 μm) for preventing bleeding of the conductive paste ink are provided on one surface of the PET base material layer 4. The ink receiving layer 6 is formed of a transparent porous material that is an aggregate of fine particles mainly composed of silica, titania, alumina, or the like. On the ink receiving layer 6, there is provided a grid-like electromagnetic shielding mesh layer 7 formed by screen-printing a conductive paste ink and firing it. The undercoat layer 5 has a function of blocking diffusion of oligomer components and additives generated from the PET component of the base material layer 4 toward the electromagnetic wave shielding mesh layer 7 when the silver paste ink is baked. Is provided.

  A functional layer 8 is provided on the ink receiving layer 6 so as to cover the electromagnetic shielding mesh layer 7. The functional layer 8 is composed of a hard coat layer formed by curing a polymerizable binder coating solution containing ATO (antimony-tin composite oxide) fine particles, and an antireflection layer provided thereon. The antireflection layer comprises an optical film thickness (nd): 150 nm, a refractive index (n): 1.60, a high refractive index layer, and an optical film thickness (nd) provided on the high refractive index layer: 140 nm, Refractive index (n): It consists of a low refractive index layer of 1.35.

  The functional layer 8 is provided with a through-hole 9 for grounding that penetrates the functional layer 8 and exposes a part of the electromagnetic wave shielding mesh layer 7. By filling the through hole 9 with a conductive paste so as to be electrically connected to the electromagnetic wave shielding mesh layer 7, an earth lead line can be easily formed. Harmful electromagnetic waves emitted from the plasma television are captured by the electromagnetic wave shielding mesh layer 7, passed through the ground lead wire and the casing formed of the conductive paste filled in the through holes 9, and connected to the ground to escape. .

  A back coat layer 10 is provided on the other surface of the PET base material layer 4.

  A plurality of through-holes 9 are provided vertically or horizontally. The through hole 9 is drilled with a laser.

  The film thickness of the PET base material layer 4 is set to such a thickness that the electromagnetic wave shielding material can be wound into a roll.

  Examples of the coating method of the functional layer 8 include a method of applying ultraviolet rays after coating and drying on a base film by a roll coating method, a spin coating method, a coil bar method, a dip coating method, a die coating method or the like. A method capable of continuous coating such as a roll coating method is preferred from the viewpoint of productivity and production cost.

  According to the present embodiment, an electromagnetic wave shielding material having an antireflection function, a hard coat function, an antiglare function, an antistatic function, and an electromagnetic wave shielding function can be obtained in the form of a single film, so that the number of parts is small, and the work is It becomes easy to do. Since the base material layer 4 is formed of polyethylene terephthalate, it can be wound into a roll by adjusting the film thickness, and a roll-to-roll operation can be realized.

  The undercoat layer 5 can be formed of a UV curable acrylic urethane resin or epoxy acrylate to shorten the process and improve the productivity, but may be formed of a thermosetting resin.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The electromagnetic wave shielding material according to the present invention has an antireflection function, a hard coat function, an antiglare function, an antistatic function, and an electromagnetic wave shielding function with a single film, and can easily be grounded.

DESCRIPTION OF SYMBOLS 1 Electromagnetic shielding material 2 Plasma display panel 3 Display part 4 PET base material layer 5 Undercoat layer 6 Ink receiving layer 7 Electromagnetic wave shielding mesh layer 8 Functional layer 9 Through-hole 10 Backcoat layer

Claims (6)

A PET substrate layer;
An ink receiving layer provided on one surface of the PET base material layer for preventing bleeding of the conductive paste ink;
An electromagnetic wave shielding mesh layer provided in a grid pattern on the ink receiving layer;
A functional layer provided on the ink receiving layer so as to cover the electromagnetic shielding mesh layer;
The functional layer is provided with a through hole for grounding, through which the part of the electromagnetic shielding mesh layer is exposed .
An electromagnetic wave shielding material in which a ground lead wire is formed from a conductive paste filled in the through hole . The electromagnetic wave shielding material according to claim 1, wherein the functional layer is at least one functional layer among a hard coat functional layer, an antireflection functional layer, an antiglare functional layer, and an antistatic functional layer.   The electromagnetic wave shielding material according to claim 1, wherein a plurality of the through holes are provided side by side in the vertical or horizontal direction.   The electromagnetic wave shielding material according to claim 1, wherein the through hole is drilled with a laser.   The electromagnetic shielding material according to any one of claims 1 to 4, wherein the thickness of the base material layer is such that the electromagnetic shielding material can be wound into a roll shape.   The plasma display panel formed by mounting | wearing with the electromagnetic wave shielding material of any one of Claims 1-5.

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