JP2000216589A - Electromagnetic shield structure of display panel - Google Patents

Abstract

(57) [Problem] To provide an electromagnetic wave shielding structure of a display panel which can simplify a process of blocking electromagnetic waves generated from a display panel and has no problem which occurs when an electromagnetic wave shielding panel is used. An electromagnetic wave shielding structure of a display panel (1) in which a display panel (1) is covered with an electromagnetic wave shielding film (2), wherein the electromagnetic wave shielding film (2) is at least the display panel (1). Is formed from a laminated film having a transparent substrate film layer (21) and a transparent adhesive layer (22), and is adhered to the front plate via the transparent adhesive layer (22). It is characterized by having.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding structure for shielding an electromagnetic wave generated from a display panel, and more particularly to an electromagnetic wave shielding structure of a display panel in which the entire display panel is covered with an electromagnetic wave shielding film. .

[0002]

2. Description of the Related Art In order to block electromagnetic waves generated from a display panel, an electromagnetic wave shield panel is mounted on a front panel of the display panel. Further, in order to prevent leakage of electromagnetic waves from the peripheral side of the display panel, an external case of the display panel is provided with an electromagnetic wave shielding function. As the above-mentioned electromagnetic wave shield panel, a panel in which an electromagnetic wave shield layer is formed on a transparent substrate such as an acrylic plate or a glass plate, or a panel in which a film having an electromagnetic shield function is attached to the transparent substrate is used. Further, as the outer case, a plastic plate is provided with an electromagnetic wave shielding function by giving a nickel plating, a plastic plate,
There are used those provided with an electromagnetic wave shielding function by providing a dry film formed by spray-coating a conductive coating agent, and those coated with a conductive material (such as metal) by insulation.

[0003]

The conventional electromagnetic wave shielding structure of a display panel using the above-mentioned electromagnetic wave shielding panel and the above-mentioned case for external use is to attach the electromagnetic wave shield panel to a front plate and to provide the case for external use with an electromagnetic wave shielding function. In addition, the manufacturing process such as connection between the electromagnetic wave shield panel and the exterior case is complicated.

As a method of mounting the electromagnetic wave shield panel, a close contact arrangement (contact type) in which the electromagnetic wave shield panel is mounted in contact with the front panel of the display panel.
And a gap arrangement type (non-contact type) in which a gap is provided between the electromagnetic wave shield panel and the front panel of the display panel. There is a problem of mixing and adhesion of dust to the gap between the substrates, a problem of generation of a warp when an acrylic plate is used as a substrate, and a problem of a weight when a glass plate is used as a substrate. In addition, in the case of the close contact arrangement type, there is a problem that it is difficult to mount an electromagnetic wave shielding panel on a front panel of a display panel such as a plasma display panel which generates heat at a high temperature due to heat resistance.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electromagnetic wave shielding structure of a display panel which can simplify a process of blocking electromagnetic waves generated from the display panel and has no problem which is caused when the electromagnetic wave shielding panel is used. It is in.

[0006]

Means for Solving the Problems The present inventors can directly affix the electromagnetic wave to a front panel of an electronic device that generates heat at a high temperature, such as a plasma display panel (hereinafter abbreviated as PDP). An electromagnetic wave shielding film which does not have a problem which occurs when a shield panel is used and which can be easily mounted simply by cutting according to the shape of an electronic device has been previously proposed (see Japanese Patent Application No. 10-155945). An object of the present invention is to simplify a process of blocking electromagnetic waves generated from a display panel using the above-mentioned electromagnetic wave shielding film.

That is, the present invention relates to an electromagnetic wave shielding structure of a display panel in which a display panel is covered with an electromagnetic wave shielding film, wherein at least a portion of the electromagnetic wave shielding film which covers a front panel of the display panel is transparent. The present invention provides an electromagnetic wave shielding structure for a display panel, which is formed from a laminated film having a base film layer and a transparent adhesive layer, and is attached to the front plate via the transparent adhesive layer. .

According to the electromagnetic wave shielding structure of the display panel of the present invention, the steps of mounting the electromagnetic wave shielding panel on the front panel, providing the external case with the electromagnetic wave shielding function, and connecting the electromagnetic wave shielding panel to the external case are performed. In addition, the process of shielding the display panel from electromagnetic waves can be simplified, and the number of components required for the process is reduced. In addition, since it is not necessary to provide the outer case with an electromagnetic wave shielding function, the range of choice of materials for the outer case is expanded.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electromagnetic wave shielding structure of a display panel according to the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a sectional view showing an example in which the electromagnetic wave shielding structure of the display panel of the present invention is applied to a PDP, and FIG. 2 is a developed view of the electromagnetic wave shielding film used in the embodiment shown in FIG. As shown in FIG. 1, the electromagnetic wave shielding structure of the present embodiment includes a PDP 1 including a light emitting panel 11 and a driving printed wiring board 12 disposed on the back side of the light emitting panel 11.
The electromagnetic wave shielding film 2 is covered so as to be wrapped.

[0010] The electromagnetic wave shielding film 2 is cut into a shape of a developed view as shown in FIG. 2, and a portion (surface A in FIG. 2) covering the front plate of the light emitting panel 11 is a transparent base film. It is formed from a laminated film having a layer 21 and a transparent adhesive layer 22, and is directly adhered to the front panel of the light emitting panel 11 via the transparent adhesive layer 22, as shown in FIG.

The portions (B, C, D and E in FIG. 2) of the electromagnetic wave shielding film 2 other than the portion covering the front plate (A in FIG. 2) are The respective tips are connected to the ground pattern of the driving printed wiring board 12.
The joints of the B, C, D, and E sides are sealed with a conductive copper foil tape or the like. In FIG. 2, reference numeral 2a denotes a hot air exhaust hole.

The electromagnetic wave shielding film 2 includes:
As a method of connecting the driving printed wiring board 12 to the ground pattern, for example, as shown in FIG. 3, a method using a conductive copper foil tape 3 (FIG. 3A), a method using a conductive double-sided tape 4 [FIG. 3 (b)], a method of applying a conductive copper foil tape 3 to an electromagnetic wave shielding film and soldering it to a ground pattern 13 [FIG. 3 (c)], applying and curing an Ag paste 5 on the electromagnetic wave shielding film, A method of soldering to the ground pattern 13 (FIG. 3D) or a method of using a conductive adhesive (such as a silicon-based, acrylic-based, or epoxy-based) 6 (FIG. 3E) is exemplified. In FIG. 3, 7 is a solder, 23 is an electromagnetic wave shielding layer made of a conductive material layer provided on the outer surface or the inner surface of the transparent base film layer 21, and 24 is a transparent base film layer 21. This is an insulating coat formed on the surface of the electromagnetic wave shield layer 23 provided on the inner surface except for a portion connected to the ground pattern 13.

Although the embodiment of the present invention has been described with reference to the drawings showing an electromagnetic wave shielding structure of a display panel, the present invention is not limited to this embodiment. Using an electromagnetic wave shielding film formed of a laminated film having a transparent base film layer and a transparent adhesive layer, attaching the electromagnetic wave shielding film to the front plate via the transparent adhesive layer, and shielding the display panel from the electromagnetic wave shielding The present invention encompasses any device that is configured to be covered with a film so as to be able to block electromagnetic waves generated from the display panel. Further, the present invention can be applied to electromagnetic wave shields of various display panels such as CRT, LCD, EL, PALC (plasma-addressed liquid crystal) in addition to PDP.

Further, the electromagnetic wave shielding film used in the electromagnetic wave shielding structure of the display panel of the present invention is not limited to the one used in the embodiment shown in the drawings. Hereinafter, a preferred electromagnetic wave shielding film used in the present invention will be described.

As the transparent base film layer constituting the electromagnetic wave shielding film, a polycarbonate film, an acrylic film, a triacetate film, a polyethylene terephthalate film and the like are used, and among these, an acrylic film and a triacetate film are preferable. The portion of the electromagnetic wave shielding film that covers the front plate (surface A in FIG. 2) needs to have transparency, but other portions (surfaces B, C, D, and E in FIG. 2).
Since transparency is not required, it is not always necessary to use a transparent substrate film as the substrate film in these portions.

Further, as the transparent adhesive layer constituting the electromagnetic wave shielding film, the heat-resistant durability time is 100 ° C. at 80 ° C.
More than 00 hours, preferably 30,000 hours or more formed with an acrylic or silicone pressure-sensitive adhesive, specifically, the acrylic pressure-sensitive adhesive, isocyanate or metal chelate Examples of the crosslinked acrylic pressure-sensitive adhesive include the above-mentioned silicone-based pressure-sensitive adhesives. Examples of the above-mentioned silicone-based pressure-sensitive adhesive include condensation-type or addition-type crosslinked silicone-based pressure-sensitive adhesives. It is preferable to add a heat stabilizer such as a hindered phenol to the pressure-sensitive adhesive. The heat-resistant durability time of the pressure-sensitive adhesive was measured by the following method. [Measurement method of heat-resistant endurance time of adhesive] Cut an electromagnetic wave shielding film into a 10 cm square, affix it to a transparent glass plate, leave it at room temperature for 1 day, and put it in a constant temperature tester at 80 ° C.
After 0000 hours and 30,000 hours, the film was taken out and visually inspected for occurrence of abnormalities such as peeling of the film, floating of the edge, and coloring of the adhesive.

The electromagnetic wave shielding film may have an electromagnetic wave shielding function by providing an electromagnetic wave shielding layer made of a conductive material layer on the outer surface or the inner surface of the transparent substrate film layer. An electromagnetic wave shielding function may be provided by kneading a conductive substance into the film layer. As the conductive material of the material for forming the electromagnetic wave shielding layer and the conductive material kneaded into the transparent substrate film layer,
Indium oxide, tin oxide, zinc oxide, magnesium oxide, antimony oxide, gold, silver and the like can be mentioned. Among them, indium oxide and tin oxide are preferable. Also,
Means for forming the electromagnetic wave shielding layer (conductive material layer) include a vacuum deposition method, a sputtering method, a method of forming a mesh of a conductive material using a photoresist, and mixing the conductive material with an organic binder such as acrylic or polyester. Coating method.

Further, the electromagnetic wave shielding film may be provided with an infrared cut layer made of a transparent thin film formed by applying or vacuum depositing or sputtering an infrared absorbing agent on the outer surface or inner surface of the transparent substrate film layer. Alternatively, an infrared ray absorbing function may be imparted to the transparent substrate film layer by kneading the infrared absorbent into the transparent substrate film layer. When the electromagnetic wave shielding layer and the infrared ray cut layer are provided on the surface of the transparent substrate film layer, they may be provided on the same surface or on different surfaces, and the order of the layers is not limited. Examples of the infrared absorber include inorganic infrared absorbers such as metal complexes such as indium oxide, tin oxide and nickel, diimonium-based, aminium-based, and organic infrared absorbers such as anthraquinone-based. It is preferable to use several different types in combination.

The electromagnetic wave shielding film may be provided with a hard coat layer, an antireflection layer and an antiglare layer as a surface layer in order from the outside to the inside. As the hard coat layer, the antireflection layer, and the antiglare layer, the same layers as those used in a conventional electromagnetic wave shield panel can be used. For example, as the hard coat layer, a transparent thin film obtained by applying an acrylic or silicone resin and curing it with heat or light is used. Further, as the anti-reflection layer, a transparent thin film formed by coating or vacuum-depositing or sputtering a low-refractive-index resin such as a fluororesin or a silicone-based resin or a low-refractive-index compound such as magnesium fluoride or silicon dioxide. Is used. Furthermore, when a so-called multilayer film coat is used in which high-refractive-index compounds such as cerium fluoride, alumina, zirconium oxide, and titanium dioxide are alternately laminated with the low-refractive-index resin or compound, a more visible light The anti-reflection effect increases, and the infrared rays can be reflected at the same time, so that the infrared ray cutting function can be simultaneously provided. As the antiglare layer, a transparent thin film formed by mixing and applying transparent fine particles such as silica with an organic binder such as an acrylic polymer or polyester is used.

Further, in the electromagnetic wave shielding film, a benzotriazole-based, benzophenone-based, cyanoacrylate-based,
By kneading an ultraviolet absorber such as ultrafine metal oxide, or by providing an ultraviolet cut layer consisting of a transparent thin film of the above ultraviolet absorber between the transparent base film layer and the hard coat layer, Functions can also be provided. Furthermore, instead of providing an anti-reflection layer and an anti-glare layer, an acrylic or silicone resin as a material for forming a hard coat layer may be replaced with a resin or compound having the same low refractive index as the material for forming an anti-reflection layer, or an anti-glare layer. An anti-reflection function and an anti-glare function can also be imparted by kneading transparent fine particles such as silica as the material for forming the layer.

The total thickness of the electromagnetic wave shielding film is usually 50 to 1000 μm, preferably 80 to 500 μm.
μm, and the thickness of each layer is preferably as follows. -Transparent substrate film layer: usually 10 to 500 m, preferably 30 to 200 m. -Electromagnetic wave shielding layer: usually 0.01 to 100 m, preferably 0.02 to 50 m. -Transparent adhesive layer: usually 10 to 100 m, preferably 2
0-50 μm. Hard coat layer: usually 0.5 to 20 μm, preferably 1 to 10 μm. -Antireflection layer: Usually 0.001 to 10 m, preferably 0.01 to 3 m.・ Anti-glare layer: usually 1 to 30 μm, preferably 2 to 15 μm
m.

[0022]

According to the electromagnetic wave shielding structure of the display panel of the present invention, the process of blocking the electromagnetic waves generated from the display panel can be simplified, and there is no problem that occurs when the electromagnetic wave shielding panel is used.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example in which an electromagnetic wave shielding structure of a display panel according to the present invention is applied to a PDP.

FIG. 2 is a development view of an electromagnetic wave shielding film used in the embodiment shown in FIG.

FIGS. 3 (a), (b), (c), (d) and (e) are enlarged cross-sectional views of a connection portion between an electromagnetic wave shielding film and a driving printed wiring board, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display panel (PDP) 2 Electromagnetic wave shielding film 11 Light emitting panel 12 Printed wiring board for driving 21 Transparent base material film layer 22 Transparent adhesive layer

Claims (3)

[Claims] An electromagnetic wave shielding structure for a display panel comprising a display panel covered with an electromagnetic wave shielding film, wherein at least a portion of the electromagnetic wave shielding film which covers a front panel of the display panel is a transparent substrate film layer. And an electromagnetic wave shielding structure for a display panel, wherein the electromagnetic wave shielding structure is formed from a laminated film having a transparent adhesive layer and is attached to the front plate via the transparent adhesive layer. 2. The electromagnetic wave shielding structure according to claim 1, wherein the display panel is a plasma display panel. 3. The method according to claim 1, wherein the transparent adhesive layer has a heat resistant durability time of 8 hours.
2. The electromagnetic wave shielding structure according to claim 1, wherein the electromagnetic wave shielding structure is formed of an acrylic or silicone pressure-sensitive adhesive at 0 ° C. for 10,000 hours or more.