JPH11212475A - Display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To actualize productivity improvement and cost reduction by making a display panel lightweight and thin and decreasing the number of the components by providing a plasma display panel main body and an electromagnetic wave shield material adhered to its front with a transparent adhesive and using a chromatic transparent adhesive as the transparent adhesive. SOLUTION: The display panel 1 is constituted by using intermediate films 4A to 4C for adhesion, at least one of which serves as an adhesive consisting of chromatic transparent resin, between a transparent substrate 2 and the plasma display panel main body 20 and sticking and adhering conductive meshes 3 and a transparent conductive mesh film 5 in one body. The peripheral edge part of the conductive meshes 3 projecting from the peripheral edge part of the transparent substrate 2 are folded along the peripheral edge of the transparent substrate 2 and stuck on the transparent substrate 2 with a conductive tacky adhesive tape 7. The conductive tacky adhesive tape 7 has a conductive adhesive layer 7B formed on one surface of metal foil 7A. As the adhesive, an adhesive obtained by blending a setting agent with epoxy-based or phenol- based resin or an acryl-based tacky adhesive, etc., is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas discharge type display panel using a plasma display panel (hereinafter referred to as "PDP"), and more particularly to a display panel itself by integrating an electromagnetic wave shielding material with the PDP. By providing functions such as electromagnetic wave shielding, the display panel can be made lighter and thinner.
The present invention relates to a display panel capable of improving productivity and reducing cost by reducing the number of parts.

[0002]

2. Description of the Related Art PDP utilizing discharge phenomenon
(Plasma display panel) has the following advantages over a liquid crystal display (LCD) and a cathode ray tube (CRT). Therefore, in recent years, OA equipment such as a television, a personal computer, and a word processor, transportation equipment, signboards,
Research and development and commercialization of other display panels such as display panels are being promoted. It uses discharge light and emits light. Since the discharge gap is 0.1 to 0.3 mm, it can be made into a panel type. Color light can be emitted using phosphors. Easy to make large screen panel.

The basic display mechanism of a PDP is to display characters and graphics by selectively discharging and emitting phosphors in a large number of discharge cells separated between two glass plates. For example, the configuration is as shown in FIG. FIG.
In the figure, 21 is a front plate (front glass), 22 is a rear plate (rear glass), 23 is a partition, 24 is a display cell (discharge cell), 25 is an auxiliary cell, 26 is a cathode, 27 is a display anode, and 28 is an auxiliary anode. A red phosphor, a green phosphor or a blue phosphor (not shown) is provided on the inner wall of each display cell 24 in the form of a film, and these phosphors are applied between the electrodes. It emits light when discharged by voltage.

An electromagnetic wave having a frequency of about several kHz to several GHz is generated from the front of the PDP by voltage application, discharge, and light emission, and it is necessary to shield the electromagnetic wave. In order to improve display contrast, it is necessary to prevent reflection of external light on the front surface.

For this reason, conventionally, a transparent plate having a function of shielding electromagnetic waves and the like is arranged on the front surface of the PDP in order to shield electromagnetic waves and the like from the PDP.

Meanwhile, the conventional electromagnetic shielding light transmitting window material has a structure in which a conductive mesh material such as a wire mesh is interposed between transparent substrates such as an acrylic plate or the like.

[0007] The applicant of the present invention has proposed a method of improving the characteristics and workability of such a conventional display panel by interposing a conductive mesh between two transparent substrates and joining them together with a transparent adhesive resin. Proposed display panel (Japanese Patent Application No. 9-25 / 1997)
No. 8380. Hereinafter, it is referred to as “first application”. ).

According to this display panel, it is possible to obtain a clear image with good electromagnetic wave shielding properties and light transparency, and further, by interposing a conductive mesh,
The scattering of the transparent substrate at the time of breakage is also prevented.

[0009]

A transparent panel provided separately from the PDP on the front surface of the PDP has the following disadvantages. Since two plate members are arranged, the structure becomes complicated. Since a transparent substrate such as glass is required for both the PDP and the electromagnetic wave shielding transparent plate, the provision of the PDP and the electromagnetic wave shielding transparent plate increases the thickness and the weight. The number of parts and the number of production steps increase, which leads to an increase in cost.

[0010] PDP includes RGB (Red-Green-
Blue) Phosphor corresponding to each color is applied to each cell, but the luminous efficiency is not always the same. Therefore, when the luminescent color obtained by combining the colors, for example, white is displayed, the type of the selected phosphor is selected. Chromaticity and color temperature are different due to the effects of the above. Complicated processing is required to adjust this to a predetermined design value.

In general, in the case of PDP, since blue light emission is weak, it is necessary to reinforce blue luminance. Further, in order to improve color purity and obtain excellent color reproducibility, a separate color filter is required.

The present invention solves the above-mentioned conventional problems and provides a PD
By integrating the electromagnetic wave shielding material into P, the display panel itself is given a function such as electromagnetic wave shielding properties, and it is possible to increase the productivity and reduce the cost by reducing the weight and thickness of the display panel and reducing the number of parts. It is an object to provide a display panel.

Another object of the present invention is to provide a display panel capable of improving the RGB color purity of a light emitting panel of a PDP or reinforcing a blue luminance to obtain a good white balance without using a color filter. With the goal.

[0014]

The display panel of the present invention comprises:
A display panel comprising: a plasma display panel main body; and an electromagnetic wave shielding material bonded to a front surface of the plasma display panel main body with a transparent adhesive,
The transparent adhesive is a colored transparent adhesive.

In the display panel according to the present invention, the PDP and the transparent substrate are integrated with a transparent adhesive through an electromagnetic wave shielding material, so that the display panel is lightweight and thin, and the productivity is improved by reducing the number of parts. In addition, cost can be reduced.

Moreover, in the present invention, by using a colored transparent adhesive as the transparent adhesive, the color purity of RGB can be improved without impairing the light transmittance, reinforcing the blue luminance or using a color filter. And a clear image can be obtained.

In the present invention, the electromagnetic wave shielding material is preferably made of a conductive mesh. Preferably, a transparent substrate is adhered to the front surface of the electromagnetic wave shielding material with a transparent adhesive.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic sectional view showing an embodiment of the display panel of the present invention.

The display panel 1 comprises a transparent substrate 2 and a PDP.
Between the main body 20 (this PDP main body, the structure shown in FIG. 2 and other general PDP main bodies can be applied), a conductive mesh is formed using bonding intermediate films 4A, 4B, and 4C serving as an adhesive. 3 and the transparent conductive film 5 are laminated and adhered and integrated, the peripheral portion of the conductive mesh 3 protruding from the peripheral portion of the transparent substrate 2 is folded along the peripheral portion of the transparent substrate 2, and the conductive adhesive tape 7 is transparent. It is attached to the substrate 2.

In the present embodiment, the conductive adhesive tape 7 adheres to the entire end face of the transparent substrate 2, the conductive mesh 3, the transparent conductive film 5, and the entire periphery of the laminate of the PDP body 20, and Around the front and back corners of the laminate, the edge of the plate surface of the transparent substrate 2 and the PDP body 20
Also adheres to both edges of the plate surface of the rear plate.

The conductive adhesive tape 7 is, for example, a metal foil 7
A is formed by forming a conductive adhesive layer 7B on one surface of A. As the metal foil 7A of the conductive adhesive tape 7, a foil of copper, silver, nickel, aluminum, stainless steel, or the like having a thickness of about 1 to 100 μm can be used.

The conductive adhesive layer 7B is formed by applying an adhesive in which conductive particles are dispersed to one surface of such a metal foil 7A.

As the adhesive, an epoxy or phenol resin mixed with a curing agent, an acrylic adhesive, a rubber adhesive, a silicone adhesive, or the like can be used.

The conductive particles dispersed in the adhesive include:
As long as it is an electrically good conductor, various conductors can be used. For example, metal powder such as copper, silver, gold, nickel, etc., metal oxide powder such as tin oxide, indium tin oxide, zinc oxide, resin or ceramic powder coated with such metal or metal oxide , Conductive carbon particles and the like can be used. There is no particular limitation on the shape, and any shape such as scaly, dendritic, granular, pellet-like, spherical, star-like, sugar-like (granular with a large number of protrusions), etc. can be taken. .

The amount of the conductive particles is preferably 0.1 to 15% by volume with respect to the adhesive, and the average particle size is preferably 0.1 to 100 μm.

The thickness of the adhesive layer 7B is usually 5 to 1
It is about 00 μm.

The constituent material of the transparent substrate 2 is glass,
Polyester, polyethylene terephthalate (PE
T), polybutylene terephthalate, polyethylene naphthalate, polyether sulfone, polymethyl methacrylate (PMMA), acrylic plate, polycarbonate (PC), polystyrene, triacetate film,
Polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyethylene, ethylene-vinyl acetate copolymer, polyvinyl butyral, metal ion cross-linked ethylene
Methacrylic acid copolymer, polyurethane, cellophane, etc., preferably, glass, PET, PC, PMMA are mentioned.

The thickness of the transparent substrate 2 is appropriately determined according to required characteristics (for example, strength and light weight) depending on the use of the display panel to be obtained, but is usually in the range of 0.1 to 10 mm.

An antireflection film 6 is formed on the surface of the transparent substrate 2. Examples of the antireflection film 6 formed on the surface side of the transparent substrate 2 include a laminated film of a high refractive index transparent film and a low refractive index transparent film, for example, a laminated film having the following laminated structure.

(A) A high-refractive-index transparent film and a low-refractive-index transparent film are laminated in a total of two layers each. (C) a laminate of three layers, one layer each in the order of medium refractive index transparent film / high refractive index transparent film / low refractive index transparent film, and (d) high refractive index transparent film / low refractive index A transparent film in which three layers are alternately laminated in a total of six layers. The high refractive index transparent film is made of ITO (tin indium oxide), ZnO, Al-doped ZnO, TiO ₂ ,
A thin film having a refractive index of 1.8 or more, such as SnO ₂ or ZrO, preferably a transparent conductive thin film can be formed. Also,
As the low-refractive-index transparent film, a thin film made of a low-refractive-index material having a refractive index of 1.6 or less, such as SiO ₂ , MgF ₂ , or Al ₂ O _3, can be formed. These film thicknesses differ depending on the film configuration, film type, and center wavelength in order to reduce the reflectance in the visible light region due to light interference. However, in the case of a four-layer structure, the first layer on the transparent substrate side (high refractive index) 5 to 50 nm for the second layer (transparent film with low refractive index), 50 to 100 nm for the third layer (transparent film with high refractive index), and 50 for the fourth layer (transparent film with low refractive index). It is formed with a thickness of about 150 nm.

Further, an anti-contamination film may be further formed on the anti-reflection film 6 so as to enhance the surface's anti-staining property. In this case, as the contamination prevention film, a film thickness of 1 to 1000 nm made of a fluorine-based thin film, a silicon-based thin film, or the like.
A thin film of the order is preferred.

The transparent substrate 2 on the front surface side may be further subjected to a hard coat process using a silicon-based material or the like, or an anti-glare process in which a light scattering material is kneaded in the hard coat layer.

The conductive mesh 3 has a wire diameter of 1 μm to 1 mm made of metal fibers and / or metal-coated organic fibers.
Those having an aperture ratio of 40 to 90% are preferred. In this conductive mesh, if the wire diameter exceeds 1 mm, the aperture ratio is reduced or the electromagnetic wave shielding property is reduced, so that the compatibility cannot be achieved. If it is less than 1 μm, the strength as a mesh decreases,
Handling becomes very difficult. If the aperture ratio exceeds 90%, it is difficult to maintain the shape as a mesh,
If it is less than 40%, the light transmittance is low, and the amount of light from the display is reduced. More preferred wire diameter is 10-5
00 μm, and the aperture ratio is 60 to 90%.

The aperture ratio of the conductive mesh means the ratio of the area occupied by the openings in the projected area of the conductive mesh.

The metals of the metal fibers and the metal-coated organic fibers constituting the conductive mesh include copper, stainless steel, aluminum, nickel, titanium, tungsten, tin, lead, and the like.
Iron, silver, chromium, carbon or an alloy thereof, preferably copper, stainless steel, or aluminum is used.

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

In the present invention, it is particularly preferable to use a conductive mesh made of highly tough metal-coated organic fibers since the conductive mesh is turned over at the edges.

As the transparent conductive film 5, a resin film in which conductive particles are dispersed, or a base film having a transparent conductive layer formed thereon can be used.

The conductive particles to be dispersed in the film are not particularly limited as long as they have conductivity, and examples thereof include the following. (i) Carbon particles or powder (ii) Nickel, indium, chromium, gold, vanadium, tin, cadmium, silver, platinum, aluminum, copper, titanium, cobalt, lead and other metals or alloys or conductive oxides thereof Particles or powder (iii) Plastic particles such as polystyrene, polyethylene, etc. with a coating layer of the conductive material of (i) or (ii) formed on the surface.If the particle size of these conductive particles is excessively large, The thickness is preferably 0.5 mm or less because it affects the transmittance and the thickness of the transparent conductive film 5. The preferred particle size of the conductive particles is 0.01 to 0.5 mm.

When the mixing ratio of the conductive particles in the transparent conductive film 5 is too large, the light transmittance is impaired, and when the mixing ratio is too small, the electromagnetic wave shielding property is insufficient. 0.1 to 50 by weight
% By weight, especially 0.1 to 20% by weight, especially 0.5 to 2%
It is preferred to be about 0% by weight.

The color and gloss of the conductive particles are appropriately selected according to the purpose. However, for use as a filter for a display panel, a dark and matte color such as black or brown is preferable. In this case, by adjusting the light transmittance of the filter appropriately by the conductive particles, there is also an effect that the screen becomes easy to see.

Examples of the base film having a transparent conductive layer formed thereon include a transparent conductive layer formed of tin indium oxide, zinc aluminum oxide, or the like by vapor deposition, sputtering, ion plating, CVD, or the like. . In this case, if the thickness of the transparent conductive layer is less than 0.01 μm, the thickness of the conductive layer for shielding electromagnetic waves is too thin,
Sufficient electromagnetic wave shielding properties cannot be obtained, and if it exceeds 5 μm, light transmittance may be impaired.

As the matrix resin of the transparent conductive film 5 or the resin of the base film, polyester, polyethylene terephthalate (PET), polybutylene terephthalate, polymethyl methacrylate (PM
MA), acrylic plate, polycarbonate (PC), polystyrene, triacetate film, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyethylene, ethylene-vinyl acetate copolymer, polyvinyl butyral, metal ion-crosslinked ethylene-methacrylic acid copolymer , Polyurethane, cellophane, etc., preferably PE
T, PC, and PMMA.

The thickness of such a transparent conductive film 5 is usually about 1 μm to 5 mm.

In the present invention, a colored transparent resin is used as an adhesive resin for bonding the transparent substrate 2, the conductive mesh 3, the transparent conductive film 5, and the PDP body 20. The bonding intermediate films 4A, 4B, and 4C do not need to be made of a colored transparent resin. If at least one is made of a colored transparent resin, the other is made of a colorless transparent resin. May be.

As such a colored transparent resin, a colored resin obtained by adding a pigment to a transparent resin can be used.

The pigment is not particularly limited, and a general colorant for plastics can be used. Examples thereof include yellow iron oxide, graphite, cadmium yellow, fast yellow, disazo yellow, molybdate orange, and pyrazolone. Orange, red, cadmium red, lake red C, brilliant carmine 6B, quinacridone red, manganese violet, methyl violet lake, dioxazine violet, ultramarine, navy blue, cobalt blue, Victoria blue lake, phthalocyanine blue, chrome green, chromium oxide, phthalocyanine One kind of green or the like can be used alone or as a mixture of two or more kinds.

As described above, in the light emitting panel of PDP, blue emission is weak, and it is desired to enhance the blue luminance, and in order to improve the color purity, in the present invention, ultramarine, navy blue, cobalt blue, Victoria blue lake, One or more blue pigments such as phthalocyanine blue or a combination with a violet pigment such as manganese violet, methyl violet lake, dioxazine violet or the like is used to color blue. Alternatively, a pigment that improves the color purity of various RGB, a green pigment such as chrome green, chromium oxide, and phthalocyanine green, and a violet or blue pigment are mixed and blended. It is preferable to adopt such a method.

The amount of the pigment is adjusted according to EVA in order to improve the characteristics such as contrast without impairing the transparency.
0.001 to 100 parts by weight of matrix resin such as
Preferably, the amount is from 10 to 10 parts by weight.

As the transparent adhesive resin, a transparent and elastic resin, for example, a resin which is usually used as an adhesive for laminated glass is preferable. Specifically, an ethylene-vinyl acetate copolymer, Ethylene-methyl acrylate copolymer, ethylene- (meth) acrylic acid copolymer, ethylene- (meth) ethyl acrylate copolymer, ethylene-methyl (meth) acrylate copolymer, metal ion-crosslinked ethylene- ( (Meth) acrylic acid copolymer, partially saponified ethylene-vinyl acetate copolymer, carboxylated ethylene-
Examples include ethylene-based copolymers such as vinyl acetate copolymer, ethylene- (meth) acryl-maleic anhydride copolymer, and ethylene-vinyl acetate- (meth) acrylate copolymer (in addition, “(meth) "Acrylic" means "acrylic or methacrylic.") The most balanced and easy to use in terms of performance is the ethylene-vinyl acetate copolymer (E
VA). In addition, from the viewpoints of impact resistance, penetration resistance, adhesiveness, transparency, etc., P used in laminated glass for automobiles is used.
VB resins are also suitable.

The EVA has a vinyl acetate content of 5 to 5
0% by weight, preferably 15-40% by weight is used. If the vinyl acetate content is less than 5% by weight, there is a problem in weather resistance and transparency, and if it exceeds 40% by weight, mechanical properties are remarkably deteriorated, film formation becomes difficult, and film mutual blocking occurs. .

When crosslinking by heating, an organic peroxide is suitable as the crosslinking agent, and is selected in consideration of sheet processing temperature, crosslinking temperature, storage stability and the like. Usable peroxides include, for example, 2,5-dimethylhexane-2,5-dihydroperoxide; 2,5-dimethyl-2,5-
Di (t-butylperoxy) hexane-3; di-t-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; 1,1- Bis (t-butylperoxy) -3,
3,5-trimethylcyclohexane; t-butylperoxybenzoate; benzoyl peroxide; tert-butylperoxyacetate; 2,5-dimethyl-2,5
-Bis (tert-butylperoxy) hexyne-3; 1,1
-Bis (tert-butylperoxy) -3,3,5-trimethylcyclohexane; 1,1-bis (tert-butylperoxy) cyclohexane; methyl ethyl ketone peroxide; 2,5-dimethylhexyl-2,5-bisper Oxybenzoate; tertiary butyl hydroperoxide; p-menthane hydroperoxide; p-chlorobenzoyl peroxide; tertiary butyl peroxyisobutyrate; hydroxyheptyl peroxide; chlorohexanone peroxide. These peroxides are used singly or as a mixture of two or more, and are usually used in an amount of 5 parts by weight or less, preferably 0.5 to 5.0 parts by weight, based on 100 parts by weight of EVA. .

The organic peroxide is usually extruded to EVA,
It is kneaded by 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.

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

More specifically, polyfunctional esters such as acrylic or methacrylic esters such as trimethylolpropane, pentaerythritol and glycerin, triallyl cyanurate, triallyl isocyanurate, diallyl phthalate, diallyl isophthalate, and maleic And allyl group-containing compounds such as diallyl acid. These compounds may be used alone or as a mixture of two or more.
0.1 to 2 parts by weight, preferably 0.5 to 2 parts by weight
5 parts by weight are used.

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

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-triene Nitroaniline, 1,2-benzanthraquinone, 3-methyl-1,3-diaza-
1,9-benzanthrone and the like;
Species can be used alone or in combination of two or more.

In this case, a silane coupling agent is used in combination as an adhesion promoter. Examples of the silane coupling agent include vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, γ-glycidoxypropyltrimethoxysilane,
γ-glycidoxypropyltriethoxysilane, β-
(3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-chloropropylmethoxysilane, vinyltrichlorosilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N
-Β (aminoethyl) -γ-aminopropyltrimethoxysilane and the like.

These silane coupling agents are usually EV
One or more kinds are mixed and used at a ratio of 0.001 to 10 parts by weight, preferably 0.001 to 5 parts by weight with respect to 100 parts by weight of A.

On the other hand, the PVB resin contains 70 to 95% by weight of a polyvinyl acetal unit and 1 to 50% by weight of a polyvinyl acetate unit.
It is preferably 15% by weight and the average degree of polymerization is 200 to 3000, preferably 300 to 2500, and the PVB resin is used as a resin composition containing a plasticizer.

Examples of the plasticizer for the PVB resin composition include organic plasticizers such as monobasic acid esters and polybasic acid esters, and phosphoric acid plasticizers.

The monobasic acid esters include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptanoic acid, n-octylic acid, 2-ethylhexylic acid, pelargonic acid (n-
Esters obtained by the reaction of an organic acid such as nonylic acid) and decylic acid with triethylene glycol, and more preferably triethylene-di-2-ethylbutyrate and triethylene glycol-di-2-ethylhexo. Ethates, triethylene glycol-di-capronate, triethylene glycol-di-n-octoate and the like. Note that an ester of the above organic acid with tetraethylene glycol or tripropylene glycol can also be used.

As the polybasic acid ester-based plasticizer, for example, an ester of an organic acid such as adipic acid, sebacic acid, azelaic acid and a linear or branched alcohol having 4 to 8 carbon atoms is preferable, and more preferably. , Dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate and the like.

Examples of the phosphoric acid plasticizer include tributoxyethyl phosphate, isodecylphenyl phosphate, triisopropyl phosphate and the like.

In the PVB resin composition, if the amount of the plasticizer is small, the film-forming property is reduced, and if the amount is large, the durability at the time of heat resistance is impaired. Therefore, the plasticizer is added in an amount of 5 to 100 parts by weight of polyvinyl butyral resin. 50 parts by weight, preferably 10-4
0 parts by weight.

The resin composition for an adhesive interlayer according to the present invention further comprises a small amount of a stabilizer, an antioxidant, an ultraviolet absorber, an infrared absorber, an antioxidant, a paint processing aid, etc. It may contain a small amount of filler such as carbon black, hydrophobic silica and calcium carbonate depending on the case.

As means for improving the adhesiveness, means such as corona discharge treatment, low-temperature plasma treatment, electron beam irradiation, and ultraviolet light irradiation on the surface of the adhesive intermediate film formed into a sheet are also effective.

The adhesive interlayer according to the present invention is, for example, E
It is manufactured by mixing VA or PVB with the above-mentioned additives, kneading with an extruder, a roll, or the like, and then forming a sheet into a predetermined shape by a film forming method such as a calendar, a roll, T-die extrusion, or inflation. . During film formation, embossing is applied to prevent blocking and facilitate degassing during pressure bonding with the transparent substrate or the front plate of the PDP body.

The display panel 1 shown in FIG. 1 has, for example, a sheet-formed adhesive intermediate film 4A, 4B,
4C, a conductive mesh 3 and a transparent conductive film 5 sandwiched between the bonding intermediate films 4A, 4B and 4C are interposed between the transparent substrate 2 and the PDP body 20,
After deaeration under reduced pressure and heating and pre-compression bonding, the adhesive layer is hardened by heating or light irradiation and integrated to easily produce the adhesive layer.

The bonding intermediate films 4A, 4B and 4C are
1 μm so that the thickness of the adhesive layer does not become excessively thick
It is molded to a thickness of 1 mm. The conductive mesh 3 has a larger area than that of the transparent substrate 2 so that its peripheral portion protrudes from the peripheral portion of the transparent substrate 2. It is preferable that the edge of the transparent substrate 2 has such a size that it goes around the front side of the transparent substrate 2 and the width of the edge of the front side of the transparent substrate 2 is about 3 to 20 mm.

After integrating the transparent substrate 2, the conductive mesh 3, the transparent conductive film 5 and the PDP body 20, the protruding portion of the periphery of the conductive mesh 3 is folded back, and the conductive adhesive tape 7 is placed around the laminate. Then, the folded portion is fastened, and is adhered and fixed by, for example, applying heat and pressure in accordance with the method of curing the conductive adhesive tape 7 used.

Note that the transparent conductive film 5 also
In order to secure conduction with the conductive adhesive tape 7, a conductive tape is provided on the periphery of the transparent conductive film 5 so as to protrude from the laminate, and the protruding portion of the conductive tape is fixed by the conductive adhesive tape 7. It is preferable to provide a conductive portion by attaching it to a side portion of the laminate.

The display panel 1 to which the conductive adhesive tape 7 has been attached in this manner can be very simply and easily incorporated into the housing simply by fitting it into the housing.
Good conduction between the conductive mesh 3 and the transparent conductive mesh 5 and the housing via the conductive adhesive tape 7 can be uniformly achieved in the outer peripheral direction. Therefore, a good electromagnetic wave shielding effect can be obtained.

The display panel shown in FIG. 1 is an example of the display panel of the present invention, and the present invention is not limited to the illustrated one. For example, the conductive mesh 3 is formed so as to protrude from the transparent substrate 2 at the entire peripheral edge thereof and be turned back, and besides the transparent substrate 2 only at two opposing side edges.
You may make it protrude and turn it back.

Although a transparent conductive film is not necessarily required, a desired electromagnetic wave shielding property and light transmittance can be obtained by using a conductive mesh and a transparent conductive film in combination, and the moire phenomenon can be obtained. Etc. can be prevented and a clear image can be obtained. Figure 1 shows a transparent conductive film.
As shown in (2), it may be arranged not between the conductive mesh 3 and the PDP body 20 but between the conductive mesh 3 and the transparent substrate 2. In addition, instead of the transparent conductive film, a transparent conductive layer may be directly formed on the bonding surface side of the transparent substrate 2 or the front plate of the PDP body 20.

Further, in the display panel of the present invention, a heat ray cut film may be further provided between the transparent substrate 2 and the PDP main body 20, and in this case, the heat ray cut film is formed of zinc oxide on a base film. Or a thin film coated with a heat ray such as a silver thin film can be used. As the base film, preferably, PET, PC, P
A film made of MMA or the like can be used. This film has a thickness of 10 μm for ensuring handleability and durability without excessively increasing the thickness of the obtained display panel.
It is preferable to set it to about m to 20 mm. The thickness of the heat ray cut coat formed on the base film is usually about 500 to 5000 °.

[0078]

As described above in detail, according to the display panel of the present invention, by integrating an electromagnetic wave shielding material with the PDP, the display panel itself is given a function such as an electromagnetic wave shielding property, and the display panel has a light weight. It is possible to improve productivity and reduce cost by reducing the thickness and the number of parts.
In addition, malfunction of the remote controller can be prevented.

In addition, in the display panel of the present invention, by using a colored and transparent adhesive, it is possible to enhance the blue luminance without impairing the light transmittance or to improve the color purity of RGB without using a color filter. And a good white balance can be obtained.

In particular, when the PDP main body and the transparent substrate are bonded and integrated via a conductive mesh, the fragments are prevented from being scattered when the display panel is damaged by an impact or the like, and the safety is enhanced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a display panel of the present invention.

FIG. 2 is a partially cutaway perspective view showing a configuration of a general PDP.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display panel 2 Transparent substrate 3 Conductive mesh 4A, 4B, 4C Intermediate film 5 Transparent conductive film 6 Antireflection film 7 Conductive adhesive tape 7A Metal foil 7B Adhesive layer 20 PDP main body 21 Front plate 22 Back plate 23 Partition 24 Display Cell 25 auxiliary cell 26 cathode 27 display anode 28 auxiliary anode

Claims (3)

[Claims] 1. A display panel comprising: a plasma display panel main body; and an electromagnetic wave shielding material bonded to a front surface of the plasma display panel main body with a transparent adhesive, wherein the transparent adhesive is a colored transparent adhesive. A display panel, characterized in that: 2. The display panel according to claim 1, wherein the electromagnetic wave shielding material is made of a conductive mesh. 3. The display panel according to claim 1, wherein a transparent substrate is adhered to a front surface of the electromagnetic wave shielding material by a transparent adhesive.