JP2001331116A - Display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display panel, such as a plasma display panel, imparted with functions, such as electromagnetic shieldability, to the display panel itself by integrating electromagnetic shielding materials. SOLUTION: A transparent film 2 having conductive patterns 3 is adhered to the flank of a plasma display panel body 20 by a transparent adhesive 4A. The conductive patterns 3 are like mesh of <=50 μm in line width and >=75% in aperture ratio and is formed by gaseous phase plating or liquid phase plating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel such as a plasma display panel (hereinafter referred to as "PDP"), and more particularly, to a display panel itself having an electromagnetic shielding function by integrating an electromagnetic shielding material. The present invention relates to a display panel, which is capable of improving the productivity and reducing the cost by reducing the weight and thickness of the display panel and reducing the number of parts.

[0002]

2. Description of the Related Art PDP (plasm
A display panel has the following advantages over a liquid crystal display (LCD) and a cathode ray tube (CRT).
Research and development and commercialization of display panels such as OA equipment such as word processors, traffic equipment, signboards, and other display boards 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.
, 21 is a front panel (front glass), 22 is a rear panel (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 it is discharged by the applied 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.

In the case where a transparent plate separate from the PDP is provided on the front surface of the PDP, there are 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.

By the way, as the electromagnetic wave shielding material of the ordinary electromagnetic wave shielding light transmitting window material, a line width of 10 to 500 μm is used.
A conductive mesh having an aperture ratio of less than 75% with a mesh size of about 5 to 500 mesh is used, but in the case of a conventional conductive mesh, in general, a conductive fiber having a large line width is not suitable for the mesh. The coarser the line, the narrower the line width, the finer the eyes. This is a fiber with a large line width.
Although it is possible to form a coarse mesh, it is very difficult to form a coarse mesh with fibers having a small line width.

For this reason, in a conventional display panel using such a conductive mesh, even if the display panel has good light transmittance,
It is about 70% at most, and has a drawback that good light transmittance cannot be obtained.

Further, in the conventional conductive mesh, there is a problem that moire (interference fringes) is easily generated in relation to the pixel pitch of the light emitting panel.

The present applicant has solved the above conventional problems,
By integrating the electromagnetic wave shielding material into the PDP, the display panel itself is given functions such as electromagnetic wave shielding, and the display panel can be made lighter, thinner, and the number of parts can be improved to improve productivity and reduce costs. As a display panel,
A display panel comprising: a plasma display panel main body; and a transparent substrate adhered to a front surface of the plasma display panel main body with a transparent adhesive. A display panel has been proposed in which a conductive layer formed by pattern printing in a grid pattern having a width of 200 μm or less and an aperture ratio of 75% or more is formed (Japanese Patent Laid-Open No. 11-204045).

In this display panel, since the PDP and the transparent substrate on which the conductive layer is formed are integrated with a transparent adhesive, the display panel is made lighter, thinner, and has improved productivity and cost by reducing the number of parts. Can be reduced.

Moreover, according to the pattern printing, a conductive layer having a desired pattern shape can be formed.
The degree of freedom of line width, spacing and mesh shape is much larger than that of the conductive mesh, and it can be easily formed even with a conductive layer of a fine line with a line width of 200 μm or less and an aperture ratio of 75% or more and a high aperture ratio. It is. If the conductive layer is such a fine line and coarse, a good light transmittance can be obtained,
Moire phenomenon can be prevented.

The aperture ratio is defined as the line width of the mesh and 1
It is calculated from the number of lines existing in inch width.

[0014]

As the above-mentioned conductive paint, one obtained by dispersing conductive fine particles in a binder (ink medium) is used, and the conductive fine particles are dispersed in the conductive paint. In order to maintain the state, it is necessary to make the viscosity of the conductive paint sufficiently high. For this reason, the line width of the printed pattern made of the conductive paint cannot be significantly reduced, and the aperture ratio cannot be significantly increased.

An object of the present invention is to provide a display panel in which an electromagnetic wave shielding material having a mesh-shaped conductive pattern having a sufficiently small line width and a remarkably high aperture ratio is arranged on the front surface of the display panel. And

[0016]

The display panel of the present invention comprises:
A display panel comprising: a display panel main body; a transparent film disposed on a front surface of the display panel main body; and a conductive pattern formed on the transparent film, wherein the conductive pattern is formed by vapor-phase plating. Or a mesh-like pattern comprising a liquid phase plating layer.

Since this display panel includes a PDP and a transparent film on which a conductive pattern is formed, the weight and thickness of the display panel can be reduced, the number of components can be reduced, and productivity can be improved and cost can be reduced. .

The conductive pattern according to the present invention includes, for example,
On the transparent film surface, dots are formed by a substance soluble in a solvent, and a conductive material layer made of a conductive material insoluble in the solvent is formed on the film surface by vapor phase plating or liquid phase plating. It can be manufactured by contacting a film surface with the solvent to remove the dots and the conductive material layer on the dots.

According to such a manufacturing method, the conductive fine particles are not dispersed in the material soluble in the solvent,
Dots can be printed and formed with a low-viscosity material. For this reason, fine and minute printing can be performed so as to significantly reduce the interval between dots. Since the narrow region between the dots is a region where the conductive material remains to form a mesh-shaped conductive pattern later, an extremely thin conductive mesh pattern can be formed with high precision. By reducing the line width, the aperture ratio of the mesh can be increased.

In the present invention, the conductive pattern is preferably a conductive mesh pattern having a line width of 50 μm or less and an aperture ratio of 75% or more. Light transmittance can be obtained, and the moire phenomenon can be prevented.

[0021]

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.

This display panel 1 has a transparent film 2 having a conductive pattern 3 formed on an adhesive surface side and a PDP body 20 (the PDP body shown in FIG. 3 and other various PDP bodies are applied. The transparent conductive film 5 is laminated and bonded and integrated using the bonding intermediate films 4A and 4B serving as the adhesive during the process.

The present invention has a great feature in the point of the transparent film having the conductive pattern. First, the structure of the film with the conductive pattern and the manufacturing method thereof will be described with reference to FIG.

FIG. 2 is a sectional view showing an example of a method for producing a film with a conductive pattern according to the present invention.
The dots 12 are printed on the transparent film 11 using a material that is soluble in a solvent such as water. Next, as shown in the figure, the conductive material layer 13 is formed so as to cover all the exposed surfaces of the film on and between the dots 12 of the film 11.
To form Next, the film 11 is washed with a solvent such as water. At this time, if necessary, a dissolution promoting means such as ultrasonic irradiation or rubbing with a brush or sponge may be used in combination.

As a result, as shown in FIG.
2 is dissolved, and the conductive material on the dots 12 is
Removed from 1 Then, the conductive pattern 14 made of the conductive material formed in the region between the dots remains on the film 11. Since the conductive pattern 14 occupies the area between the dots 11, it has a mesh shape as a whole.

Therefore, by reducing the gap between the dots 12, a mesh-shaped conductive pattern 14 having a small line width is formed. In addition, by increasing the area of each dot 2, a mesh-shaped conductive pattern 14 having a large aperture ratio is formed. The printing material soluble in water or the like for forming the dots 12 does not need to disperse fine particles, and a low-viscosity material is sufficient. With this low-viscosity printing material, dots can be printed in a fine dot pattern.

After the above-mentioned steps, a final transparent washing (rinse) and drying are performed as required, whereby an electromagnetic wave shielding light transmitting window material is obtained.

Next, preferred examples of each of the above materials will be described.

As the transparent film 11, 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 the transparent film varies depending on the use of the light-transmitting window material for shielding electromagnetic waves, but is usually about 1 μm to 5 mm.

The dots formed on the film 11 are preferably formed by printing. As a printing material, a solution of a material that is soluble in a solvent that removes dots is used. As a solvent for removing the dots, an organic solvent may be used, but water is preferable because it is inexpensive and has an adverse effect on the environment. Water is normal water,
It may be an aqueous solution containing an acid, an alkali or a surfactant. The printing material may be mixed with a pigment or a dye in order to make it easier to confirm the printing condition.

In view of the fact that the solvent is water,
As the dot forming material, a water-soluble polymer material is preferable, and specifically, polyvinyl alcohol and the like are suitable.

The dots 12 are printed so that the film exposed area between them is meshed. Preferably, printing is performed so that the line width of the exposed film area is 50 μm or less. As a printing method, gravure printing, screen printing, inkjet printing, and electrostatic printing are preferable, but gravure printing is preferable for thinning.

The nature of the dot is a mystery such as a circle, an ellipse, and a square, but is preferably a square, particularly a square.

The printing thickness of the dots is not particularly limited, but is usually about 0.1 to 5 μm.

After printing the dots, they are preferably dried, and then the conductive material layer 13 is formed. This material includes aluminum, nickel, indium, chromium, gold, vanadium, tin, cadmium, silver, platinum, copper, titanium,
Metals or alloys such as cobalt and lead or conductive oxides such as ITO are suitable.

If the thickness of the conductive material layer 13 is too small, the electromagnetic wave shielding performance is insufficient, which is not preferable. If the thickness is too large, the thickness of the obtained electromagnetic wave shielding light transmitting window material is affected and the viewing angle is reduced. Because it narrows,
The thickness is preferably about 0.5 to 100 μm.

Examples of the method of forming the conductive material layer 13 include vapor phase plating methods such as sputtering, ion plating, vacuum deposition, and chemical vapor deposition, liquid phase plating (electrolytic plating, electroless plating, etc.), printing, coating, and the like. However, vapor phase plating (sputtering, ion plating,
Vacuum vapor deposition, chemical vapor deposition) or liquid phase plating are preferred.

After the formation of the conductive material layer 13, as described above, the dots 12 are removed using a solvent, preferably water, and dried as necessary to obtain an electromagnetic wave shielding light transmitting window material.

An anti-reflection film 6 is formed on a plate surface on the front side of the transparent film 2. As the antireflection film 6 formed on the surface side of the transparent film 2, a single-layer film of the following (a) or a laminated film of a high refractive index transparent film and a low refractive index transparent film, for example, the following (b) ) To (e). (A) One layer of a transparent film having a lower refractive index than the transparent substrate. (B) One layer of a high refractive index transparent film and one layer of a low refractive index transparent film. (C) High refractive index transparent. A film obtained by alternately laminating two films and two low-refractive-index transparent films in total of two layers (d) One layer in the order of a medium-refractive-index transparent film / a high-refractive-index transparent film / a low-refractive-index transparent film, for a total of three layers Laminated layers (e) Laminated layers of three layers alternately in the order of high-refractive-index transparent film / low-refractive-index transparent film, for a total of six layers. The high-refractive-index transparent film is ITO (tin indium oxide). Or 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,
SiO ₂ , MgF ₂ , Al ₂ O 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 _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-contamination 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 front side of the transparent film 2 may be further subjected to a hard coat treatment with a silicon-based material or the like, or an anti-glare treatment in which a light scattering material is kneaded in the hard coat layer.

In the present embodiment, the aperture of the conductive pattern 3 is increased to improve the light transmittance.
The transparent conductive film 5 is further interposed between the transparent film 2 and the PDP main body 20 to compensate for the shortage of the electromagnetic wave shielding property by the conductive pattern 3.

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) A coating layer of the conductive material of (i) or (ii) above formed on the surface of plastic particles such as polystyrene or polyethylene.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.

If the mixing ratio of the conductive particles in the transparent conductive film 5 is too large, the light transmittance is impaired, and if 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, from the use as a filter of a display panel, dark and matte ones such as black and brown are preferred. 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 formed 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.

The matrix resin of the transparent conductive film 5 or the resin of the base film includes polyester, polyethylene terephthalate (PET), polybutylene terephthalate, and 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.

As shown in FIG. 1, an excellent electromagnetic wave shielding property can be obtained by using the transparent conductive film 5 and the conductive pattern 3 together.

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

In the present invention, the transparent film 2 having the conductive pattern 3 formed thereon, the transparent conductive film 5 and the PDP
Examples of the adhesive resin for bonding the main body 20 include an ethylene-vinyl acetate copolymer, an ethylene-methyl acrylate copolymer, an ethylene- (meth) acrylic acid copolymer, an ethylene- (meth) acrylate copolymer, Ethylene-methyl (meth) acrylate copolymer, metal ion crosslinked ethylene- (meth) acrylic acid copolymer, partially saponified ethylene
Ethylene copolymers such as vinyl acetate copolymer, carboxylated ethylene-vinyl acetate copolymer, ethylene- (meth) acrylic-maleic anhydride copolymer, and ethylene-vinyl acetate- (meth) acrylate copolymer (“(Meth) acryl” indicates “acryl or methacryl”). In addition, polyvinyl butyral (P
VB) Resins, epoxy resins, acrylic resins, phenolic resins, silicone resins, polyester resins, urethane resins and the like can also be used.

When an attempt is made to integrate the PDP main body with a transparent film or the like, if the PDP main body is damaged by an impact or the like, fragments may be scattered if the PDP main body is bonded by using an ordinary adhesive. . Therefore, in order to reliably prevent the fragments from being scattered when the display panel is damaged by impact or the like, and to enhance safety, in the present invention, it is preferable to use a transparent and elastic resin as the adhesive resin. As such a transparent adhesive resin, those usually used as an adhesive for laminated glass can be mentioned. In particular, ethylene-vinyl acetate copolymer (EVA) is most balanced in terms of performance and easy to use. It is. Further, PVB resins used in laminated glass for automobiles are also suitable in terms of impact resistance, penetration resistance, adhesiveness, transparency and the like.

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 a proportion 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 has a polyvinyl acetal unit content of 70 to 95% by weight and a polyvinyl acetate unit content of 1 to 95% by weight.
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 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 phosphate 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 the polyvinyl butyral resin. 50 parts by weight, preferably 10-4
0 parts by weight.

The resin composition of the adhesive interlayer according to the present invention further comprises a stabilizer, an antioxidant, an ultraviolet absorber, an infrared absorber, an antioxidant, a paint processing aid,
It may contain a small amount of a coloring agent and the like, and in some cases, may contain a small amount of a filler such as carbon black, hydrophobic silica and calcium carbonate.

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 intermediate film for bonding is, for example, EVA or PV.
B is mixed with the above-mentioned additive, kneaded with an extruder, a roll, or the like, and then formed into a sheet into a predetermined shape by a film forming method such as calender, 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 uses, for example, the bonding intermediate films 4A and 4B formed as described above, and sandwiches the transparent conductive film 5 between the bonding intermediate films 4A and 4B. After being preliminarily pressed between the transparent film 2 on which the conductive pattern 3 is formed and the PDP main body 20 by degassing under reduced pressure and heating, the adhesive layer is heated or irradiated with light. It can be easily manufactured by curing and integrating.

The bonding intermediate films 4A and 4B are formed to have a thickness of 1 μm to 1 m so that the thickness of the bonding layer does not become excessively large.
m thickness.

After the transparent film 2, the transparent conductive film 5 and the PDP body 20 have been integrated, the conductive adhesive tape 7 is wrapped around the laminate to be fastened, and the used method of curing the conductive adhesive tape 7 Adhesion and fixation are performed, for example, by heating and pressing in accordance with the method.

In this embodiment, the conductive adhesive tape 7 is composed of the transparent film 2, the transparent conductive film 5, and the PDP main body 2.
In the entire periphery of the laminate of No. 0, the adhesive adheres to the entire end surface and goes around the front and back corners of the laminate, and the edge of the plate surface of the transparent film 2 and the end of the plate surface of the back plate of the PDP body 20. It is stuck so as to adhere to both edges.

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.

As the conductive particles dispersed in the adhesive,
As long as it is an electrically good conductor, various conductors can be used. For example, metal powder such as copper, silver, nickel, tin oxide, indium tin oxide, metal oxide powder such as zinc oxide, resin or ceramic powder coated with such metal or metal oxide, etc. 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 compounding amount of the conductive particles is preferably 0.1 to 15% by volume based on 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.

In order to ensure conduction between the conductive adhesive tape 7 and the conductive pattern 3 and the transparent conductive film 5, the periphery of the transparent film 2 on which the conductive pattern 3 is formed and the transparent conductive film 5 It is preferable to form a conductive portion by attaching a conductive tape or the like to the periphery so as to protrude from the periphery, and attaching the conductive tape to the side of the laminate with the conductive adhesive tape 7. .

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 pattern 3 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.

[0086]

As described in detail above, according to the display panel of the present invention, the display panel itself is integrated with the transparent film on which the conductive pattern is formed by integrating the display panel body such as a PDP with the electromagnetic wave shielding property. And other functions,
It is possible to improve the productivity and reduce the cost by reducing the weight and thickness of the display panel and reducing the number of parts. In addition, malfunction of the remote controller can be prevented.

Further, by using a transparent film having a grid-like conductive pattern with a thin line width and a coarse opening, a desired electromagnetic wave shielding property and good light transmittance can be obtained. A clear image can be obtained by preventing the phenomenon and the like.

[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 an explanatory view of a method for producing a film with a conductive pattern used for a display panel of the present invention.

FIG. 3 is a partially cutaway perspective view showing a configuration of a general PDP.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display panel 2 Transparent film 3 Conductive pattern 4A, 4B Intermediate film 5 Transparent conductive film 6 Antireflection film 7 Conductive adhesive tape 7A Metal foil 7B Adhesive layer 11 Film 12 Dot 13 Conductive material layer 14 Conductive pattern 20 PDP main body Reference Signs List 21 front plate 22 back plate 23 partition wall 24 display cell 25 auxiliary cell 26 cathode 27 display anode 28 auxiliary anode

Claims (7)

[Claims] 1. A display panel comprising: a display panel main body; a transparent film disposed on a front surface of the display panel main body; and a conductive pattern formed on the transparent film. Is a mesh-like pattern comprising a vapor phase plating layer or a liquid phase plating layer. 2. The display panel according to claim 1, wherein the pattern has a line width of 50 μm or less. 3. The display panel according to claim 2, wherein the pattern has a line width of 10 to 30 μm. 4. The display panel according to claim 1, wherein an aperture ratio of the mesh pattern is 75% or more. 5. The method according to claim 4, wherein the aperture ratio is 75 to 85.
% Display panel. 6. The display panel according to claim 1, wherein the conductive pattern has a thickness of 10 to 50 μm. 7. The display panel according to claim 1, wherein the display panel body is a plasma display.