KR20090125393A - Black paste composition having conductivity property, filter for shielding electromagnetic interference and display device comprising the same - Google Patents

Abstract

PURPOSE: A black conductive paste composition is provided to be hardened at a low temperature when applied to an offset process, to improve electric resistance and adhesive force while not degrading printing characteristic, and to form a filter shielding electromagnetic wave. CONSTITUTION: A black conductive paste composition comprises a polymer resin and monomer or oligomer 5-15 parts by weight, solvent 5-15 parts by weight, glass powder 1-10 parts by weight, conductive material 50-90 parts by weight and black pigment 1-10 parts by weight. The conductive material comprises conductive metal powder with average particle diameter of 0.5-5 micron and conductive particles with average particle diameter of 0.02-0.09 micron.

Description

Black conductive paste composition, electromagnetic wave shielding filter and display device including the same {BLACK PASTE COMPOSITION HAVING CONDUCTIVITY PROPERTY, FILTER FOR SHIELDING ELECTROMAGNETIC INTERFERENCE AND DISPLAY DEVICE COMPRISING THE SAME}

The present invention is applied to the electromagnetic wave shielding filter for display devices such as plasma display panel, it is possible to low-temperature firing, excellent adhesion and electrical resistance to improve the quality of the pattern, printability and continuous process, plasma display appearance The present invention relates to a black conductive paste composition capable of preventing the deterioration of properties, a filter for shielding electromagnetic waves using the same, and a display device having the same.

Recently, various kinds of display devices have been developed. For example, a plasma display device (PDP), a liquid crystal display device (LCD), an organic light emission display device (OLED), and the like are being developed. Such display devices are used for many products that require image display because they are thin and light in weight.

Meanwhile, electromagnetic interference (EMI) is emitted from a plurality of electronic elements included in the display device. EMI can cause the display device to malfunction or harm the human body. Therefore, an electromagnetic shielding filter is attached to the display device to shield the EMI.

At this time, the printing composition for a conventional electromagnetic wave shielding filter generally includes an acrylate polymer resin, a solvent, a conductive metal and a black pigment. However, these conventional printing compositions are mostly applied to a resin substrate, and there are inconveniences such as adhering the printing composition to a resin substrate or adding a separate coating layer to the surface of the resin substrate. The thickness reduction of the electromagnetic wave shielding filter to which the composition is applied also has a limitation), and organic matters such as polymer resins derived from the adhesive or a separate coating layer, etc., remain.

For this reason, the effort to develop the printing composition for electromagnetic wave shielding filters applicable to a glass substrate is made | formed. Among them, a method of applying a paste composition to a glass substrate using an offset process is known in part.

When the paste composition is applied to the glass substrate using the offset process, an EMI mesh pattern may be formed.

However, in the case of the silver paste composition using the conventional offset process, the powder having an average particle diameter of 0.5 to 30 μm is used alone, and when the low temperature is fired at 500 ° C. or lower, it is difficult to obtain a dense pattern and the electrical resistance is also high. there is a problem. Therefore, firing at high temperature is necessary to lower the electrical resistance of the conductor. In addition, in the case of the conventional composition, the softening of the glass frit is required in order to have an appropriate adhesive force, so that baking at a high temperature is required.

Accordingly, the present invention is to provide a black conductive paste composition for an electromagnetic shielding filter capable of low-temperature baking when the offset process is applied.

In addition, the present invention is to provide a black conductive paste composition that enables the provision of an electromagnetic shielding filter excellent in adhesion and electrical resistance to the substrate.

The present invention also provides a filter for shielding electromagnetic waves formed by printing the black conductive paste composition on a glass substrate and baking at a low temperature.

The present invention also provides a display device including an electromagnetic shielding member formed using the black conductive paste composition.

The present invention comprises a) a polymer resin and a monomer or oligomer, b) solvent, c) glass powder, d) conductive material and e) black pigment,

The conductive material provides a black conductive paste composition comprising a conductive metal powder having an average particle size of 0.5 to 5 μm and conductive fine particles having an average particle diameter of 0.02 to 0.09 μm.

The black conductive paste composition is a paste composition for an electromagnetic shielding filter applied to a display device such as a plasma display panel. Preferably, the black conductive paste composition is printed (eg, offset printed) on a glass substrate, and then 400 to 550 ° C. The low-temperature baking for 15 to 30 minutes at can provide the electromagnetic shielding filter for the display device.

The paste composition may include 5 to 15 parts by weight of polymer resin and monomer or oligomer, 5 to 15 parts by weight of solvent, 1 to 10 parts by weight of glass powder, 50 to 90 parts by weight of conductive material, and 1 to 10 parts by weight of black pigment. . In addition, the paste composition of the present invention is a modified acrylic block copolymer, an alkylol ammonium salt polymer, a block copolymer containing a base pigment affinity group, an acrylic block copolymer, a fluorinated alkyl oligomer, a polyether modified dimethylpolysiloxane copolymer and a modified poly It is preferred to further comprise 0.05 to 1 parts by weight of at least one dispersant selected from the group consisting of urethanes.

The present invention also includes a glass substrate, and an electromagnetic shielding member formed in a mesh form on the glass substrate, wherein the electromagnetic shielding member prints the black conductive paste composition on the glass substrate, and at 15 to 400 to 550 ° C. It provides an electromagnetic shielding filter formed by baking at a low temperature for 30 minutes.

The present invention also includes a glass substrate, an electromagnetic shielding member formed in a mesh form on the glass substrate, and a display panel which displays an image and faces the glass substrate, wherein the electromagnetic shielding member is formed from the display panel. The display device is applied to shield the emitted electromagnetic waves, and is formed by printing the black conductive paste composition on the glass substrate and baking at low temperature at 400 to 550 ° C. for 15 to 30 minutes.

Hereinafter, the present invention will be described in detail.

The present invention provides a black conductive paste composition which can provide an electromagnetic wave shielding filter which is excellent in appearance quality of a pattern and can improve a continuous process, and which is excellent in printability, adhesive force, electrical resistance and optical characteristics, and a display device using the same. The present invention relates to a method for providing an electromagnetic shielding filter.

As a result of the experiments of the present inventors, it was confirmed that at least one or more types of conductive fine particles were included in the paste composition in addition to the usual conductive metal powder, so that low-temperature baking of the paste was possible in the offset printing process. In particular, it has been found that the use of the conductive fine particles can surprisingly increase the densification effect of the conductor film, thereby lowering the electrical resistance value.

Therefore, when printed and fired on a glass substrate using the black conductive paste composition of the present invention, the electromagnetic shielding filter formed by low temperature firing includes a mesh pattern having a constant shape, thickness, and line width, and particularly has excellent electrical resistance. By improving the plasma display characteristics, it is possible to improve the continuous process while improving the quality.

In such a black conductive paste composition of the present invention, the conductive material includes a conductive metal powder and conductive fine particles.

It is preferable that the said conductive metal powder contains 1 type chosen from the group which consists of silver, copper, nickel, gold, platinum, and these alloys. In addition, these may be spherical, plate-like, blocky, rod-like, particulate, or the like, and spherical powders having low particulate and cohesive and good dispersibility may be preferably used in order to improve printability and dispersibility of the conductive paste.

The size of the metal powder used as the conductive metal may have an average particle size of 0.5 ~ 5 ㎛.

If the metal powder has an average particle size that is too small, less than 0.5 μm, dispersion is difficult and the paste composition may have a high viscosity or gelation, resulting in poor printing properties and good pattern through printing of the paste composition. Difficult to form In addition, when the metal powder has an average particle size that is too large exceeding 5 μm, the metal powder is not uniformly filled in the pattern formed by printing the paste composition, and thus the electromagnetic wave shielding filter has a uniform electromagnetic shielding. It is difficult to show the performance, and holes and the like are generated in the pattern, so that it is difficult to form a desirable pattern and an electromagnetic shielding filter. On the other hand, when the metal powder has an average particle size of 0.5 ~ 5 ㎛, it is possible to further improve the printing properties and electromagnetic shielding performance of the paste composition, it is possible to prevent the generation of holes in the pattern.

The conductive metal powder preferably has a specific surface area of 0.5 to 4.5 m 2 / g in consideration of dispersibility, printability, and the density of the pattern.

In addition, the conductive fine particles may be one or more fine particles selected from the group consisting of silver, copper, nickel, gold, platinum, and alloys thereof, similarly to the conductive metal powder.

It is preferable that the average particle diameter of the said electroconductive fine particles is 0.02-0.09 micrometer, and when the particle diameter is less than 0.02 micrometer, there exists a problem that agglomeration occurs in a paste because the particle size is too fine, and when it exceeds 0.09 micrometer, there exists a problem of dense pattern formation, There is a problem that the low-temperature sintering effect is reduced, thereby increasing the electrical resistance.

The conductive fine particles have a specific surface area of 3 to 50 m 2 / g in consideration of printability and low temperature sintering effect. If the specific surface area is less than 3 m 2 / g, the particles are too large and the sintering promoting effect is lowered at the time of low temperature firing, which is undesirable.

In this invention, the average particle diameter of electroconductive fine particles can be measured from the particle size analysis measuring apparatus by a laser diffraction method, or the photograph of the metal fine particle photographed by TEM (transmission electron microscope).

In addition, the conductive material preferably contains 3 to 25 parts by weight of the conductive fine particles with respect to 100 parts by weight of the conductive metal powder. At this time, when the content of the conductive fine particles is less than 3 parts by weight, the low-temperature firing effect and the densification effect of the printing pattern is reduced. When the content of the conductive fine particles is more than 25 parts by weight, the conductive fine particles are excessively agglomerated, resulting in a deterioration of printing characteristics and thus a good pattern. Difficult to get.

In the black conductive paste composition of the present invention, the conductive material is preferably contained in an amount of 50 to 90 parts by weight. At this time, if the content is less than 50 parts by weight may reduce the electromagnetic shielding performance due to the increase in electrical resistance, if the content exceeds 90 parts by weight may increase the viscosity of the paste, it is difficult to disperse printing characteristics may be reduced.

Meanwhile, in the black conductive paste composition of the present invention, the polymer resin may be methyl acrylate (MA), butyl methacrylate (BM), hydroxyethyl methacrylate (HEMA), Any one selected from the group consisting of methyl methacrylate (MMA), ethyl acrylate (EA), ethylhexyl acrylate (ethylhexyl acrylate), nonyl acrylate and their methacrylates Polymers or two or more copolymers may be used. In addition, the polymer resin may be one or more selected from the group consisting of cellulose derivatives such as ethyl cellulose, methyl cellulose, nitro cellulose, carboxymethyl cellulose, polyvinyl alcohol, and polyvinyl butyral.

Preferably, as the acrylate polymer resin, methyl acrylate (MA), butyl methacrylate (BM), hydroxyl methacrylate (HEMA), and methyl methacrylate ( methlmethacrylate, MMA) copolymerized in a weight ratio of 10 to 30:30 to 60:10 to 20:10 to 20 can be used. However, the acrylate polymer resin is not limited thereto, and any acrylate polymer resin known to be usable as a binder resin in other conductive paste compositions for electromagnetic wave shielding filters may be used without particular limitation.

The acrylate polymer resin uniformly disperses other components of the black conductive paste composition, that is, glass powder, conductive metal, black pigment, and the like, and the electromagnetic wave shielding filter formed from the black conductive paste composition provides uniform electromagnetic shielding performance and It plays a role in showing optical characteristics.

Preferably, the acrylate polymer resin has a weight average molecular weight of 5,000 to 100,000, more preferably 5,000 to 60,000. When the weight average molecular weight of the acrylate polymer resin is less than 5,000, the glass transition temperature of the polymer is low, and thus the flow characteristic of the polymer is increased, so that the black conductive paste composition may be blanced from the gravure groove during the printing process (eg, gravure offset printing process). Pattern transfer to the kit is difficult, and exceeding 100,000 makes it difficult to add the composition into the gravure groove due to the excessive elastic properties of the polymer.

The monomer or oligomer preferably comprises at least one member selected from the group consisting of an acrylate compound, an alkoxylate compound, dimethyl sulfoxide and an unsaturated polyester compound.

Examples of the monomer or oligomer include methyl acrylate, methyl methacrylate, hydroxyethyl methacrylate, glycidyl methacrylate, butyl methacrylate, ethyl methacrylate, benzyl methacrylate and ethyltriglycol. Methacrylate, nonyl acrylate, nonyl methacrylate, ethyl acrylate, ethyl methacrylate, ethylhexyl acrylate, ethylhexyl methacrylate, urethane acrylate, lauryl acrylate, oligoether acrylate , Polyether acrylate compound, polyester acrylate compound, silicone acrylate, trimethylolpropane triacrylate, neopentyl glycol hydroxy pivalate modified caprolactone (Neopentylglycol hydroxypivalate diacrylate modified caprolactone), polyethylene glycol diacryl , Polypropylene glycol diacrylate, tetraethylene glycol diacrylate, pentaerythritol triacylate, trimethylolpropane triacrylate modified ethylene oxide (modified EO), trimethylolpropane triacrylate modified poly Propylene oxide (modified PO), dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate modified caprolactone, ditrimethylolpropane tetra Acrylate, pentaerythritol tetraacrylate, pentaerythritol ethoxylated triacrylate, urethane methacrylate, lauryl methacrylate, oligoether methacrylate, polyether methacrylate type Compound, paul Leester methacrylate type compound, silicone methacrylate, trimethylolpropane trimethacrylate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, pentaerythritol trimetha Acrylate, trimethylolpropane trimethacrylate, dipentaerythritol hexamethacrylate, dipentaerythritol pentamethacrylate, ditrimethylolpropane tetramethacrylate, pentaerythritol tetramethacrylate, penta Erythritol ethoxylated trimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, bisphenol A ethoxylated dimethacrylate, trimethylolpropane ethoxylate (4 / 15 EO / OH), trime The rate include (20/3 EO / OH), trimethylolpropane propoxylate (1 PO / OH), 1 or more kinds selected from the group consisting of dimethyl sulfoxide, and unsaturated polyester ethoxylates propane. At this time, the dimethyl sulfoxide is generally used as a solvent, in the case of the present invention can be used as a monomer replacement. More preferably, the monomer or oligomer is at least one selected from the group consisting of urethane acrylate, trimethylolpropane triacrylate modified ethylene oxide, trimethylolpropane triacrylate modified propylene oxide and bisphenol A ethoxylated dimethacrylate. Can be.

In addition, the monomer or oligomer is not particularly limited to the above examples, it is possible to prevent the drying in the offset method, to improve the transferability of the paste, and to use any monomer or oligomer usable in the conductive paste composition for electromagnetic wave shielding filter. It may be.

The content of such monomers or oligomers is preferably included in an amount of 10 to 90 parts by weight, based on 100 of the total amount of the acrylate polymer resin and the monomer or oligomer. Therefore, the weight ratio of the acrylate polymer resin and the monomer or oligomer may be 10:90 to 90:10. In this case, when the content of the monomer or oligomer is less than 10 parts by weight, there is a problem that the drying prevention effect of the paste composition is reduced by reducing the drying effect, and when the content of the monomer or oligomer exceeds 90 parts by weight, the elasticity of the paste composition is reduced and the pattern spreading phenomenon is deepened or printed. It may deteriorate and may not have a shape.

In addition, the content of the polymer resin and the monomer or oligomer is preferably included in 5 to 15 parts by weight in the total paste composition. When the content of the polymer resin and the monomer or oligomer is less than 5 parts by weight, there is a possibility that a problem occurs in the printing process due to the decrease in elasticity of the paste composition, and when it exceeds 15 parts by weight, the electrical resistance of the pattern formed from the paste composition increases. Problems may arise.

On the other hand, in the black conductive paste composition, the solvent is a medium for dissolving other components, it is preferably included in 5 to 15 parts by weight in the total paste composition. When the content of the solvent is less than 5 parts by weight, there is a problem that the drying speed of the paste composition becomes difficult to proceed with continuous printing, and when the content of the solvent exceeds 15 parts by weight, the viscosity of the paste composition is lowered and the printability is deteriorated.

As such a solvent, any solvent known to be usable in the conductive paste composition for an electromagnetic shielding filter can be used without particular limitation, but preferably at least one or more of a high boiling point solvent having a boiling point of 200 ° C or higher and a boiling point of less than 200 ° C It may contain at least one or more of low boiling point solvents.

By including the high boiling point solvent and the low boiling point solvent together, the viscosity and fluidity of the paste composition can be maintained at a desirable level, and thus, the process of printing the paste composition on a glass substrate transfers the pattern of the paste composition to a pattern. In addition to being easy, the spreading of the pattern is suppressed, so that the straightness of the pattern can be further improved.

As the high boiling point solvent, for example, one or more solvents selected from the group consisting of gamma butyrolactone, butyl carbitol acetate, carbitol, methoxymethyl ether propionate and tepinol can be used. Any organic solvent known to be usable for the conductive paste composition for electromagnetic wave shielding filter having the above boiling point can be used.

Moreover, as said low boiling point solvent, propylene glycol monomethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol monomethyl ether, dipropylene glycol monomethyl ether, propylene glycol monomethyl ether propionate, ethyl ether, for example. One or more solvents selected from the group consisting of propionate, propylene glycol monomethyl ether acetate, methyl ethyl ketone, and ethyl lactate can be used, and used in conductive paste compositions for electromagnetic wave shielding filters with boiling points below 200 ° C. Any organic solvent known to be possible can be used.

In addition, the solvent may include 12 to 88% by weight of the high boiling point solvent and 12 to 88% by weight of the low boiling point solvent. If the high boiling point solvent is included in the solvent in an amount less than 12% by weight, and the content of the low boiling point solvent is excessively increased, the rate of fluidity decrease of the paste composition may be too high, so that the transition to the pattern may not be easy. On the contrary, if the content of the high boiling point solvent is excessively increased beyond 88% by weight, as the fluidity of the paste composition is difficult to suppress, the spreading of the pattern is intensified, and thus the straightness of the pattern formed through printing of the paste composition may be reduced. .

Meanwhile, in the black conductive paste composition of the present invention, the glass powder may be Pb-based and Pb-free-based powders, but in terms of environmental regulation, Pb-free-based powders may be used rather than Pb-based powders. It is desirable to consider the removal temperature of the organic material and the improvement of pattern adhesion to the glass substrate. Such Pb-free powders include Bi-based glass powders such as Bi ₂ O ₃ -based glass powders. In addition, colored glass powders prepared by incorporating black or colored pigments in the production of glass powders or glass powders containing colored components such as V ₂ O ₅ can also be preferably used. That is, the glass powder may be used in the composition system which is fired in the 400 ~ 600 ℃ range, for example, Pb-based, Bi-based, ZnO-B ₂ O ₃ -BaO-based, V ₂ O ₅ -BaO-based. In case of Pb system, the adhesion strength is high at about 430 ℃ ~ 500 ℃, and at 480 ℃ ~ 500 ℃ for Bi, and 400 ℃ ~ 500 ℃ for V ₂ O ₅ -BaO series, and ZnO-B ₂ O ₃ -BaO series In the case of 500 ℃ ~ 600 ℃ degree.

The content of the glass powder may be 1 to 10 parts by weight, preferably 2 to 7 parts by weight, in the total paste composition. If the content of the glass powder is less than 1 part by weight, there is a problem in that the adhesion of the paste composition to the glass substrate is weakened. If the content of the glass powder is more than 10 parts by weight, the electrical resistance of the pattern formed from the paste composition is increased, thereby deteriorating the electromagnetic wave shielding efficiency. .

In the black conductive paste composition, the black pigment is used to reduce external light reflection and improve contrast of the display device, and may include cobalt, copper, rudennium, manganese, nickel, chromium, or iron-based compounds. And preferably include cobalt-based compounds. In addition, the black pigment is more preferably used in the form of an auxiliary pigment, such as copper, rudenium, manganese, nickel, chromium or iron, in addition to the cobalt-based compound to improve the blackness.

The black pigment may be included in an amount of 1 to 10 parts by weight, preferably 2 to 7 parts by weight, in the entire paste composition. When the content of the black pigment is less than 1 part by weight, sufficient contrast improvement cannot be expected, and when it exceeds 10 parts by weight, the electrical resistance is increased and the electromagnetic wave shielding property may be deteriorated.

In addition, the black conductive paste composition may be a modified acrylic block copolymer, an alkylol ammonium salt polymer, a block copolymer containing a base pigment affinity group, an acrylic block copolymer, a fluorinated alkyl oligomer, a polyether modified dimethylpolysiloxane copolymer and a modified polyurethane. It may further comprise one or more dispersants selected from the group consisting of. In addition, such dispersants belong to the categories of the polymers listed above, and any polymer well known or commercially available in the art may be used without any limitation.

For example, commercially available DISPERBYK-2000 or DISPERBYK-2001 may be used as the modified acrylic block copolymer, and commercially available DISPERBYK-180, DISPERBYK-181, DISPERBYK-187 may be used as the alkylol ammonium salt polymer. , DISPERBYK-140, BYK-151, BYK-9076, BYK-W968 or BYK-W969 can be used. As the block copolymer containing a base pigment affinity group, for example, triblock alkyl trimethylammonium may be used, and commercially available DISPERBYK-112, DISPERBYK-116, DISPERBYK-2050, DISPERBYK-2150 or BYK-9077 can be used. As the acrylic block copolymer, commercially available EFKA-4310, EFKA-4320, EFKA-4330, EFKA-4340 or EFKA-4585 and the like can be used, and commercially available F-471 and F as fluorinated alkyl oligomers. -474, F-475, F-477, F-478, F-479, F-486 or MCF 350SF can be used. In addition, as the polyether modified dimethylpolysiloxane copolymer, commercially available BKY-300, BKY-301, BKY-335, BKY-302, BKY-331, BKY-306, BKY-330, BKY-341, BKY-344, BKY-307 or BKY-333 can be used, and the modified polyurethane can be commercially available EFKA-4008, EFKA-4046, EFKA-4009, EFKA-4047, EFKA-4050, EFKA-4055, EFKA-4010, EFKA-4015, EFKA-4020, EFKA-4060, EFKA-4080, BYK-425 or Dispers-710 can be used.

In addition to the commercially available polymers listed above, the modified acrylic block copolymers, alkylol ammonium salt polymers, block copolymers containing base pigment affinity groups, acrylic block copolymers, fluorinated alkyl oligomers, polyether modified dimethylpolysiloxane copolymers or modified polymers Any polymer that falls within the category of polyurethane can be used without particular limitation.

Such dispersants improve the dispersibility of other components (eg, black pigments, conductive metals, glass powders, etc.), so that they can exhibit uniform electromagnetic shielding performance and excellent optical properties.

The content of the dispersant is preferably contained in 0.05 parts by weight to 1.0 parts by weight in the total paste composition. If the content of the dispersant is less than 0.05 parts by weight, sufficient dispersibility and contrast improvement cannot be expected. If the content of the dispersant is more than 1.0 part by weight, the electrical resistance may be increased to deteriorate electromagnetic wave shielding properties.

On the other hand, the present invention provides a filter for shielding electromagnetic waves formed using the paste composition described above.

The electromagnetic wave shielding filter includes an i) glass substrate and ii) an electromagnetic shielding member formed in a mesh form on the glass substrate. The electromagnetic shielding member is applied to shield electromagnetic waves.

The electromagnetic shielding member may be formed by printing the above-described paste composition on a glass substrate and calcining at low temperature, preferably offset printing (particularly, gravure offset printing) of the paste composition for 15 minutes at 400 to 550 ° C. It may be formed by low-temperature baking for 30 minutes.

In addition, the electromagnetic shielding member may include: i) at least one first shielding portion extending in one direction, and ii) at least one second shielding portion crossing the first shielding portion. In this case, the width of the first shielding portion may be greater than 0 and 50 μm or less, and preferably 15 μm to 30 μm. The one or more first shields may include a plurality of first shields, and the average pitch of the plurality of first shields may be greater than 0 and less than or equal to 500 μm. Preferably, the average pitch of the plurality of first shielding parts may be 200 μm to 400 μm.

In addition, the angle formed by the crossing of the first shielding portion and the second shielding portion may be 60 ° to 120 °, and preferably 80 ° to 100 °. Most preferably, the angle formed by the crossing of the first shielding portion and the second shielding portion may be substantially 90 °.

The angle formed by one side of the first shielding portion and the glass substrate may be 20 ° to 70 °, and preferably 35 ° to 55 °.

In addition, the electromagnetic shielding member may have an opening having a polygonal shape, and the opening may be chamfered. The lengths of all sides forming the polygon may be substantially the same, and furthermore, the polygon may be substantially square.

The electromagnetic shielding member may include a conductive metal. The conductive metal may be one or more metals selected from the group comprising silver, copper, nickel, gold, platinum and alloys thereof.

In addition, the above-described electromagnetic shielding filter may further include an edge layer formed along the edge of the glass substrate. An electromagnetic shielding member may be formed on the edge layer. In this case, the electromagnetic shielding filter may further include a grounding member connected to an end of the electromagnetic shielding member to ground the electromagnetic shielding member.

On the other hand, the present invention provides a display device formed using the paste composition described above.

Such display devices include i) a glass substrate, ii) an electromagnetic shielding member formed in a mesh form on the glass substrate, and iii) a display panel that displays an image and faces the glass substrate. In this case, the electromagnetic shielding member is applied to shield the electromagnetic waves emitted from the display panel, and is formed by printing and baking the paste composition on the glass substrate.

In the display device, the display panel may include i) a first substrate and a second substrate facing each other, and ii) a black layer disposed between the first substrate and the second substrate. In this case, the electromagnetic shielding member may cross three-dimensionally with the black layer. In addition, the electromagnetic shielding member may contact the second substrate. The thickness of the glass substrate on which the electromagnetic shielding member is formed may be equal to or greater than the thickness of the first substrate. In addition, the electromagnetic shielding member may have an opening having a polygonal shape, and the opening may be chamfered. The lengths of all sides forming the polygon may be substantially the same, and furthermore, the polygon may be substantially square.

The electromagnetic shielding member may be formed by offset printing (particularly, gravure offset printing) and baking the paste composition. In addition, the electromagnetic shielding member may include: i) at least one first shielding portion extending in one direction, and ii) at least one second shielding portion crossing the first shielding portion. In this case, the width of the first shielding portion may be greater than 0 and 50 μm or less, preferably 15 μm to 30 μm. The one or more first shields may include a plurality of first shields, and the average pitch of the plurality of first shields may be greater than 0 and less than or equal to 500 μm. Preferably, the average pitch of the plurality of first shielding parts may be 200 μm to 400 μm.

The angle formed by the crossing of the first shielding portion and the second shielding portion may be 60 ° to 120 °, and preferably 80 ° to 100 °. Most preferably, the angle formed by the crossing of the first shielding portion and the second shielding portion may be substantially 90 °.

In addition, an angle formed by one side of the first shielding portion and the glass substrate may be 20 ° to 70 °, and preferably 35 ° to 55 °.

The display panel may be a plasma display panel.

Hereinafter, the electromagnetic wave shielding filter and the display device will be described with reference to the accompanying drawings so that a person skilled in the art can easily implement the present invention. As can be easily understood by those skilled in the art, the following embodiments are only intended to illustrate the present invention, and various forms without departing from the spirit and scope of the present invention. It can be modified. Where possible the same or similar parts are represented with the same reference numerals in the drawings.

All terms including technical terms and scientific terms used below have the same meaning as those commonly understood by those skilled in the art. Terms defined in advance are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

It is to be understood that the terms first, second and third are used to describe various parts, components, regions, layers and / or sections, but are not limited to these. These terms are only used to distinguish one part, component, region or section from another part, component, region or section. Accordingly, the first portion, component, region, layer or section described below may be referred to as the second portion, component, region, layer or section without departing from the scope of the invention.

1 schematically shows an electromagnetic wave shielding filter 100 according to an embodiment of the present invention. The enlarged source of FIG. 1 shows the inside of the electromagnetic wave shielding filter 100 in an enlarged manner.

As shown in FIG. 1, the electromagnetic wave shielding filter 100 includes a glass substrate 20, an electromagnetic wave shielding member 10, an edge layer 30, and a grounding member 40. The glass substrate 20 is used to form the electromagnetic shielding member 10 by an offset printing (in particular, gravure offset printing) method. The long side of the glass substrate 20 is parallel to the x axis, and the short side is parallel to the y axis.

The electromagnetic shielding member 10 is connected to the ground member 40 and grounded. Therefore, the electromagnetic shielding member 10 may absorb and remove electromagnetic waves. As a result, the electromagnetic wave shielding member 10 functions as a filter for shielding electromagnetic waves. The edge layer 30 is formed along the edge of the glass substrate 20, and the ground member 40 is positioned at both ends of the glass substrate 20 in the x-axis direction to ground the electromagnetic shielding member 10.

As shown in the enlarged circle of FIG. 1, the electromagnetic shielding member 10 is formed in a mesh form. The electromagnetic wave shielding filter 100 is mainly used for a display device. Therefore, the electromagnetic shielding member 10 is formed in a mesh form so that an image emitted from the display device is displayed to the outside. Since the electromagnetic wave shielding member 10 has an opening 109, the electromagnetic wave can be blocked while passing an image through the opening 109.

The electromagnetic shielding member 10 includes a first shielding portion 101 and a second shielding portion 103. The first shielding portion 101 extends in the x-axis direction and intersects with the second shielding portion 103. That is, as shown in the enlarged circle of FIG. 1, the first shielding portion 101 and the second shielding portion 103 meet with each other to form an angle α1. The angle α1 may be 60 ° to 120 °. If the angle α1 is too large or too small, the distance between the first shielding portion 101 and the second shielding portion 103 becomes too close and the aperture ratio may be too small. More preferably, the angle α1 may be between 80 ° and 100 °. In this case, the distance between the first shielding portion 101 and the second shielding portion 103 can be properly maintained. Moreover, it is most preferable if angle (alpha) 1 is substantially 90 degrees.

The method for producing an electromagnetic shielding filter includes i) providing a gravure roll with a groove formed in a mesh shape, ii) filling the groove with the paste composition described above, and iii) opposing the gravure roll and rotating direction of the gravure roll. Providing a blanket roll that rotates in the opposite direction, iv) transferring the paste composition to the blanket roll while rotating the gravure roll, v) providing a glass substrate, vi) the paste composition as the blanket roll moves over the glass substrate And vii) firing the paste composition to form an electromagnetic shielding member on the glass substrate.

In the embodiment of the present invention, in order to form the electromagnetic wave shielding member 10 in the form of a mesh, a gravure roll 55 (shown in FIG. 3) having a mesh groove 551 (shown in FIG. 3) formed in an oblique direction is used. use. If the groove 551 is not formed in an oblique direction and is orthogonal to the rotation direction of the gravure roll 55, the paste composition 10a which is a raw material of the electromagnetic shielding member 10 accommodated in the groove 551 (Fig. 3). Is not well away from the groove 551. That is, since the paste composition 10a is not affected by the rotational force of the gravure roll 55, it is not easy to drop the paste composition 10a from the gravure roll 55.

On the other hand, when the rotation direction of the gravure roll 55 and the direction in which the grooves 551 extend coincide with each other, the paste composition 10a may be well separated from the grooves 551 by the rotational force of the gravure roll 55. Therefore, when the groove 551 is formed in a direction coinciding with the rotation direction of the gravure roll 55, the electromagnetic shielding member 10 having the opening 109 having a uniform size may be formed.

More specifically, when the groove is formed only in the direction coinciding with the rotation direction of the gravure roll, it is impossible to form the shield member in the form of a mesh. That is, the mesh shape may have a rectangular shape, and since the grooves must be formed in the direction orthogonal to the rotation direction of the gravure roll, it is difficult to transfer the paste composition to the blanket roll.

As shown in the enlarged circle of FIG. 1, when the electromagnetic shielding member 10 is formed on the glass substrate 20 by using the above-described method, the first shielding portion 101 has a constant angle α2 with the x-axis direction. ). The angle α2 may be 20 ° to 70 °. If the angle α2 is too small or too large, the first shielding portion 101 and the second shielding portion 103 may be densely packed to reduce the electromagnetic shielding effect. In addition, when the electromagnetic wave shielding filter 100 is used in the display device 200 (shown in FIG. 4), the moiré shape may be formed while overlapping the black layer 651 of the display device 200. More specifically, the angle α2 may be 35 ° to 55 °.

As shown in the enlarged source of FIG. 1, the resolution of the image can be increased by maximizing the area of the opening 109 by forming the width W of the electromagnetic shielding member 10 small. To this end, the width W of the electromagnetic shielding member 10 may be greater than 0 and 50 μm or less. In this case, the electromagnetic wave shielding member 10 cannot be observed by the naked eye. When the width W of the electromagnetic wave shielding member 10 is too large, the size of the opening 109 becomes small and the resolution of the image is lowered. More specifically, the width W of the electromagnetic shielding member 10 is preferably 15 μm to 30 μm.

On the other hand, the average pitch P of the electromagnetic wave shielding member 10 can be larger than 0 and 500 micrometers or less. If the average pitch P of the electromagnetic shielding member 10 is too large, the electromagnetic shielding member 10 is not formed densely, and thus electromagnetic waves may be emitted to the outside without being absorbed. As a result, the electromagnetic shielding effect is lowered. In more detail, it is preferable that the average pitch P of the shielding member 10 is 200 micrometers-400 micrometers.

The electromagnetic shielding member 10 may include a conductive metal to maximize the electromagnetic shielding effect. Since the conductive metal can collect electromagnetic waves passing through the electromagnetic shielding filter 100, the electromagnetic shielding effect is excellent. Silver, copper, nickel, gold, platinum, or an alloy thereof can be used as the conductive metal. Since the conductive metals are excellent in electrical conductivity, they can effectively shield electromagnetic waves.

FIG. 2 partially shows a cross-sectional structure of the electromagnetic wave shielding filter 100 taken along the line II-II of FIG. 1.

As shown in FIG. 2, the electromagnetic shielding member 10 is formed on the edge layer 30 formed on the glass substrate 20. Since the edge layer 30 includes black ceramic, the appearance of the electromagnetic wave shielding filter 100 may be improved. In addition, the edge layer 30 may effectively connect the ground member 40 to the electromagnetic shielding member 10. The thickness of the edge layer 30 may be about 15 μm to 20 μm. After the paste composition is printed on the edge layer 30 formed on the glass substrate 20 by the offset method to form the electromagnetic shielding member 10, the ground member 40 is formed thereon. As the ground member 40, a conductive film tape can be used.

3 schematically illustrates a process of manufacturing the electromagnetic shielding filter 100 of FIG. The electromagnetic wave shielding filter 100 may be manufactured using the offset printing apparatus 500. Hereinafter, the offset printing method will be described in detail.

As shown in FIG. 3, the offset printing apparatus 500 includes a dispenser 51, a doctor 53, a gravure roll 55, and a blanket roll 57. The offset printing method uses the offset printing apparatus 500 and includes an off process and a set process. In the off process, the paste composition 10a is removed from the gravure roll 55. In the set process, the removed paste composition 10a is applied onto the glass substrate 20. The dispenser 51 discharges the paste composition 10a at predetermined time intervals. The paste composition 10a discharged from the dispenser 51 is accommodated in the groove 551 formed in the gravure roll 55. As described above, the paste composition 10a may include an organic substance having elasticity, a conductive metal, a solvent, a binder, a predetermined dispersant, and the like. As a solvent, an organic solvent having a boiling point of 200 ° C. or more and an organic solvent having a boiling point of less than 200 ° C. may be used together, and a glass powder, that is, glass frit may be used as the binder. The organic material may include an acrylate resin, an acrylic resin, polyester, polyurethane, oligomer, monomer, and the like. The solvent and the organic substance may be removed in the process of firing the glass substrate 20. The paste composition 10a further contains a black pigment and a predetermined dispersant.

Since the amount of the paste composition 10a contained in the groove 551 is large, the paste composition 50a may overflow to the outside of the groove 551. Therefore, the paste composition 10a overflowed by the doctor 53 is removed while rotating the gravure roll 55 in the arrow direction (counterclockwise direction). Since the doctor 53 is in contact with the outer surface of the gravure roll 55, the paste composition 10a overflowed to the outside of the groove 551 can be efficiently removed. Therefore, the paste composition 10a can be appropriately filled in the groove 551 of the gravure roll 55 without overflowing.

The blanket roll 57 is located opposite the gravure roll 55. The blanket roll 57 rotates in the direction opposite to the rotation direction of the gravure roll 55 (clockwise). As a result, the paste composition 10a contained in the groove 551 is transferred onto the blanket roll 57 while the gravure roll 55 meets the blanket roll 57. Therefore, the paste composition 10a adheres to the outer surface of the blanket roll 57.

The blanket roll 57 applies the paste composition 10a onto the glass substrate 20 while moving on the glass substrate 20 in the direction of the arrow. The glass substrate 20 is cleaned and prepared. A paste composition 10a in the form of a mesh for forming the electromagnetic shielding member 10 (shown in FIG. 1) is formed on the glass substrate 20.

Next, the glass substrate 20 is put into a heating furnace (not shown) and heated, and the solvent and organic substance contained in the paste composition 10a are removed. The paste composition 10a may be dried before this firing process. The electromagnetic wave shielding member can be directly formed by heating the glass substrate 20 and removing a solvent and an organic substance. That is, the electromagnetic wave shielding filter is directly manufactured without performing a separate process such as etching the paste composition 10a. Therefore, since the process is simple, the manufacturing cost of the electromagnetic shielding filter can be reduced.

Since the offset printing method used when manufacturing the electromagnetic wave shielding filter includes a firing process, the glass substrate 20 is used in the offset printing method rather than using a resin substrate that is weak in heat. Other contents of the offset printing method can be easily understood by those skilled in the art, and detailed description thereof will be omitted.

When manufacturing the electromagnetic wave shielding filter using the photolithography method instead of the offset printing method, the copper foil is first adhered to the resin film. Next, a dry film resist is laminated on copper foil, and exposure, image development, an etching, a peeling process, etc. are performed in order to form a pattern. Therefore, the manufacturing process is complicated and the productivity is not good.

In addition, in the case of manufacturing the electromagnetic shielding filter using the plating method, a pattern must be formed on the resin film and copper should be plated to obtain a desired electrical conductivity. However, waste liquid generated during plating causes environmental pollution.

The above-described photolithography method and plating method cannot form a pattern directly on a glass substrate. For example, the plating method is carried out by winding the base material in the form of a roll and immersing it in a plating bath. Since the glass substrate cannot be wound in the form of a roll, it is impossible to plate the glass substrate to form the electromagnetic shielding member. Moreover, when using a glass substrate, since a pattern must be adhere | attached to a glass substrate, a process is complicated. The offset printing method can solve the above problem. That is, in the offset printing method, since the electromagnetic shielding member 10 is directly formed on the glass substrate 20, the process may be simplified to reduce the manufacturing cost. In addition, in the offset printing method, no harmful substances are discharged, and thus no pollution is caused.

FIG. 4 schematically shows a display device 200 including the filter 100 for shielding electromagnetic waves of FIG. 1. In the enlarged circle of FIG. 4, the display device 200 viewed in the z-axis direction is enlarged.

As shown in FIG. 4, the electromagnetic shielding filter 100 is fixed on the display panel 600 (shown in FIG. 5) using the fixing member 110. Therefore, the electromagnetic wave shielding filter 100 may be stably stored in the display device 200.

As shown in the enlarged circle of FIG. 4, the electromagnetic shielding member 10 is positioned on the black layer 651 included in the display panel 600 (shown in FIG. 5). In addition, the black layer 651 is positioned between the first substrate 610 and the second substrate 620 of the display panel. In addition, although not shown in the enlarged source of FIG. 4, a second substrate 620 (shown in FIG. 5) is positioned between the electromagnetic shielding member 10 and the black layer 651, and the electromagnetic shielding member 10 is disposed. The glass member 20 (shown in FIG. 5) is located on the top of the glass member 20.

The electromagnetic shielding member 10 shields electromagnetic waves emitted from the display panel 600.

As shown in the enlarged circle of FIG. 4, the electromagnetic shielding member 10 has an opening 109 having a rhombus shape. Although not shown in FIG. 4, the electromagnetic shielding member 10 is preferably substantially square. In this case, the electromagnetic shielding effect may be maximized by optimizing the shape of the electromagnetic shielding member 10.

The lengths of the four sides forming the opening 109 are substantially the same. Since the lengths of the four sides are substantially the same, the shape of the electromagnetic shielding member 10 is regular. As a result, since the intensity of light emitted through the opening 109 is uniform, a uniform image can be displayed. Meanwhile, although the opening 109 is shown in a rhombus shape in the enlarged circle of FIG. 4, this is merely to illustrate the present invention, and the present invention is not limited thereto. Therefore, the opening part 109 should just be polygonal shape.

The electromagnetic shielding member 10 is formed by an offset printing method by shielding portions that cross each other. Therefore, the width of the electromagnetic shielding member 10 becomes slightly thick at the intersection where the shields meet each other. As a result, the opening 109 has a chamfered shape. That is, since the width of the electromagnetic shielding member 10 is slightly increased at the intersection of the electromagnetic shielding member 10, the opening 109 has a shape in which the edge is eliminated. Due to the shape of the opening 109, the electromagnetic shielding member 10 is continuously formed without breaking, and thus electromagnetic waves may be shielded over the entire surface of the electromagnetic shielding member 10.

As shown in the enlarged circle of FIG. 4, the electromagnetic shielding member 10 is formed while three-dimensionally intersecting with the black layer 651. Therefore, the phenomenon of image blur can be prevented. Furthermore, since the electromagnetic wave shielding member 10 has a width so small that it is difficult to recognize with the naked eye, it has little influence on image quality. Therefore, as shown in the enlarged circle of FIG. 4, an image having a high resolution can be displayed even if the electromagnetic shielding member 10 is located on the black layer 651.

5 is a partial cross-sectional view taken along the line V-V of FIG. 4.

5 illustrates a plasma display panel as the display panel 600. The plasma display panel shown in FIG. 5 is merely for illustrating the present invention, but the present invention is not limited thereto. Therefore, other display panels requiring an electromagnetic shielding filter can be used.

The display panel 600 includes a first substrate 610, a second substrate 620, a display electrode 680, an address electrode 640, a partition 660, a phosphor layer 670, a dielectric layer 630, and a protective film ( 635 and black layer 651. The inside of the display panel 600 is filled with discharge gas. The first substrate 610 and the second substrate 620 face each other. The partition wall 660 forms a plurality of discharge cells, and a phosphor layer is formed inside the discharge cell. The dielectric layer 630 protects the address electrode 640 and the display electrode 680 from electrons. The passivation layer 635 protects the dielectric layer 630 disposed thereon.

When a voltage is applied to the address electrode 640 and the display electrode 680, a discharge occurs between the address electrode 640 and the display electrode 680. Ultraviolet rays generated by the discharge impinge on the phosphor layer 670 and the visible light is emitted from the phosphor layer 670. Meanwhile, a black layer 651 is formed on the partition wall 660 to improve contrast ratio. The black layer 651 is positioned between the first substrate 610 and the second substrate 620. Since the black layer 651 is formed on the partition wall 660 where the light is not emitted, the loss of the light emitted from the phosphor layer 670 may be reduced. More specifically, the black layer 651 may be formed in contact with the partition 660 as shown in FIG. 5 or may be formed on the dielectric layer 630 on the partition 660 as another example.

As shown in FIG. 5, the electromagnetic shielding filter 100 is positioned on the display panel 600. Accordingly, the electromagnetic wave shielding filter 100 may shield electromagnetic waves emitted from the display panel 600. Since the electromagnetic shielding member 10 contacts the second substrate 620, the electromagnetic shielding member 10 is not exposed to the outside. Therefore, it is possible to prevent the electromagnetic wave shielding member 10 from being damaged and to prevent the appearance deterioration due to the electromagnetic shielding member 10.

On the other hand, when the thickness of the first substrate 610 and the second substrate 620 is small, the display panel 600 is weak to external impact. Therefore, the strength of the display device 200 is reinforced by using the electromagnetic wave shielding filter 100 including the glass substrate 20. That is, since the thickness of the electromagnetic wave shielding filter 100 is included in the thickness of the display device 200, the display device 200 becomes thick and very strong against external impact. For example, by forming the thickness t20 of the glass substrate 20 larger than the thickness t620 of the second substrate 620, the durability of the display device 200 may be improved by the electromagnetic wave shielding filter 100. Can be.

As described above, since the black conductive paste composition of the present invention includes a specific conductive material, it is possible to improve electrical resistance, adhesive strength, and the like without lowering printing characteristics. Therefore, the present invention makes it possible to provide an electromagnetic shielding filter having a uniform shape, line width and thickness of the mesh pattern and excellent quality. In addition, the electromagnetic shielding filter may be applied to a display device to further improve optical characteristics.

In addition, the black conductive paste composition may include a black pigment and a glass powder, and may not only use a gravure offset printing method that can be directly printed on glass, but also remove organic materials through a firing process.

Therefore, the present invention can produce the electromagnetic wave shielding filter in a continuous process by using an offset printing method is simple and cheap manufacturing process compared to other processes.

In addition, when the display device including the electromagnetic wave shielding filter having excellent appearance quality is manufactured, the electromagnetic wave shielding effect of the display device can be maximized.

Hereinafter, the present invention will be described in more detail through experimental examples. These experimental examples are only for illustrating the present invention, and the present invention is not limited thereto.

Example  1-4 and Comparative example  1-2

The black conductive paste composition for gravure offset printing using a solvent, monomer or oligomer, glass powder, conductive material, black pigment and dispersant at room temperature and finally using a 3-roll mill in a polymer resin with the composition and content as shown in Table 1 below. Was prepared.

TABLE 1

Classification (parts by weight) Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Acrylate polymer resin 4 4 - 4 4 Ethyl cellulose - - 4 - - Monomer 2 2 2 2 2 BCA 7 7 7 7 7 MEDG 2.2 2.2 2.2 2.2 2.2 Dispersant 0.3 0.3 0.3 0.3 0.3 Conductive Metal 68 72 68 80 55 Conductive fine particles 12 8 12 - 25 Black powder 2 2 2 2 2 Glass powder 2.5 2.5 2.5 2.5 2.5

In Table 1, the acrylate polymer resin has a weight average molecular weight of 15,000, methyl acrylate (MA), BM (butyl methacrylate, butyl methacrylate), HEMA (hydroxyethyl methacrylate, hydroxyethyl methacrylate), and MMA (methylmethacrylate) is copolymerized in parts by weight of 30: 40: 10: 20, respectively.

As the monomer, trimethylolpropane triacrylate-modified ethylene oxide was used.

The low boiling point solvent was MEDG (Diethylene Glycol Methyl Ethyl Ether), and the high boiling point solvent was BCA (butyl carbitol acetate).

The dispersant was a block copolymer containing a base pigment affinity group (DISPERBYK-2050, BYK).

The conductive metal powder is spherical silver powder, and the average particle size is 1.5 탆 and the specific surface area is 0.9 m 2 / g. The conductive fine particles are silver powder, the average particle size is 0.05 탆 and the specific surface area is 9.2 m 2 / g. Was used.

The black pigment was Co, and the glass powder was a V ₂ O ₅ -BaO-based glass powder.

Experimental Example

(Formation of electromagnetic shielding filter)

Gravure offset printing was performed using the paste compositions prepared in Examples 1 to 4 and Comparative Examples 1 and 2 to meet the pattern specifications used for the electromagnetic shielding filter.

That is, the paste composition was printed in a mesh form on a 30 cm × 30 cm size glass substrate using the same offset printing apparatus as that shown in FIG. 3. At this time, the line width of the mesh pattern was 30㎛, the pattern specification pitch was 300㎛.

Next, the paste composition formed on the glass substrate in the firing step was maintained at 450 ° C. for 20 minutes to perform low temperature baking to form a mesh pattern for an electromagnetic shielding filter.

(Characteristic Evaluation of Electromagnetic Shielding Filter)

Printability, adhesive force, electrical resistance and the like of the electromagnetic shielding filter formed using the paste compositions of Examples 1-3 and Comparative Examples 1-2 were compared and evaluated based on the following criteria, and the results are shown in Table 2 below.

1) Printability judgment standard:

○-1) Pattern transfer is made uniform, 2) Holes do not occur on the pattern, and 3) Short circuit of the pattern does not occur.

X-one or more of the above 1) to 3) appear.

2) Adhesion criterion:

The measurement standard was measured by the measuring method described in ASTM D3363-74.

3) Electric resistance:

Mitsubishi Chemical's model name MCP-T610 was used as the sheet resistance meter, and the resistance was measured by directly contacting the printed circuit board using a 4 pin probe.

TABLE 2

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Printability O O O O X Adhesion 4H 3H 4H 2H - Electrical resistance ≤0.5 Ω / □ ≤0.6 Ω / □ ≤0.5 Ω / □ ≤20 Ω / □ -

From the results in Table 2, in the case of the present application, including the conductive metal powder and the conductive fine particles having a specific particle diameter in the black conductive paste composition, it can be confirmed that it is superior in electrical resistance and adhesive strength than the comparative example. In Comparative Example 1, the adhesive strength and electrical resistance were poor, and in Comparative Example 2, the evaluation of the characteristic value was impossible due to the poor printability.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and a person skilled in the art does not depart from the spirit and scope of the present invention described in the above-described range and the appended claims. It will be appreciated that various changes and modifications can be made within the scope of the invention.

1 is a schematic perspective view of an electromagnetic shielding filter according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view taken along the line II-II of FIG. 1.

FIG. 3 is a schematic diagram illustrating a method of manufacturing the electromagnetic shielding filter of FIG. 1.

4 is a schematic perspective view of a display device including the filter for shielding electromagnetic waves of FIG. 1.

FIG. 5 is a partial cross-sectional view taken along the line V-V of FIG. 4.

Claims (29)

a) polymer resin and monomer or oligomer, b) solvent, c) glass powder, d) conductive material and e) black pigment, The conductive material is a black conductive paste composition comprising a conductive metal powder having an average particle diameter of 0.5 to 5㎛ and conductive fine particles having an average particle diameter of 0.02 to 0.09㎛. The black conductive paste composition according to claim 1, which is a printing composition for producing an electromagnetic shielding filter. The black conductive paste composition according to claim 1, which is a printing composition for offset printing on a glass substrate and low temperature baking at 400 to 550 ° C. for 15 to 30 minutes to produce an electromagnetic wave shielding filter. The method according to claim 1, comprising 5 to 15 parts by weight of the polymer resin and the monomer or oligomer, 5 to 15 parts by weight of the solvent, 1 to 10 parts by weight of the glass powder, 50 to 90 parts by weight of the conductive material and 1 to 10 parts by weight of the black pigment. , The weight ratio of the polymer resin and the monomer or oligomer is 10:90 to 90:10, black conductive paste composition. The black conductive paste composition according to claim 1, wherein the conductive material contains 3 to 25 parts by weight of the conductive fine particles with respect to 100 parts by weight of the conductive metal powder. The black conductive paste composition of claim 1, wherein the conductive metal powder and the conductive fine particles include one selected from the group consisting of silver, copper, nickel, gold, platinum, and alloys thereof. The black conductive paste composition of claim 1, wherein the conductive metal powder has a specific surface area of 0.5 to 4.5 m 2 / g. The black conductive paste composition according to claim 1, wherein the conductive fine particles have a specific surface area of 3 to 50 m 2 / g. The composition of claim 1, wherein the composition is a modified acrylic block copolymer, an alkylol ammonium salt polymer, a block copolymer containing a base pigment affinity group, an acrylic block copolymer, a fluorinated alkyl oligomer, a polyether modified dimethylpolysiloxane copolymer and a modified poly Black conductive paste composition further comprises 0.05 to 1 part by weight of at least one dispersant selected from the group consisting of urethanes. The black conductive paste composition of claim 1, wherein the composition comprises at least one binder selected from the group consisting of acrylate, cellulose derivative, polyvinyl alcohol and polyvinyl butyral. The black conductive paste composition of claim 1, wherein the black pigment comprises a cobalt, copper, rudenium, manganese, nickel, chromium, or iron-based compound. The black conductive paste composition of claim 11, wherein the black pigment comprises a cobalt-based compound. The black conductive paste composition of claim 11, wherein the black pigment further comprises an auxiliary pigment of copper, rudenium, manganese, nickel, chromium, or iron. The method of claim 1, The polymer resin has a weight average molecular weight of 5,000 to 100,000 methyl acrylate, butyl methacrylate, hydroxyethyl methacrylate, methyl methacrylate, ethyl acrylate, ethylhexyl acrylate, nonyl acrylate and methacryl thereof At least one polymer selected from the group consisting of two or more copolymers or a cellulose derivative, polyvinyl alcohol or polyvinyl butyral, The monomer or oligomer is one or more selected from the group consisting of an acrylate compound, an alkoxylate compound, dimethyl sulfoxide and an unsaturated polyester compound, black conductive paste composition. The black conductive paste composition according to claim 1, wherein the solvent comprises at least one or more types of high boiling point solvents having a boiling point of 200 ° C or higher and at least one or more types of low boiling point solvents having a boiling point of less than 200 ° C. The black conductive paste composition of claim 15, wherein the high boiling point solvent comprises at least one solvent selected from the group consisting of gamma butyrolactone, butyl carbitol acetate, carbitol, methoxymethyl ether propionate and tepinol. The low boiling point solvent is propylene glycol monomethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol monomethyl ether, dipropylene glycol monomethyl ether, propylene glycol monomethyl ether propionate, ethyl ether propio. A black conductive paste composition comprising at least one solvent selected from the group consisting of nates, propylene glycol monomethyl ether acetate, methyl ethyl ketone and ethyl lactate. The black conductive paste composition of claim 15, wherein the solvent comprises 12 to 88 wt% of the high boiling point solvent and 12 to 88 wt% of the low boiling point solvent. The glass powder according to claim 1, wherein the glass powder is a glass powder containing a Pb-based powder, a Pb-free powder, a colored glass powder prepared by mixing black or colored pigments, and a colored component of V ₂ O ₅ . Black conductive paste composition selected from the group consisting of one or more. A glass substrate, and An electromagnetic shielding member formed in a mesh shape on the glass substrate, The electromagnetic wave shielding filter is formed by printing the black conductive paste composition according to any one of claims 1 to 19 on the glass substrate and baking at a low temperature. 21. The electromagnetic shielding filter according to claim 20, wherein the electromagnetic shielding member is formed by offset printing the black conductive paste composition and baking at a low temperature of 400 to 550 ° C. for 15 to 30 minutes. The method of claim 20, wherein the electromagnetic shielding member, At least one first shield extending in one direction, And at least one second shield intersecting the first shield. The method of claim 22, The electromagnetic shielding member has an polygonal opening, the opening is chamfered filter. The method of claim 23, And all sides forming the polygon are substantially equal in length to each other. The method of claim 24, And said polygon is substantially square. The method of claim 22, And an edge layer formed along an edge of the glass substrate, wherein the electromagnetic shielding member is formed on the edge layer. The method of claim 26, And a grounding member connected to an end of the electromagnetic shielding member to ground the electromagnetic shielding member. Glass substrate, An electromagnetic shielding member formed in a mesh shape on the glass substrate, and A display panel that displays an image and faces the glass substrate, The electromagnetic shielding member is applied to shield electromagnetic waves emitted from the display panel, and the black conductive paste composition according to any one of claims 1 to 19 is offset-printed on the glass substrate for 15 minutes at 400 to 550 ° C. Display apparatus formed by low-temperature baking for 30 minutes. The method of claim 28, The display panel is a plasma display panel.

Images