KR20090108781A - Black paste composition having conductivity property, filter for shielding electromagnetic interference and display device comprising the same - Google Patents

Abstract

PURPOSE: A conductive black paste composition is provided for use in producing a filter for shielding electromagnetic interference. CONSTITUTION: A conductive black paste composition comprises an acrylate polymer resin, monomer or oligomer, solvent, frit glass, conductive metal, and black pigment. A filter(100) for shielding electromagnetic interference comprises a glass substrate(20) and an electromagnetic interference shielding member(10). The electromagnetic interference shielding member is positioned on the glass substrate as a form of mesh. The electromagnetic interference shielding member is produced by printing the conductive black paste composition on the glass substrate, and sintering them.

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 electromagnetic wave shielding filters for display devices such as plasma display panels to prevent drying, to improve the quality of the pattern, to improve the printability and the continuous process, and to prevent the degradation of the appearance characteristics of the plasma display. The present invention relates to a conductive paste composition, an electromagnetic wave shielding filter 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. There is also a limit in reducing the thickness of the electromagnetic wave shielding filter to which the composition is applied.), And organic substances 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 conventional paste composition, part or all of the paste is exposed to the outside air during the offset process, so that the paste may be dried directly or indirectly under the influence of the outside air. At this time, the occurrence of drying may not occur evenly in a large area. Therefore, in the case of the conventional paste composition, when forming a pattern, mura, line width reduction, disconnection of a part, short circuit, and the like may be generated, which may result in deterioration of plasma display appearance characteristics.

Accordingly, the present invention is to provide a black conductive paste composition for electromagnetic shielding filter to prevent the drying during the application of the offset process to improve the plasma display appearance characteristics.

The present invention also provides a black conductive paste composition which enables the provision of an electromagnetic shielding filter excellent in dispersibility and printability.

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

In addition, the present invention is to provide a display device including an electromagnetic shielding member formed using the black conductive paste composition.

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

It provides a black conductive paste composition comprising 10 to 90 parts by weight of the monomer or oligomer based on the total of the acrylate polymer resin and the monomer or oligomer.

The black conductive paste composition is an electromagnetic wave shielding filter paste composition applied to a display device such as a plasma display panel. Preferably, the black conductive paste composition is printed (for example, offset printed) on a glass substrate and baked to display the black conductive paste composition. An electromagnetic wave shielding filter for a device can be provided.

The paste composition may include 5 to 15 parts by weight of acrylate 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 metal and 1 to 10 parts by weight of black pigment. Can be. 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 is formed by printing and baking the black conductive paste composition on the glass substrate. Provide a shielding filter.

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 and baking the black conductive paste composition on the glass substrate.

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 the continuous process, and also has excellent printability, dispersibility and optical properties, and a display device using the same. A method for providing an electromagnetic shielding filter.

As a result of the experiments of the present inventors, at least one specific monomer or oligomer may be included in the paste composition to maintain the viscosity, elasticity and fluidity of the paste composition at a desirable level, thereby facilitating the transition of the paste in the printing process. It was confirmed. In particular, when using the specific monomer or oligomer it was surprisingly found that it is possible to prevent the drying of the paste that can occur during the offset process to prevent the occurrence of stains and the like pattern. Therefore, the electromagnetic shielding filter formed by printing and firing a glass substrate using the black conductive paste composition of the present invention includes a mesh pattern having a constant shape, thickness, and line width, thereby improving the appearance of the plasma display, thereby improving the quality of the continuous process. Can improve.

In the black conductive paste composition of the present invention, as the acrylate polymer resin, methyl acrylate (MA), BM (butyl methacrylate, butyl methacrylate), HEMA (hydroxyethyl methacrylate, hydroxyethyl methacrylate), MMA (methylmethacrylate), ethyl acrylate (EA), ethylhexyl acrylate (ethylhexyl acrylate), nonyl acrylate (nonyl acrylate) and any one selected from the group consisting of methacrylate Polymers or two or more copolymers may be used. Preferably, as the acrylate polymer resin, methyl acrylate (MA), BM (butyl methacrylate, butyl methacrylate), HEMA (hydroxyethyl methacrylate, hydroxyl methacrylate), and MMA (methlmethacrylate, methyl Methacrylate) 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 optical performance. It plays a role in showing 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.

On the other hand, the black conductive paste composition according to the present invention can prevent drying of the paste by using an appropriate amount of at least one or more specific monomers or oligomers. In addition, the monomer or oligomer maintains the viscosity, elasticity and fluidity of the paste composition at a level suitable for patterning to facilitate the transition of the paste. At this time, the viscosity of the paste composition of the preferred level may be 1,000 to 30,000 cps, more preferably 3,000 to 15,000 cps.

Therefore, the pattern obtained by printing and firing on a glass substrate using the paste composition using the specific monomer or oligomer has a uniform shape, line width, thickness, etc., does not contain stains, and has excellent appearance characteristics. Can be greatly improved, and the continuous process can be improved.

Such monomers or oligomers preferably include one or more selected from the group consisting of acrylate compounds, alkoxylate compounds, dimethyl sulfoxide and unsaturated polyester compounds.

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), trimethyl At least one selected from the group consisting of all propane ethoxylate (20/3 EO / OH), trimethylolpropane propoxylate (1 PO / OH), dimethyl sulfoxide and unsaturated polyester. 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 the total 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 total amount of the acrylate polymer resin and the monomer or oligomer is preferably included in the total paste composition of 5 to 15 parts by weight. When the content of the acrylate 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. When the content of the acrylate polymer resin exceeds 15 parts by weight, the electrical resistance of the pattern formed from the paste composition is increased. This increasing problem can occur.

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 a boiling point of not less than 0 ° C may 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. Consideration should be given to the removal temperature of the organics and the improvement of the 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.

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 addition, in the black conductive paste composition, an electrode metal powder may be used as the conductive metal. More specifically, silver, copper, nickel, tin, or an alloy thereof may be used alone or in combination of one or more thereof.

The content of the conductive metal is preferably 50 parts by weight to 90 parts by weight in the total paste composition. When the content of the conductive metal exceeds 90 parts by weight, the viscosity of the paste composition is increased and the dispersion is difficult, so that the printing characteristics are decreased. When the content of the conductive metal is less than 50 parts by weight, the electromagnetic shielding filter for a display device is due to an increase in the electrical resistance of the pattern formed from the paste composition. The electromagnetic shielding performance required for the performance may be reduced.

In addition, the metal powder used as the conductive metal may preferably have an average particle size of 0.3 ~ 30㎛, more preferably an average particle size of 0.5 ~ 10㎛, most preferably an average of 0.5 ~ 5㎛ May have a particle size. If the metal powder has an average particle size of less than 0.3 μm, dispersion is difficult and the paste composition may have high viscosity or gelation, resulting in poor printing characteristics 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 30 μm, the metal powder is not uniformly filled in the pattern formed by printing the paste composition, which causes the electromagnetic wave shielding filter to have 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. Alternatively, if the metal powder has an average particle size of 0.3 to 30 μm, more preferably an average particle size of 0.5 to 10 μm, most preferably an average particle size of 0.5 to 5 μm, Printing characteristics and electromagnetic shielding performance can be further improved, and generation of holes in the pattern can be prevented.

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 total 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 the 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 and baking the above-described paste composition on a glass substrate, and preferably, 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 25 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, tin and nickel.

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 25 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), a 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 25 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, tin, 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 at least one binder resin selected from an acrylate resin, an acrylic resin, polyester, and polyurethane, and the monomer or oligomer described above. The solvent and the organic material 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 washed 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. 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 the plating bath, but since the glass substrate cannot be wound in the form of a roll, it is impossible to form the electromagnetic shielding member by plating the glass substrate. 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. 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 organic member 20 (shown in FIG. 5) is located above.

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 hard to recognize by 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, the black conductive paste composition of the present invention, as it comprises a specific monomer or oligomer, maintains the viscosity, elasticity and fluidity of the paste composition at a desirable level, thereby facilitating the transition of the paste in the offset printing process. In particular, drying can be prevented to prevent staining. Therefore, it is possible to provide an electromagnetic wave 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 appearance 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

To the composition and content shown in Table 1 below, the monomer or oligomer, the solvent, the glass powder, the conductive metal, the black pigment and the dispersant were stirred at room temperature in the acrylate polymer resin, and finally, the black conductive for the desired gravure offset printing using a 3-roll mill. A paste composition was prepared.

TABLE 1

Classification (parts by weight) Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Acrylate polymer resin 3 4 4 4.5 5.5 0.35 Monomer or oligomer 1 A B C D - B 1.5 2 2 1.5 - 5.15 Monomer or oligomer 2 B - - - - - 1.5 - - - - - BCA 7 7 7 7 7.7 7.5 MEDG 2.2 2.2 2.2 2.2 2.0 2.2 Dispersant 0.3 0.3 0.3 0.3 0.3 0.3 silver 75 75 75 75 75 75 Black powder 5.5 5.5 5.5 5.5 5.5 5.5 Glass powder 4 4 4 4 4 4

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.

In addition, A is urethane acrylate, B is trimethylolpropane triacrylate modified ethylene oxide, C is trimethylolpropane triacrylate modified propylene oxide, and D is bisphenol A ethoxylated dimethacrylate.

The BCA is butylcarbitol acetate, and MEDG is diethylene glycol methylethyl ether. The block copolymer containing a base pigment affinity group is DISPERBYK-2050 manufactured by BYK. The conductive metal is spherical silver powder and the average particle size is 1.5 mu m. The black pigment is Co. As the glass powder, Bi ₂ O ₃ -based glass powder was used.

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 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 process was maintained for 20 minutes at 500 ~ 540 ℃ to form the electromagnetic shielding filter mesh pattern.

(Characteristic Evaluation of Electromagnetic Shielding Filter)

The dispersibility, printability, and dryness of the electromagnetic wave shielding filter formed using the paste compositions of Examples 1-4 and Comparative Examples 1-2 were evaluated based on the following criteria, and the results are shown in Table 2 below. 6 to 8 show mesh pattern patterns formed on the electromagnetic wave shielding filters using the paste compositions of Examples 1-4 and Comparative Examples 1-2.

1) Dispersibility Criteria:

1) No separation of inorganic and organic materials, 2) no gelling, and 3) no particles agglomerated larger than the particle size of each component added to the paste composition in a mesh form pattern.

Gelation-2) gelation occurs.

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

2) 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.

3) drying criteria:

Anti-gun drying, pattern formation in order to evaluate the composition assisting apparatus (cover and gamut system) for 5 minutes and 10 minutes in a state exposed to the open air from the gravure roll ^state after removing ¹⁾ the progress of the doctor ring step, and then, ^{the main} printed ^{2) After the} doctoring, it was compared with the printed pattern.

Note 1) Doctoring process = filling the paste composition with a blade into the gravure pattern groove and removing the paste in the non-patterned part.

Note 2) The number of times of doctoring is one time when the position of the beginning of the pattern is changed again by rotating once at the beginning of the formed pattern of gravure roll.

○-After the doctoring process, after the doctoring process is performed with the printed pattern exposed to the outside air for 5 minutes and 10 minutes, the printed pattern is compared. 1) Pattern transfer is uniform. 2) Short circuit of the printed pattern. 3) There is no change in printing pattern form.

X-one or more of the above 1) to 3) is not properly implemented.

TABLE 2

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Dispersibility ○ ○ ○ ○ ○ ○ Printability ○ ○ ○ ○ ○ X Drying effect ○ ○ ○ ○ X ○

From the results of Table 2, the electromagnetic wave shielding filter using the compositions of Examples 1 to 5, in which the paste composition contains a specific dispersant, has much more dispersibility, printability, and drying prevention effect than the electromagnetic wave shielding filters of Comparative Examples 1 and 2. Excellent. However, Comparative Example 1 showed a poor drying prevention effect, Comparative Example 2 showed a poor printability.

6 to 8, when comparing the printing pattern after the doctoring once, the printing pattern after the doctoring for 5 minutes, and the printing pattern after the doctoring for 10 minutes, Examples 1 to 4 include exposure to the outside air according to the inclusion of a specific monomer. It can be confirmed that there is little change in pattern quality such as short circuit of the pattern due to drying by.

On the other hand, the paste composition using only the binder of Comparative Example 1 was confirmed that the short circuit and line width of the pattern is reduced by the continuous drying occurs. In addition, when the content of the monomer of Comparative Example 2 is too large, it was confirmed that the proper pattern due to lack of elasticity of the paste could not be formed.

4) Mura occurrence comparison

It was visually determined whether Mura occurred in the glass including the pattern using the paste composition of Comparative Example 1 and Example 1 and the results are shown in FIGS. 9A to 9C and 10A to 10B. That is, FIG. 9A is a photograph of a portion of a 50 "glass substrate including the pattern of Comparative Example 1. FIG. 9B is an enlarged photograph of the display portions 1 and 2 of FIG. 9A, and FIG. 9C is FIG. 9B. 10A is a photograph of a portion of a 50 "glass substrate including the pattern of Example 2. FIG. FIG. 10B is an enlarged photograph of the display portions 3 and 4 of FIG. 10A.

At this time, the determination of the occurrence of mura can be made by visual observation of the appearance of a stain on the glass substrate, where the comparison was judged under the following conditions.

<Mura observation conditions>

Observation of the staining of the 50 "glass substrate was visually observed using a white light source under dark conditions, and the results were compared and judged according to the following grades.

Grade A: No stains, clean.

Class B: Smudges appear weak

Grade C: stains are easily seen and stains are strongly formed.

When the printing process was performed using the paste composition using only the binder of Comparative Example 1 of FIGS. 9A to 9C, it can be seen that mura was largely displayed on the glass substrate. In Comparative Example 1, a stripe-like mura is observed on a glass substrate, and mura is easily observed on the substrate. Stripe-shaped mura occurrence occurs along the doctoring direction, which can be assumed to be in the form of stains as the doctoring state changes with the drying occurrence of the composition.

On the other hand, when using the monomer of Example 2 of Figure 10a, 10b, it can be seen that the generation of mura on the glass substrate is observed weakly. In addition, in Example 2 it can be seen that the occurrence of mura due to the drying of the paste composition is significantly reduced by the use of the monomer.

In conclusion, if a specific monomer or oligomer is appropriately used in the composition together with a cover preventing and drying system in the offset process as in the present invention, it is possible to minimize the drying in the continuous process to maintain the quality of the printing pattern. I could confirm it. However, the generation form and cause of the mura are not limited thereto, and various forms of mura may occur according to various causes such as a substrate, a composition, a printing process condition, and a variety of mura forms. It is specified here that Mura occurrence may be a kind of example.

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.

6 to 8 show electron micrographs of a mesh-shaped pattern formed on the electromagnetic shielding filters of Examples 1 to 4 and Comparative Examples 1 to 2, respectively.

9A is a photograph of a portion of a 50 ″ glass substrate including a pattern of Comparative Example 1. FIG.

FIG. 9B is an enlarged photograph of the display portions 1 and 2 of FIG. 9A.

FIG. 9C illustrates a photograph including the pattern portion of FIG. 9B.

FIG. 10A is a photograph of a portion of a 50 "glass substrate including the pattern of Example 2. FIG.

FIG. 10B is an enlarged photograph of the display portions 3 and 4 of FIG. 10A.

Claims (43)

a) acrylate polymer resin, b) monomer or oligomer, c) solvent, d) glass powder, e) conductive metal and f) black pigment, Black conductive paste composition comprising 10 to 90 parts by weight of the monomer or oligomer relative to the total of the acrylate polymer resin and the monomer or oligomer. 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 firing to produce an electromagnetic shielding filter. According to claim 1, 5 to 15 parts by weight of acrylate 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 metal and 1 to 10 parts by weight of black pigment. Black conductive paste composition comprising. The composition according to claim 1 or 4, 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. Black conductive paste composition further comprises 0.05 to 1 part by weight of at least one dispersant selected from the group consisting of a copolymer and a modified polyurethane. The black conductive paste composition of claim 1, wherein the monomer or oligomer comprises one or more selected from the group consisting of an acrylate compound, an alkoxylate compound, a dimethyl sulfoxide, and an unsaturated polyester compound. The method of claim 1, wherein the monomer or oligomer is methyl acrylate, methyl methacrylate, hydroxyethyl methacrylate, glycidyl methacrylate, butyl methacrylate, ethyl methacrylate, benzyl methacrylate, ethyl Triglycol methacrylate, nonyl acrylate, nonyl methacrylate, ethyl acrylate, ethyl methacrylate, ethylhexyl acrylate, ethylhexyl methacrylate, urethane acrylate, lauryl acrylate, oligoether acrylate acrylate), polyether acrylate compound, polyester acrylate compound, silicone acrylate, trimethylolpropane triacrylate, neopentyl glycol hydroxy pivalate modified caprolactone, polyethylene glycol dia Acrylate, polypropylene glycol diacrylate, tetraethylene glycol diacrylate, pentaerythritol triacylate, trimethylolpropane triacrylate modified ethylene oxide (modified EO), trimethylolpropane triacrylate modified Polypropylene oxide (modified PO), dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate modified caprolactone, ditrimethylolpropane Tetraacrylate, pentaerythritol tetraacrylate, pentaerythritol ethoxylated triacrylate, urethane methacrylate, lauryl methacrylate, oligoether methacrylate, polyether methacrylate System Water, polyester methacrylate type compound, silicone methacrylate, trimethylol propane trimethacrylate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, tetraethylene glycol dimethacrylate, pentaerythritol Trimethacrylate, trimethylolpropane trimethacrylate, dipentaerythritol hexamethacrylate, dipentaerythritol pentamethacrylate, ditrimethylolpropane tetramethacrylate, pentaerythritol tetramethacrylate , Pentaerythritol ethoxylated trimethacrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, bisphenol A ethoxylated dimethacrylate, trimethylolpropane ethoxylate (4/15 EO / OH) A black conductive paste composition, which is at least one selected from the group consisting of dimethylolpropane ethoxylate (20/3 EO / OH), trimethylolpropane propoxylate (1 PO / OH), dimethyl sulfoxide and unsaturated polyester. The method of claim 7, wherein the monomer or oligomer is selected from the group consisting of urethane acrylate, trimethylolpropane triacrylate modified ethylene oxide, trimethylolpropane triacrylate modified propylene oxide and bisphenol A ethoxylated dimethacrylate. A black conductive paste composition comprising at least a compound. 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 9, wherein the black pigment comprises a cobalt-based compound. The black conductive paste composition of claim 9, wherein the black pigment further comprises an auxiliary pigment of copper, rudenium, manganese, nickel, chromium or iron. The black conductive paste composition of claim 1, wherein the acrylate polymer resin has a weight average molecular weight of 5,000 to 100,000. 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 according to claim 13, 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 method of claim 13, wherein 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 13, 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 of claim 1, wherein the glass powder comprises a Pb-based powder, a Pb-free powder, a colored glass powder prepared by incorporating a black or colored pigment, and a glass powder containing a colored component of V ₂ O ₅ . Black conductive paste composition selected from the group of one or more. The black conductive paste composition of claim 1, wherein the conductive metal is a metal powder for an electrode selected from the group consisting of silver, copper, nickel, tin, and alloys thereof. The black conductive paste composition of claim 18, wherein the metal powder has an average particle size of 0.3 to 30 μm. 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 17 on the glass substrate and firing the same. 21. The electromagnetic shielding filter according to claim 20, wherein the electromagnetic shielding member is formed by offset printing and baking the black conductive paste composition. 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 filter of claim 1, wherein the first shield has a width greater than 0 and less than or equal to 50 µm. The method of claim 22, An electromagnetic wave shielding filter comprising a plurality of first shielding portions, wherein an average pitch of the plurality of first shielding portions is greater than 0 and 500 µm or less. The method of claim 22, An electromagnetic shielding filter having an angle of 60 ° to 120 ° formed by crossing the first shielding part and the second shielding part. The method of claim 25, Wherein said angle is substantially 90 [deg.]. The method of claim 22, The angle formed by one side of the first shielding portion and the glass substrate is 20 ° to 70 ° filter for electromagnetic shielding. The method of claim 20, The electromagnetic shielding member has an polygonal opening, the opening is chamfered filter. The method of claim 28, And all sides forming the polygon are substantially equal in length to each other. The method of claim 29, And said polygon is substantially square. The method of claim 20, 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 31, wherein 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, 20. The display device of claim 1, wherein 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 printed on the glass substrate and baked. The method of claim 33, wherein The display panel, A first substrate and a second substrate facing each other, and A black layer positioned between the first substrate and the second substrate Including, And the electromagnetic shielding member is three-dimensionally intersected with the black layer. The method of claim 33, wherein And the electromagnetic shielding member is in contact with the second substrate. The method of claim 33, wherein The electromagnetic shielding member is formed by offset printing and baking the black conductive paste composition. The method of claim 33, wherein The electromagnetic shielding member, At least one first shield extending in one direction, and And at least one second shield that crosses the first shield. The method of claim 37, wherein The first shielding portion has a width greater than 0 and less than or equal to 50 μm. The method of claim 37, wherein A display device comprising a plurality of first shields, wherein an average pitch of the plurality of first shields is greater than 0 and less than or equal to 500 μm. The method of claim 37, wherein The display device of claim 1, wherein an angle formed by the first shielding portion and the second shielding portion intersecting is 60 ° to 120 °. The method of claim 40, And the angle is substantially 90 [deg.]. The method of claim 37, wherein An angle formed by one side of the first shielding portion and the glass substrate is 20 ° to 70 °. The method of claim 33, wherein The display panel is a plasma display panel.

Images