KR20100077849A - Composition for electrode of plasma display panel - Google Patents

Abstract

The present invention provides a composition for a plasma display panel electrode comprising a conductive material and a binder, wherein the binder provides a composition for a plasma display panel electrode having a molecular weight of 40000 to 100000 and an acid value of 150 to 200 mgKOH / g.

Description

Composition for electrode for plasma display panel {Composition For Electrode Of Plasma Display Panel}

The present invention relates to a composition for plasma display panel electrodes.

In general, a plasma display panel (Plasma Display Panel) is a unit cell is formed by each of the upper and lower dielectric formed on the front substrate and the rear substrate and a barrier rip formed between the front substrate and the rear substrate, each cell The inside is filled with a gas such as neon (Ne), helium (He) or a mixture of neon and helium (Ne + He), and an inert gas containing a small amount of xenon (Xe).

Therefore, when discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image. Such plasma display panels are not only easy to thin and large in size, but also greatly improved as a result of recent technology developments, and thus are attracting attention as next generation display devices.

The electrode of the plasma display panel is connected to a driver IC package such as a tape carrier package (TCP) by an anisotropic conductive film at a terminal portion of the plasma display panel. In this case, if the printing characteristics of the plasma display panel electrode are not good, problems such as a poor signal of the electrode may occur at the terminal portion of the plasma display panel.

The present invention provides a composition for a plasma display panel electrode having improved printing characteristics.

In order to achieve the above object, the composition for a plasma display panel electrode according to an embodiment of the present invention is a composition for a plasma display panel electrode comprising a conductive material and a binder, the binder has a molecular weight of 40000 to 100000, the acid value May be 150 to 200 mgKOH / g.

The binder may be included in 4 to 16 parts by weight based on 100 parts by weight of the total composition.

The composition further includes a glass frit, the glass frit may comprise a lead-free or flexible glass frit.

The flexible glass frit includes lead oxide (PbO), bismuth oxide (Bi ₂ O ₃ ), silicon oxide (SiO ₂ ), boron oxide (B ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ), zinc oxide (ZnO) And cerium oxide (CeO ₂ ) It may include any one or more selected from the group consisting of.

The lead-free glass frit is bismuth oxide (Bi ₂ O ₃ ), silicon oxide (SiO ₂ ), boron oxide (B ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ), zinc oxide (ZnO) and cerium oxide (CeO ₂₎ It may include any one or more selected from the group consisting of.

The glass frit may be included in an amount of 1 to 10 parts by weight based on 100 parts by weight of the total composition.

The conductive material may be any one selected from the group consisting of silver (Ag), aluminum (Al), gold (Au), copper (Cu), nickel (Ni), and chromium (Cr).

The conductive material may be included in an amount of 50 to 70 parts by weight based on 100 parts by weight of the total composition.

Therefore, the composition for a plasma display panel electrode of the present invention has an advantage of improving the printability of the electrode and improving reliability by preventing an electrical signal error from occurring.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram for describing a plasma display panel according to an exemplary embodiment.

Referring to FIG. 1, a plasma display panel includes a front panel 100 having a scan electrode 102 and a sustain electrode 103 formed on a front substrate 101, and a scan electrode described above on a rear substrate 111 forming a rear surface thereof. The rear panel 110 in which the plurality of address electrodes 113 are arranged so as to intersect the 102 and the sustain electrode 103 is positioned side by side with a predetermined distance therebetween.

In the front panel 100, a scan electrode 102 and a sustain electrode 103 are disposed in a discharge space, that is, to maintain discharge and light emission of the discharge cell. More specifically, the scan electrodes 102 and the sustain electrodes 103 including the transparent electrodes 102a and 103a formed of a transparent ITO material and the bus electrodes 102b and 103b made of an opaque metal material are included in pairs. The scan electrode 102 and the sustain electrode 103 are covered by one or more upper dielectric layers 104 that limit the discharge current and insulate the electrode pairs. A protective layer 105 on which magnesium oxide (MgO) is deposited is disposed on the upper dielectric layer 104 to facilitate discharge conditions.

The rear panel 110 includes a plurality of discharge spaces, that is, a closed type partition wall 112 of a well type or stripe type for partitioning discharge cells. Also, a plurality of address electrodes 113 are provided for supplying data pulses.

In the plurality of discharge cells partitioned by the partition wall 112, the phosphor layer 114 for emitting visible light for image display during address discharge, preferably red (R), green (G). A blue (B) phosphor layer is located.

The lower dielectric layer 115 is positioned between the address electrode 113 and the phosphor layer 114.

Here, the electrode according to the embodiment of the present invention may be used as an address electrode or a bus electrode in the plasma display panel.

In FIG. 1, only an example of the plasma display panel is shown and described, and the present invention is not limited to the plasma display panel having the structure of FIG. 1. For example, although the scan electrode 102, the sustain electrode 103, and the address electrode 113 are formed in the plasma display panel 100 of FIG. 1, the scan electrode 102 is formed in the plasma display panel of the present invention. At least one of the sustain electrode 103 and the address electrode 113 may be omitted.

In addition, in FIG. 1, only the case where the partition wall 112 for partitioning the discharge cells is formed on the rear substrate 111 is illustrated. Alternatively, the partition wall 112 may be formed on the front substrate 101. It may be formed on the front substrate 101 and the rear substrate 112, respectively.

The composition for a plasma display panel electrode according to the exemplary embodiment of the present invention includes a conductive material and a binder, and the binder may have a molecular weight of 40000 to 100000 and an acid value of 150 to 200 mgKOH / g.

Hereinafter, a composition for a plasma display panel electrode according to an embodiment of the present invention will be described in detail.

The electrode composition of the plasma display panel according to an embodiment of the present invention may include a conductive material, a glass frit, a binder, a monomer, an initiator, an additive, and a solvent.

The composition for a plasma display panel electrode according to an embodiment of the present invention may include a conductive material. The conductive material may be one or more selected from the group consisting of silver (Ag), aluminum (Al), gold (Au), copper (Cu), nickel (Ni), and chromium (Cr). Among these, silver (Ag), which is inexpensive and does not cause a decrease in conductivity due to oxidation, may be used.

Herein, the conductive material may have an average particle diameter of 0.1 to 10 μm in consideration of light transmittance and precise pattern formation.

The conductive material may be included in an amount of 50 to 70 parts by weight based on 100 parts by weight of the composition for a plasma display panel electrode. Here, if the content of the conductive material is 50 parts by weight or more, it is possible to prevent the line width of the conductive film from shrinking and disconnecting during the subsequent firing step, and if it is 70 parts by weight or less, there is an advantage of preventing the light transmittance from being lowered.

The composition for a plasma display panel electrode according to an embodiment of the present invention may include a glass frit.

The glass frit serves to impart adhesion between the electrode and the substrate, and may use a flexible glass frit including lead oxide (PbO). Alternatively, the glass frit may use a lead-free glass frit containing no lead oxide (PbO). Can be.

The flexible glass frit includes lead oxide (PbO), bismuth oxide (Bi ₂ O ₃ ), silicon oxide (SiO ₂ ), boron oxide (B ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ), zinc oxide (ZnO) And cerium oxide (CeO ₂ ).

On the other hand, the lead-free glass frit is bismuth oxide (Bi ₂ O ₃ ), silicon oxide (SiO ₂ ), boron oxide (B ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ), zinc oxide (ZnO) and cerium oxide ( CeO ₂ ).

The glass frit may be included in an amount of 1 to 10 parts by weight based on 100 parts by weight of the composition for a plasma display panel electrode. Here, when the glass frit is 1 part by weight or more based on 100 parts by weight of the composition for the plasma display panel electrode, it is possible to provide an adhesive force between the substrate and the electrode, and the glass frit is 10 parts by weight based on 100 parts by weight of the composition for the plasma display panel electrode. It is an advantage that it can prevent that electroconductivity of an electrode falls that it is negative or less.

The glass frit may have a particle diameter of 0.1 to 10 μm.

The composition for a plasma display panel electrode according to an embodiment of the present invention may include a binder.

As the binder, an acrylic resin, a styrene resin, a novolak resin, a polyester resin, or the like, which is commonly used, may be used.

Here, it is preferable to use binder materials having a molecular weight of 40000 to 100000 and an acid value of 150 to 200 mgKOH / g for high resolution. Here, if the molecular weight of the binder is 40000 or more, the acid value is 150mgKOH / g or more, there is an advantage that the printing characteristics can be improved when printing the composition for the electrode later, the molecular weight of the binder is 100000 or less, the acid value is 200mgKOH / If it is less than or equal to g, there is an advantage in that the problem of poor printing due to too high a viscosity when printing the composition for an electrode later.

The binder may be included in an amount of 4 to 16 parts by weight based on 100 parts by weight of the total electrode composition.

The composition for a plasma display panel electrode according to an embodiment of the present invention may include a monomer.

The monomers are, for example, 2-hydroxy ethyl acrylate, 2-hydroxy propyl acrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, polyurethane Diacrylate, trimethylol propane triacrylate, pentaerythreat triacrylate, pentaerythreat tetra acrylate, trimethylol propane ethylene oxide modified triacrylate, trimethylol propane propylene oxide modified triacrylate, dipenta Erythritol penta acrylate, dipenta erythrite hexa acrylate and methacrylates corresponding to the acrylate, and polybasic acids such as phthalic acid, adipic acid, maleic acid, ataconic acid, succinic acid, trimellitic acid and terephthalic acid; (Mono-, di-, tree- or On) the hydroxyalkyl may be any one or more selected ones of the listed substances, such as acrylate.

The monomer may be included in 4 to 16 parts by weight based on 100 parts by weight of the total electrode composition.

The composition for a plasma display panel electrode according to an embodiment of the present invention may include a solvent.

As a solvent, for example, ethyl carbitol, butyl carbitol, ethyl carbitol acetate, butyl carbitol acetate, texanol, terpin oil, dipropylene glycol methyl ether, dipropylene glycol ethyl ether, dipropylene glycol monomethyl ether Any one or more selected from the group consisting of acetate, cellosolve acetate, butyl cellosolve acetate, and tripropylene glycol can be used.

The solvent may be included in an amount of 6 to 24 parts by weight based on 100 parts by weight of the total electrode composition.

The composition for a plasma display panel electrode according to an embodiment of the present invention may further include an additive. The additives may include antioxidants, thickeners to improve viscosity, dispersants to improve dispersibility, and the like.

The composition for a plasma display panel electrode according to an embodiment of the present invention may further include a photoinitiator.

The photoinitiator may be a substance that generates radicals during the exposure process, and for example, benzoin and benzoin alkyl ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether, and benzoin isopropyl ether. And acetophenones such as acetophenone, 2,2-dimethoxy-2-phenyl acetophenone, 2,2-diethoxy-2-phenyl acetophenone, and 1,1-dichloro acetophenone; 2-methyl-1 Amino such as-[4- (methylthio) phenyl] -2-morpholino propane-1-one and 2-benzyl-2-dimethylamino-1- [4-morpholinophenyl] -butan-1-one Acetophenones, anthraquinones, such as 2-methyl anthraquinone, 2-ethyl anthraquinone, 2-t-butyl anthraquinone, and 1-chloro anthraquinone, and 2,4-dimethyl thioxanthone, 2,4 Thioxanthones such as diethyl thioxanthone, 2-chloro thioxanthone, 2,4-diisopropyl thioxanthone, ketones such as acetophenone dimethyl ketal and benzyl dimethyl ketal , Benzophenones such as benzophenone, crantones, (2,6-dimethoxybenzoyl) -2,4,4-pentyl phosphine oxide, bis (2,4,6-trimethylbenzoyl)- Phosphine oxides and peroxides such as phenyl phosphine oxide, 2,4,6-trimethyl benzoyl diphenyl phosphine oxide, ethyl-2,4,6-trimethyl benzoyl phenyl phosphinate, and selected from these. Any one or more can be used.

Hereinafter, a method of manufacturing an electrode using the composition for a plasma display panel electrode according to an embodiment of the present invention will be described.

First, a conductive material, a glass frit, a binder, a monomer, an additive, and a photoinitiator are dispersed in a solvent to prepare a composition for an electrode. In this case, the dispersion may be a kneader such as a roll kneader, a mixer, a homo mixer, a ball mill, a bead mill, or the like.

The mixed electrode composition is coated on a substrate and then dried to form a conductive film. At this time, the coating process for coating the composition for the electrode on the substrate may be screen printing method, roll coater method, blade coater method slit coater method, curtain coater method, wire coater method and the like, the drying process for drying the electrode composition It may be performed at 50 to 150 degrees for 1 to 30 minutes.

At this time, the conductive film formed on the substrate may be made of a thickness of 5 to 30㎛.

Next, the mask on which the predetermined pattern was formed is exposed on the surface of the conductive film formed on the board | substrate. In this case, the exposure may use visible light, ultraviolet rays, far ultraviolet rays, and the like.

Subsequently, the exposed conductive film is developed to form an electrode pattern. At this time, the developer that can be used to develop the conductive film is lithium hydroxide, sodium hydroxide, potassium hydroxide, sodium hydrogen phosphate, diammonium phosphate, dipotassium hydrogen phosphate, disodium hydrogen phosphate, ammonium dihydrogen phosphate, potassium dihydrogen phosphate, dihydrogen phosphate An aqueous solution containing a base such as sodium, lithium silicate, sodium silicate, potassium silicate, lithium carbonate, sodium carbonate, potassium carbonate, lithium borate or sodium borate can be used.

Next, the electrode pattern formed on the substrate is fired to remove the organic material except the conductive material and the glass frit in the electrode pattern, thereby manufacturing the plasma display panel electrode according to the exemplary embodiment.

In this case, the process of firing the electrode pattern may be performed for 10 minutes to 3 hours at 400 to 600 degrees in the air.

Hereinafter, an embodiment according to a method of manufacturing an electrode of a plasma display panel according to an embodiment of the present invention. However, the following examples are only preferred embodiments of the present invention, and the present invention is not limited to the following examples.

≪ Example 1 >

50 g of silver as a conductive material, 15 g of butyl carbitol and butyl carbitol acetate mixtures, 7 g of trimethylolpropane ethoxylate triacrylate (TMPEOTA) as a monomer, 3 g of trimethylbenzoyl diphenylphosphol oxide as a photoinitiator, BYK352 as an additive 7 g of a mixture of malonic acid, 3 g of glass frit, and 15 g of a binder were mixed to prepare an electrode composition.

In this case, the glass frit has a content of 30 g of lead oxide (PbO), 10 g of boron oxide (B 2 O 3), 7.5 g of silicon oxide (SiO 2), and 2.5 g of aluminum oxide (Al 2 O 3), and has a glass transition point of 445 ° C. and an average particle diameter. The thing of 1.6 micrometers was used.

In addition, the binder used an acrylic resin having a molecular weight of 20000 and an acid value of 100 mgKOH / g.

The prepared composition for electrodes was degassed after filtering using a mesh filter.

Thereafter, the prepared electrode composition was printed on the organic substrate using a screen printing machine to a thickness of 20 μm, and then dried at 110 degrees in an IR oven. Then, the dried substrate was exposed to an energy of 150 mJ with UV of 365 nm, and then developed with 0.3 wt% sodium carbonate aqueous solution to form an electrode pattern on the substrate. Subsequently, the substrate on which the electrode pattern was formed was dried at a temperature of 120 degrees, and fired at a temperature of 560 degrees in air to form an electrode on the substrate.

<Example 2>

The electrode was formed under the same conditions as in Example 1 except that an acrylic resin having a molecular weight of 40000 and an acid value of 100 mgKOH / g was used as the binder material.

<Example 3>

An electrode was formed under the same conditions as in Example 1, except that an acrylic resin having a molecular weight of 20000, an acid value of 100 mgKOH / g, and an acrylic resin mixture of a molecular weight of 40000 and an acid value of 100 mgKOH / g was used as the binder material.

<Example 4>

An electrode was formed under the same conditions as in Example 1 except that an acrylic resin having a molecular weight of 40000 and an acid value of 150 mgKOH / g was used as the binder material.

The development of the plasma display panel electrode manufactured according to Examples 1 to 4, the viscosity ratio and the area of printing defects were observed and are shown in Table 1 below.

Molecular Weight and Acid Value of Binder Symptoms Viscosity ratio Bad print area (㎠) Example 1 Molecular weight 20000, acid value 100 ○ 1.11 5 Example 2 Molecular weight 40000, acid value 100 × 1.23 0 Example 3 Molecular Weight 20000, Acid Value 100 +
Molecular weight 40000, acid value 100
mixture ○ 1.15 2 Example 4 Molecular weight 40000, acid value 150 ○ 1.25 0

Referring to Table 1, the development of the electrode formed by the composition for a plasma display panel electrode according to the embodiments of the present invention, the viscosity ratio and the poor print area as follows.

It can be seen that the electrode manufactured by Experimental Example 4 uses a binder having a molecular weight of 40000 and an acid value of 150 mgKOH / g, which is easy to develop and does not cause poor printing.

However, the electrode prepared according to Experimental Example 1 to Experimental Example 3 has a molecular weight or acid value of 40000 to 100000 molecular weight, using an acid value of the binder outside the range of 150 to 200mgKOH / g, does not develop or poor printing It can be seen that.

Therefore, the electrode manufactured by the composition for a plasma display panel electrode according to an embodiment of the present invention by using a binder having a molecular weight of 40000 to 100000 and an acid value of 150 to 200mgKOH / g, easy development and poor printing There is an advantage in that it is possible to manufacture a highly reliable plasma display panel electrode.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

1 illustrates a plasma display panel according to an exemplary embodiment of the present invention.

Claims (8)

In the composition for a plasma display panel electrode comprising a conductive material and a binder, The binder has a molecular weight of 40000 to 100000, the acid value of 150 to 200mgKOH / g composition for a plasma display panel electrode. The method of claim 1, The binder is a composition for a plasma display panel electrode containing 4 to 16 parts by weight based on 100 parts by weight of the total composition. The method of claim 1, The composition further comprises a glass frit, The glass frit composition for a plasma display panel electrode comprising a lead-free or flexible glass frit. The method of claim 3, wherein The flexible glass frit includes lead oxide (PbO), bismuth oxide (Bi ₂ O ₃ ), silicon oxide (SiO ₂ ), boron oxide (B ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ), zinc oxide (ZnO) And cerium oxide (CeO ₂ ). The method of claim 3, wherein The lead-free glass frit is bismuth oxide (Bi ₂ O ₃ ), silicon oxide (SiO ₂ ), boron oxide (B ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ), zinc oxide (ZnO) and cerium oxide (CeO ₂₎ Plasma display panel electrode composition comprising any one or more selected from the group consisting of. The method of claim 3, wherein The glass frit is a composition for a plasma display panel electrode is included in 1 to 10 parts by weight based on 100 parts by weight of the total composition. The method of claim 1, The conductive material is any one selected from the group consisting of silver (Ag), aluminum (Al), gold (Au), copper (Cu), nickel (Ni) and chromium (Cr). The method of claim 1, The conductive material is a composition for a plasma display panel electrode containing 50 to 70 parts by weight based on 100 parts by weight of the total composition.

Images