KR20010001457A - Composition for MgO layer of plasma dispaly panel - Google Patents

Abstract

PURPOSE: The titled composition capable of preventing coagulation between MgO particles after dispersion and lowering of transmissivity by light scattering at the same time and comprising MgO, an alcohol solvent for dispersing the same and an amide group-containing organic base is provided, which makes it possible to form a MgO film having excellent dispersibility. CONSTITUTION: This composition comprises MgO, an alcohol solvent for dispersing the same and an amide group-containing organic base in a weight ratio of the solvent to organic base of 3 : 1 to 2 : 1, wherein the total amount of the alcohol solvent and the amide group-containing organic base is 4 to 10 parts by weight based on 1 parts by weight of the MgO. The amide group-containing organic base is one selected from the group consisting of N,N-dimethylformamide, N,N-diethylformamide, N,N-dimethylacetamide, N,N-diethylacetamide, formamide, N-bromoacetamide, chloroacetamide, fluoroacetamide, acetamide, N-methylformamide, acrylamide, propionamide, cyanoacetamide, chloral formamide, n-butyramide, isovaleramide, cyanoamide, thioformamide, thioacetamide and dicyanodiamide.

Description

Composition for MgO film formation of plasma display panel {Composition for MgO layer of plasma dispaly panel}

The present invention relates to a composition for forming a MgO film of a plasma display panel, and more particularly, to a composition for forming a MgO film of a plasma display panel with improved dispersibility of MgO particles.

A typical plasma display panel is an apparatus for forming an image by phosphors excited by light emission or discharge by plasma discharge, and applying a predetermined voltage to two electrodes installed in the discharge space of the plasma display panel so that plasma discharge occurs between them. Then, the phosphor layer formed in a predetermined pattern is excited by the ultraviolet rays generated during the glow discharge so that an image is formed. Such plasma displays are roughly classified into an AC type, a DC type, and a hybrid type.

1 is a cross-sectional view showing the structure of a conventional AC plasma display panel.

Referring to this, a general plasma display panel includes a rear substrate 10, a first electrode 11 which is an address electrode formed on the rear substrate 10, and a rear substrate 10 on which the first electrode 11 is formed. The dielectric layer 12 formed thereon and a plurality of partitions 13 formed on the dielectric layer 12 to maintain a discharge distance and to prevent electro-optical crosstalk between cells.

In addition, the second electrode 16 is formed on the front substrate 15 to be orthogonally spaced apart from the first electrode 11 formed on the rear substrate 10 at a predetermined interval. A color filter layer 17 is formed on the front substrate 15 on which the second electrode 16 is formed, and the second electrode 16 and the color filter layer 17 are immersed on the color filter layer 17. The dielectric layer 18 and the protective film 19 which are present are sequentially formed.

The phosphor layer 14 is formed on one side of the partition 13 and the upper surface of the dielectric layer 12 exposed therebetween.

On the other hand, MgO is generally used as the material for forming the protective film 19. MgO is very useful as a protective film forming material here because it not only functions to protect the electrode, but also assists in discharge by emission of secondary electrons.

The MgO film used as a protective film is conventionally formed using the E-beam vapor deposition method. However, in the case of using the E-beam evaporation method as described above, it is possible to obtain an MgO film having excellent transparency and crystallinity, but there is a problem in that productivity is reduced because an expensive vacuum deposition apparatus is required and manufacturing time is long.

In order to solve this problem, a method of spin coating MgO has been proposed. In the case of using the spin coating method as described above, the manufacturing process time is reduced and the equipment cost can be greatly reduced.

On the other hand, the dispersibility of MgO has a very important effect on the film properties of the MgO film, and ultimately affects the properties of the plasma display panel. The dispersibility of MgO here is directly related to the particle size distribution characteristic of the MgO particles, which depends on the solvent system used in dispersing the MgO particles.

Conventionally, water was mainly used as a dispersion medium of MgO. However, in the case of dispersing MgO using water as described above, there is a problem in that the phenomenon of reaggregation of MgO particles occurs after dispersion.

In order to solve this problem, a method of using an organic solvent or an acid during dispersion has been proposed. However, when an organic solvent is used as the dispersion medium, a long time is required for the dispersion process, and when an acid is used, MgO is dissolved in an acid, which is not preferable.

Therefore, the technical problem to be achieved by the present invention is to provide a composition for forming a MgO film of the plasma display panel that can solve the above problems to prevent reaggregation between MgO particles after dispersion and to prevent a decrease in permeability due to light scattering.

1 is a cross-sectional view showing the structure of a conventional AC plasma display;

2 is a view showing the MgO average particle diameter distribution state before and after dispersion in the composition for MgO film formation according to Example 1 of the present invention.

<Explanation of symbols for main parts of drawing>

10 ... back substrate 11 ... first electrode

12, 18 ... dielectric layer 13 ... bulkhead

14 ... phosphor layer 15 ... front substrate

16. Second electrode 17 ... Color filter layer

19 ... Shield

In order to achieve the above technical problem, the present invention provides a composition for forming a MgO film of a plasma display panel comprising MgO, an alcohol solvent for dispersing the same, and an amide group-containing organic base.

In the present invention, an alcoholic organic solvent and an amide group-containing organic base are used as the dispersion medium of MgO. Herein, the mixing weight ratio of the alcohol organic solvent and the amide group-containing organic solvent is preferably 3: 1 to 2: 1. If the content of the amide group-containing organic base in the alcoholic organic solvent is outside the above range, it is not preferable because the dispersion efficiency is lowered. The total content of the dispersion medium including the organic solvent and the amide group-containing organic salt is preferably 4 to 10 parts by weight based on 1 part by weight of MgO. In the case where the content of the dispersion medium is outside the above range, it is not preferable in terms of the dispersion efficiency of MgO.

When MgO is disperse | distributed using the above-mentioned dispersion medium, the average particle diameter of MgO is adjusted to 200 nm or less, Preferably it is 130 nm or less. In the case where the average particle diameter of MgO is more than 200 nm, transmittance characteristics are deteriorated due to scattering of visible light, which is not preferable.

The alcohol organic solvent of the present invention is not particularly limited, and specific examples thereof include isopropyl alcohol, ethanol, methanol and the like. And amide group-containing organic bases include N, N-dimethylformamide, N, N-diethylformamide, N, N-dimethylacetamide, N, N-diethylacetamide, formamide, and N-bromoacet. Amide, chloroacetamide, floroacetamide, acetamide, N-methylformamide, acrylamide, propionamide, cyanoacetamide, chloral formamide, n-butyra Using one or more selected from n-butyramide, isovaleramide, cyanamide, thioformamide, thioacetamide and dicyanodiamide, Among them, N, N-dimethylformamide and N, N-dimethylacetamide are more preferable.

Hereinafter, the present invention will be described in detail with reference to the following examples, but the present invention is not limited to the following examples.

Example 1

To the paint shaker was added 10 parts by weight of MgO with an average particle diameter of 50 nm, 65 parts by weight of ethanol, 25 parts by weight of N, N-dimethylformamide and a zirconia ball with a particle diameter of 0.2 mm, which were then milled. (milling).

After 2 hours, the resultant was filtered to prepare a composition for MgO film formation. The composition was spin coated to form an MgO film for plasma display panel (PDP).

Example 2

The MgO film for PDP was formed in the same manner as in Example 1 except that isopropyl alcohol was used instead of ethanol.

Example 3

A MgO film for PDP was formed in the same manner as in Example 1 except that N, N-dimethylacetamide was used instead of N, N-dimethylformamide.

Comparative Example 1

10 parts by weight of MgO having an average particle diameter of 50 nm, 90 parts by weight of water, and a zirconia ball having a particle diameter of 0.2 mm were added to a ball mill, and then milled. After 2 hours, the resultant was filtered to prepare a composition for MgO film formation. Subsequently, this composition was spin-coated to form an MgO film for PDP.

Comparative Example 2

Except for using 90 parts by weight of ethanol instead of 90 parts by weight of water, the same procedure as in Comparative Example 1 was carried out to form a MgO film for PDP.

The particle size distribution of MgO in the composition for forming a MgO film prepared according to Example 1-3 was examined and shown in FIG. 2. Here, the particle size distribution of MgO was measured using zeta-master.

As a result, as shown in FIG. 2, the average particle diameter of MgO decreased to 357 nm before dispersion and to 135 nm after dispersion. From these results, it was confirmed that the dispersibility of MgO is very excellent.

On the other hand, the MgO film-forming composition prepared according to Comparative Example 1 was excellent in dispersibility with an average particle diameter of 250 nm immediately after dispersion, but after about 1 hour, the phenomenon of MgO particles was reaggregated. As in the case of Comparative Example 2, when only an organic solvent such as ethanol was used as the dispersion medium, the dispersion time was about 3 days.

By using the composition for MgO film formation of this invention, MgO can be disperse | distributed in the state whose average particle diameter is 200 nm or less. Therefore, the permeability characteristic can be prevented from falling by light scattering. In addition, the MgO particles can be prevented from reaggregating after dispersion to form an MgO film having excellent dispersibility.

Claims (5)

A composition for forming a MgO film of a plasma display panel, comprising MgO, an alcohol solvent for dispersing the same, and an amide group-containing organic base. 2. The composition for forming a MgO film of a plasma display panel according to claim 1, wherein the mixed weight ratio of the alcohol solvent and the amide group-containing organic base is 3: 1 to 2: 1. The composition for forming a MgP film of a plasma display panel according to claim 1, wherein the total content of the alcohol solvent and the amide group-containing organic base is 4 to 10 parts by weight based on 1 part by weight of MgO. The method according to claim 1, wherein the amide group-containing organic base is N, N-dimethylformamide, N, N-diethylformamide, N, N-dimethylacetamide, N, N-diethylacetamide, formamide, N-bromoacetamide, chloroacetamide, floroacetamide, acetamide, N-methylformamide, acrylamide, propionamide, cyanoacetamide, chloral formamide , n-butyramide, isovaleramide, cyanamide, thioformamide, thioacetamide and dicyanodiamide MgO film forming composition of the plasma display panel, characterized in that at least one selected from. The composition for forming a MgO film of a plasma display panel according to claim 1, wherein the average particle diameter of the dispersed MgO is 200 nm or less.