KR100244242B1 - Dielectric of plasma display panel and manufacturing method thereof - Google Patents

Abstract

A dielectric of a plasma display panel, comprising: alkoxide having an chemical formula of M (OR) n (M: metal element, R: alkali group, n: number of metal oxides), an alcohol, a catalyst material, and a mixture thereof in a sol state After gelling in, the gelled mixture is coated onto the bottom plate. In addition, the coated mixture may be dried and heat-treated to form a low dielectric constant dielectric layer, thereby speeding up a signal transmission rate when driving the plasma display panel, thereby realizing an image at a low driving voltage.

Description

Dielectric of plasma display panel and manufacturing method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to plasma display panels, and more particularly to dielectrics of plasma display panels.

In general, a plasma display panel provides an image using light emitted from a plasma generated during gas discharge, and the discharged plasma is separated by a fine partition wall to form a unit cell, and the unit cell constituted by the minute partition wall By selectively emitting light by the driving circuit to realize an image.

FIG. 1 is a cross-sectional view illustrating a structure of a general plasma display panel. As shown in FIG. 1, a plasma display panel forms a storage electrode 2 on an upper plate 1 and an address electrode 4 on a lower plate 3. Next, the dielectric film 5 is coated on the upper and lower plates 1 and 3.

Then, a protective film 6 for protecting the dielectric is coated on the dielectric film 5 on the upper plate 1, and a partition wall 7 is formed on the dielectric film 5 on the lower plate 3, and then a phosphor ( 8) is applied to the structure.

The operation principle of the plasma display panel having such a structure is as follows.

First, when an operation signal is applied to the address electrode 4 on the lower plate 3, a potential difference is generated through the two sustain electrodes 2 on the upper plate 1. By this potential difference, the gas inside is ionized. Plasma is generated.

At this time, when the ultraviolet rays emitted from the discharged plasma excite the surface of the phosphor 8, visible light is emitted to provide an image.

In the case of the AC type plasma display panel, it has a unique memory function during driving because the charged particles such as electrons and ions formed during gas discharge form wall charges in the dielectric covering the electrode.

In other words, there is no wall charge in the dielectric when there is no discharge, and wall charges are accumulated on the wall of the dielectric when the discharge is formed.

When the wall charges are present, the potentials applied to the external electrodes and the potentials due to the wall charges are added together, so that a discharge is formed at a low voltage.

Therefore, the operation of the plasma display panel can be divided into an addressing operation that causes discharge without the help of wall charges and a sustain operation that causes discharge at low potentials with the help of wall charges.

In general, in the case of an AC plasma display panel currently applied, a plasma discharge is advanced or erased between two sustain electrodes of an upper plate maintained at a sustain voltage by a pulse potential applied due to an address electrode of a lower plate. The change of the wall charges between the two sustain electrodes is shown in FIG. 2.

As shown in FIG. 2, in order to drive the surface type AC plasma display panel, the wall potential formed on the sustain electrode dielectric wall of the upper plate maintained at a constant sustain voltage is applied to the pulse voltage applied by the address electrode on the lower plate. Thereby causing discharge and erasing.

At this time, the dielectric film covering the sustain electrode of the upper plate has a high dielectric constant, so that a high wall charge can be formed, thereby lowering the sustain voltage and the drive voltage during plasma discharge.

However, in the case of the lower address electrode, it is advantageous to use a low dielectric constant dielectric film with low wall charge formation possible because it serves to transfer the image signal to each cell in the plasma panel.

This is because the discharge of each cell in the panel must be quickly emitted and erased, which is advantageous for the image display of the plasma display panel.

However, since the lower dielectric film currently used uses a high dielectric constant of about 10 to 19, there is a disadvantage in that an address voltage is increased and a high price high voltage driving circuit must be selected.

The plasma display panel according to the prior art has the following problems.

Due to the high dielectric constant of the dielectric applying the lower address electrode, the discharge and erasure operations of each cell are slow, which is disadvantageous for the image display of the plasma display panel, and the address voltage is high.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and provides a dielectric of a plasma display panel and a method of manufacturing the same that can replace the lower address electrode dielectric with a material having a low dielectric constant to increase the signal transmission speed and operate at a low voltage. The purpose is.

1 is a cross-sectional view showing the structure of a typical plasma display panel

2 is a waveform diagram showing a wall potential according to an applied voltage when a typical plasma display panel is driven.

3A to 3D illustrate a process of simultaneously forming a dielectric layer and a partition of a plasma display panel according to the present invention.

Explanation of symbols for main parts of the drawings

11: gel 12: lower plate

13: mold

In the dielectric of the plasma display panel according to the present invention, an alkoxide having a chemical formula of M (OR) n (M: a metal element, R: an alkali group, n: an oxidation number of a metal) so that the lower electrode has a low dielectric constant; It is characterized by the formation of a mixture of alcohols.

The method of manufacturing a dielectric of a plasma display panel according to the present invention comprises the steps of mixing an alkoxide having a chemical formula of M (OR) n (M: metal element, R: alkali group, n: number of metal oxides), alcohol and catalyst material, It is characterized by the step of making the mixture into a gel state in a sol state, coating the mixture in a gel state on a lower plate, and drying and heat-treating the coated mixture.

Another characteristic of the method for manufacturing a dielectric of a plasma display panel according to the present invention is to mix an alkoxide having an chemical formula of M (OR) n (M: metal element, R: alkali group, n: number of oxidation of metal), an alcohol, and a catalytic material. Steps of making the mixture into a gel state in a sol state, coating the gel mixture on the lower plate, and stamping and drying the mixture coated on the lower plate into a mold having a shape opposite to the partition wall. And releasing the stamped mold and heat treating the mixture to simultaneously form the partition wall and the first dielectric layer.

A dielectric of a plasma display panel having the above characteristics and a method of manufacturing the same will be described with reference to the accompanying drawings.

In order to manufacture the dielectric film of the present invention applied to the lower address electrode, first, an alkoxide solution having an chemical formula of M (OR) n (M: metal element, R: alkali group, n: oxidation number of metal) and an alcohol solution are mixed. Then, the mixture is hydrolyzed to a sol solution, and then maintained for a predetermined time to give a polymerization reaction to give a liquid gel state.

Here, the general form of the reaction in preparing the sol-gel solution is as follows.

Hydrolysis reaction: M (OR) n + nH ₂ O → M (OH) n + nHOR

Polymerization: xM (OH) n → (MOn / 2) x + xn / 2H ₂ O

At this time, the metal ions are used in the form of a single or complex of silicon, boron, titanium, aluminum, and the like having a low dielectric constant, and water, nitric acid, and the like are used as catalysts for hydrolysis and polymerization.

Dielectric constant by material. material permittivity 96SiO ₂ + 4B ₂ O ₃ 3.85 Soda-lime glass 6.9 PbO glass 10 to 19 SiO ₂ 3.7

In the case of dielectrics currently applied to plasma display panels, glass pastes mainly composed of PbO components are mainly used. In this case, the dielectric constant of this case is as high as about 10 to 19 as shown in Table 1 above.

Therefore, it was suitable as a top dielectric of a plasma display panel, but not as a bottom dielectric.

However, in the present invention, as shown in Table 1, low dielectric constant layers having a dielectric constant of 8 or less can be made by using a sol-gel method using silicon or boron having a low dielectric constant, alone or in a composite form.

That is, the liquid gel prepared as described above is coated on the lower plate of the plasma display panel, dried at 100 ° C. or lower, and then heat-treated at 400 ° C. or lower to form a low dielectric constant dielectric layer on the lower plate.

Here, the liquid gel changes in viscosity in a wide range from several poises to 10 ⁷ poises, and is applied to the lower plate under appropriate conditions in a gel having a range of about 10 ⁴ to 10 ⁷ poises.

In addition, the process may be simplified by simultaneously forming the bottom plate and the partition wall of the plasma display panel using the dielectric prepared as described above.

3A to 3D illustrate a process of simultaneously forming a dielectric layer and a partition of a plasma display panel according to the present invention. As shown in FIG. 3A, M (OR) n (M: a metal element, R: an alkali group, n: an alkoxide solution having an chemical formula of (oxidation number of a metal) and an alcohol solution are mixed, and the mixture is hydrolyzed and polymerized to form a sol solution in a gel state, and then the gel 11 is plasma-displayed with an address electrode. It is applied on the lower plate 12 of the panel.

Then, as shown in FIG. 3B, the gel 11 applied on the lower plate 12 is stamped into a mold 13 having a shape opposite to the partition wall and the gel 11 is dried.

3C, by releasing the stamped mold 13 and heat-treating the gel 11, as shown in FIG. 3D, the partition wall and the dielectric layer are simultaneously formed on the lower plate 12. As shown in FIG.

The dielectric of the plasma display panel and the method of manufacturing the same according to the present invention have the following effects.

By replacing the dielectric for the address electrode of the plasma display panel with a material having a low dielectric constant, an image can be realized at a low driving voltage by increasing the signal transmission speed.

In forming the dielectric layer, by applying the sol-gel method, which is a low temperature process, the deformation of the glass substrate can be prevented and the dielectric layer and the partition wall can be formed simultaneously by applying the stamping method using a mold, thereby simplifying the overall process of the plasma display panel. Let's do it.

Claims (7)

In a plasma display panel comprising a lower plate having a first dielectric and an upper plate having a second dielectric, The first dielectric is formed of a mixture of an alkoxide and an alcohol having a chemical formula of M (OR) n (M: metal element, R: alkali group, n: metal oxide number), and has a low dielectric constant. Dielectric of the panel. The dielectric of claim 1, wherein the metal element M is any one of silicon, boron, titanium, and aluminum having a low dielectric constant. In a plasma display panel comprising a barrier plate and a lower plate having a first dielectric and an upper plate having a second dielectric, Mixing an alkoxide having an chemical formula of M (OR) n (M: metal element, R: alkali group, n: oxidation number of metal), an alcohol, and a catalyst material; Making the mixture from sol to gel; Coating the gelled mixture on the bottom plate; And drying and heat-treating the coated mixture. The method of claim 3, wherein the metal element M is any one of silicon, boron, titanium, and aluminum having a low dielectric constant. 4. The method of claim 3, wherein the catalyst material of the mixture is water or nitrate. The method of claim 3, wherein the drying temperature is 100 ° C. or less, and the heating temperature is 400 ° C. or less. In a plasma display panel comprising a barrier plate and a lower plate having a first dielectric and an upper plate having a second dielectric, Mixing an alkoxide having an chemical formula of M (OR) n (M: metal element, R: alkali group, n: oxidation number of metal), an alcohol, and a catalyst material; Making the mixture from sol to gel; Coating the gelled mixture on the bottom plate; Stamping and drying the mixture coated on the bottom plate into a mold having a shape opposite to the partition wall; And releasing the stamped mold and heat-treating the mixture to simultaneously form the barrier rib and the first dielectric layer.

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