KR100759566B1 - Plasma display panel and the fabrication method thereof - Google Patents

Abstract

A plasma display panel and a method of manufacturing the same are disclosed. The present invention comprises the steps of preparing a raw material for the phosphor layer of the first to nth color for colorization; and coating a substrate for the phosphor material of the first color on the substrate, to complete the first phosphor layer; and Coating an n-1 color phosphor raw material on a substrate to complete an n-1 phosphor layer; and coating an nth color phosphor raw material on a substrate to form an nth phosphor layer. Comprising: Comprising, the surface of the phosphor material having a relatively low luminous efficiency of the first to n-th color is coated with an adsorption preventing material that prevents the adsorption of moisture or impurities, lowering the luminous efficiency of the phosphor layer It is to prevent the, thereby improving the life.

Description

Plasma display panel and manufacturing method thereof

1 is an exploded perspective view illustrating a part of a plasma display panel according to an embodiment of the present invention;

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

3 is a flowchart illustrating a process for manufacturing the phosphor layer of FIG.

4 is a flowchart illustrating a process for manufacturing a blue phosphor layer of the phosphor of FIG.

<Brief description of symbols for the main parts of the drawings>

100 ... plasma display panel

110 ... front substrate 120 ... back substrate

130 ... sustained discharge electrode pair 140 ... X electrode

150 ... Y electrode 180 ... address electrode

210.Bulk wall 220 ... Phosphor layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel manufactured by mixing an adsorption preventing material with a raw material for phosphor in order to improve the luminous efficiency of the phosphor layer, and a manufacturing method thereof.

In general, a plasma display panel injects and discharges a discharge gas between two substrates on which a plurality of discharge electrodes are disposed, and excites the fluorescent material of the phosphor layer by the ultraviolet rays generated thereby to generate desired numbers, letters, or graphics. A flat display device is implemented.

Such a plasma display panel may be classified into a direct current type and an alternating current type according to a type of a driving voltage applied to a discharge cell, for example, a discharge type, and may be classified into a counter discharge type and a surface discharge type according to a configuration of electrodes.

In the DC plasma display panel, all electrodes are exposed to the discharge space, and charge transfer is directly performed between the corresponding electrodes, whereas in the AC plasma display panel, at least one electrode is embedded in the dielectric layer, and the corresponding electrode Instead of direct charge transfer between them, the ions and electrons generated by the discharge adhere to the surface of the dielectric layer to form a wall voltage and maintain the discharge by a sustaining voltage. Say.

On the other hand, in the opposite discharge type plasma display panel, the address electrode and the scan electrode are provided to face each unit pixel, and addressing discharge and sustain discharge are generated between the two electrodes, whereas the surface discharge type plasma display panel has the address for each unit pixel. An electrode, a corresponding X electrode, and a Y electrode are provided to generate addressing discharge and sustain discharge.

For example, in the conventional three-electrode surface discharge type plasma display panel, a plasma display panel is provided with a front substrate and a rear substrate, a pair of sustain discharge electrodes are formed on an inner surface of the front substrate, and a front dielectric layer is formed to fill the same. A protective film layer is formed on a surface of the front dielectric layer, an address electrode is formed on a top surface of the back substrate in a direction crossing the sustain discharge electrode pair, and a back dielectric layer is formed to fill the gap, and between the front substrate and the back substrate. Partitions are arranged to partition discharge cells, and phosphor layers of red, green, and blue are formed in the partitions.

In the conventional plasma display panel having the above structure, when an electrical signal is applied to any one electrode (Y electrode) of an address electrode and a sustain discharge electrode pair, a discharge cell for emitting light is selected, and a plurality of sustain discharge electrode pairs are selected. When an electrical signal is alternately applied, visible light is emitted from the phosphor of the phosphor layer applied in the selected discharge cell, thereby realizing a still image or a moving image.

However, the conventional plasma display panel has a disadvantage that the blue phosphor layer has a lower luminous efficiency than the red and green phosphor layers and thus has a low color temperature.

Accordingly, in the related art, various methods have been devised to increase the luminous efficiency of the blue phosphor layer. That is, work has been made to artificially increase the color temperature in order to adjust the circuits or adjust the light efficiency of the red and green phosphor layers.

In addition, the raw material for blue phosphor is selected as an excellent material in consideration of light efficiency, chromaticity and lifespan, and is being researched and developed. At this time, as a method of improving light efficiency, it produced by changing baking conditions and predetermined | prescribed atmosphere. That is, by adding a predetermined amount of flux, the predetermined temperature was lowered and baking was performed for a short time.

However, although the crystallinity of the surface of the blue phosphor raw material is good due to the flux addition, moisture or impurities are selectively adsorbed on the surface of the raw material due to the structural bonding of the blue phosphor raw material. As a result, the lifetime of the phosphor layer due to panel driving is reduced.

The present invention is to solve the above problems, more specifically, by coating the surface of the element material for phosphors formed in the discharge cell with a relatively low luminous efficiency, the adsorption preventing material is coated, thereby improving the luminous efficiency of the phosphor layer It is an object of the present invention to provide a display panel and a method of manufacturing the same.

In order to achieve the above object, the plasma display panel according to an aspect of the present invention,

A plurality of substrates disposed to face each other; and

A plurality of discharge electrodes disposed in the substrate and to which a predetermined discharge voltage is applied; and

A partition wall disposed between the substrates to partition a discharge cell;

And a phosphor layer applied in the discharge cell and formed in a plurality of colors for colorization.

The surface of the phosphor element material applied to the discharge cell of the phosphor layer having a relatively low luminous efficiency is characterized in that the adsorption prevention material is coated.

In addition, the phosphor layer includes red, green, and blue phosphor layers,

It is characterized in that the adsorption prevention material is coated on the surface of the element material for phosphors formed in the discharge cell emitting blue light.

Further, the adsorption preventing material is characterized in that the alumina.

In addition, the raw material for the blue phosphor is BaMgAl ₁₀ O ₁₇ : Eu ²⁺ or CaMgSi ₂ O ₈ : Eu ²⁺ or BaMgAl ₁₀ O ₁₇ : Eu ²⁺ and CaMgSi ₂ O ₈ : Eu ²⁺ . It is characterized by consisting of any one selected.

Method of manufacturing a plasma display panel according to another aspect of the present invention,

Preparing a raw material for the phosphor layer of the first to nth colors for colorization; and

Coating a raw material for phosphor of a first color on a substrate to complete a first phosphor layer; and

Coating an n-1 color phosphor raw material on a substrate to complete an n-1 phosphor layer; and

And coating the raw material for phosphor of the nth color on a substrate to complete an nth phosphor layer.

The surface of the phosphor material having a relatively low luminous efficiency among the first to nth colors may be coated with an adsorption preventing material that prevents adsorption of moisture or impurities.

In the step of preparing the raw material for the phosphor,

It is characterized by including a red phosphor raw material, a green phosphor raw material, and a blue phosphor raw material.

Moreover, the raw material for the blue phosphor,

Preparing a raw material for a blue phosphor;

Mixing an adsorption preventing material with the blue phosphor raw material;

Drying the blue phosphor material mixed with the adsorption preventing material;

Calcining the raw material for blue phosphor mixed with the adsorption preventing material; And

And completing the raw material for blue phosphor mixed with the adsorption preventing material.

In addition, in the step of preparing the raw material for the blue phosphor,

BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , CaMgSi ₂ O ₈ : Eu ²⁺ , BaMgAl ₁₀ O ₁₇ : Eu ^2+, and a mixture of CaMgSi ₂ O ₈ : Eu ²⁺ are prepared as the raw material. Characterized in that.

Furthermore, in the step of mixing the adsorption preventing material to the blue phosphor layer raw material,

Aluminum tetraalkoxide, ethanol, and acetyl acetate are mixed as the adsorption preventing material.

Further, in the step of drying the raw material for blue phosphor mixed with the adsorption preventing material,

It is characterized by evaporating ethanol and acetyl acetate by drying in a temperature range of about 100 to 140 ℃.

In addition, in the step of firing the raw material for blue phosphor mixed with the adsorption preventing material,

It is characterized in that the alumina is coated on the surface of the raw material for a blue phosphor by firing in a temperature range of about 400 to 600 ℃.

Hereinafter, an example of a plasma display panel according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a partial cutaway view of a plasma display panel 100 according to an embodiment of the present invention, and FIG. 2 is a cutaway view taken along line I-I in a state in which the panel 100 of FIG. 1 is coupled. will be.

1 and 2, the plasma display panel 100 includes a front substrate 110 and a rear substrate 120 disposed in parallel with the front substrate 110. The front substrate 110 and the rear substrate 120 are coated with frit glass along edges of surfaces facing each other, thereby sealing an internal discharge space from the outside.

The front substrate 110 is made of a transparent substrate, for example, soda lime glass. Alternatively, the front substrate 110 may use a translucent plate, a colored substrate, a reflector, or the like.

The X electrode 140 and the Y electrode 150, which are the sustain discharge electrode pairs 130, are disposed along the X direction of the panel 100 on the inner surface of the front substrate 110. The X electrode 140 and the Y electrode 150 are alternately arranged along the Y direction of the panel 100. The X electrode 140 and the Y electrode 150 are disposed one for each discharge cell.

The X electrode 140 is a first transparent electrode 141 formed on the inner surface of the front substrate 110 and the first transparent electrode continuously disposed for each discharge cell formed adjacent to the X direction of the panel 100 And a first bus electrode 142 that electrically connects 141. In the present embodiment, the first transparent electrode 141 has a rectangular cross section, but is not necessarily limited thereto.

The Y electrode 150 is substantially the same shape as the X electrode 140, and is adjacent to the second transparent electrode 151 formed on the inner surface of the front substrate 110 along the X direction of the panel 100. The second bus electrode 152 electrically connects the second transparent electrode 151 continuously disposed for each discharge cell. The second transparent electrode 151 is disposed for each discharge cell and is rectangular in shape, but is not necessarily limited thereto. The second transparent electrode 151 is disposed to be spaced apart from the first transparent electrode 141 by a predetermined interval for each discharge cell, thereby forming a discharge gap therebetween.

The first transparent electrode 141 and the second transparent electrode 151 are made of a transparent conductive film, for example, an indium tin oxide film, to improve the opening ratio of the front substrate 110. The first bus electrode 142 and the second bus electrode 152 may be a metal material having excellent conductivity, such as silver paste, in order to improve electrical conductivity of the first transparent electrode 141 and the second transparent electrode 151. (Ag paste) or multilayer of chromium-copper-chromium alloy.

In addition, the space between the pair of X and Y electrodes 140 and 150 and the other pair of X and Y electrodes 140 and 150 adjacent thereto correspond to a non-discharge area. In the non-discharge region, a black stripe layer may be further formed to improve contrast.

The X electrode 140 and the Y electrode 150 are buried by the front dielectric layer 160. The front dielectric layer 160 is made of a highly dielectric material, for example, ZnO—B ₂ O ₃ —Bi ₂ O ₃ . The front dielectric layer 160 may be selectively printed only on a portion where the sustain discharge electrode pair 130 is formed, or may be front printed over the entire surface of the front substrate 110.

A protective layer 170, such as magnesium oxide (MgO), is deposited on the surface of the front dielectric layer 110 to prevent breakage thereof and to increase secondary electron emission.

The back substrate 120 may also be made of substantially the same material as the front substrate 110.

An address electrode 180 is disposed on an inner surface of the rear substrate 120. The address electrode 180 is disposed in a direction crossing the sustain discharge electrode pair 130. The address electrode 180 is buried by the back dielectric layer 190. The back dielectric layer 190 is made of a highly dielectric material, such as PbO-B ₂ O ₃ -SiO ₂ .

A partition wall 210 is formed between the front substrate 110 and the rear substrate 120 to partition a discharge cell together with the front substrate 110 and the rear substrate 120. The partition wall 210 includes a first partition wall 211 disposed in the X direction of the panel 100 and a second partition wall 212 disposed in the Y direction of the panel 100. The first partition 211 extends integrally from the inner side walls of the pair of adjacent second partitions 212 in opposite directions to partition the grid-shaped discharge cells.

Alternatively, the partition 210 may have various types of embodiments such as a meander type, a delta type, a waffle type, a honeycomb type, and the like. The discharge space defined by the partition wall 210 may have various embodiments such as a polygon, a circle, an ellipse, a triangle, a pentagon, and the like, in addition to a quadrangle, as in the present embodiment.

Meanwhile, in the discharge cell defined by the front substrate 110, the rear substrate 120, and the partition wall 210, neon (Ne) -xenon (Xe) or helium (He) -xenon (Xe) Discharge gas is injected.

In the discharge cell, there is formed a phosphor layer 220 of a plurality of colors for colorization which is excited by ultraviolet rays generated from the discharge gas and emits visible light. In addition, the phosphor layer 220 may be coated on any area of the discharge cell. In the present embodiment, the phosphor layer 220 is coated on the inner surface of the rear substrate 120 and the inner wall of the partition 210 to a predetermined thickness.

Here, an adsorption prevention material is coated on the surface of the phosphor raw material formed in the discharge cell of the phosphor layer 220 having a relatively low luminous efficiency to prevent adsorption of impurities or moisture.

In more detail, it is as following.

A partition wall 210 defining a discharge cell is partitioned between the front substrate 110 and the rear substrate 120. The barrier rib 210 is formed of a dielectric material capable of inducing charge during discharge. Preferably, the partition wall 210 is formed by adding an organic vehicle and various fillers to glass powder.

The phosphor layer 220 is formed in the discharge cell partitioned by the partition wall 210. In the present embodiment, the phosphor layer 220 is composed of a red phosphor layer 220R, a green phosphor layer 220G, and a blue phosphor layer 220B, but is not necessarily limited thereto, and may be replaced with a phosphor layer having a different color. It may be further formed with a phosphor layer of a different color.

The red phosphor layer 220R of the present embodiment is made of (Y, Gd) BO ₃ ; Eu ⁺³ , the green phosphor layer 220G is made of Zn ₂ SiO ₄ : Mn ²⁺ , and the blue phosphor layer 220B ) Preferably consists of BaMgAl ₁₀ O ₁₇ : Eu ²⁺ . Alternatively, the blue phosphor layer 220B may use CaMgSi ₂ O ₈ : Eu ²⁺ . CaMgSi ₂ O ₈ : Eu ²⁺ is an organic combination of Ca, MgO ₆ and SiO ₄ .

In this case, the plasma display panel 100 is disposed in the blue discharge cell B as compared to the red phosphor layer 220R formed in the red discharge cell R and the green phosphor layer 220G formed in the green discharge cell G. The luminous efficiency of the formed blue phosphor layer 220B is relatively low.

That is, BaMgAl ₁₀ O ₁₇ : Eu ^{2+, which} is a raw material of a blue phosphor, has a crystal structure of a layered structure, and is caused by a lack of oxygen (O ₂ ) near a layer containing a Ba atom (Ba-O layer). Therefore, regardless of particle size or particle shape, water or impurities are selectively adsorbed on the surface of the Ba—O layer. In order to prevent this phenomenon, the surface of the raw material of the blue phosphor is coated with alumina (Al ₂ O ₃ ). Since the alumina surrounds the surface of the raw material, it prevents adsorption of moisture or impurities.

A method for manufacturing the phosphor layer having the above configuration will be described with reference to FIGS. 2 to 4.

First, referring to FIGS. 2 and 3, the raw material for the red phosphor layer 220R is formed on the plasma display panel 100. (S10) In this case, the raw material for the red phosphor is (Y, Gd). Prepare BO ₃ ; Eu ⁺³ .

Next, the red phosphor raw material is coated on the back substrate 120 (S20). At this time, the address electrode 180 and the back dielectric layer 190 filling the back substrate 120 are previously formed on the back substrate 120. It is. After the coating, the red phosphor raw material is dried to complete the red phosphor layer 220R. (S30)

Next, an element material for green phosphor is formed. (S40) At this time, Zn ₂ SiO ₄ : Mn ²⁺ is prepared as an element material for green phosphor. Subsequently, the green phosphor raw material is coated on the rear substrate 120 (S50), and dried to complete the green phosphor layer 220G. (S60)

Next, an element material for blue phosphor is formed. (S70) At this time, BaMgAl ₁₀ O ₁₇ : Eu ²⁺ is prepared as an element material for blue phosphor. Alternatively, CaMgSi ₂ O ₈ : Eu ²⁺ may be used as the raw material for the blue phosphor, or any one selected from a mixture of BaMgAl ₁₀ O ₁₇ : Eu ²⁺ and CaMgSi ₂ O ₈ : Eu ²⁺ may be prepared. Could be In addition, the adsorption prevention material which will be described in FIG. 4 is coated on the surface of the blue phosphor raw material. Subsequently, the blue phosphor raw material is coated on the back substrate 120 (S80), and dried to complete the blue phosphor layer 220B. (S90)

After the red phosphor layer 220R, the green phosphor layer 220R, and the blue phosphor layer 220B are sequentially completed through the same process, the pattern is inspected to determine whether it is formed at the correct position in the partition wall 210. (S100)

Among these, the process of forming the blue phosphor layer 220B will be described with reference to FIGS. 2 and 4.

First, the raw material for the blue phosphor is prepared. (T10) At this time, the raw material for the blue phosphor is BaMgAl ₁₀ O ₁₇ : Eu ²⁺ or CaMgSi ₂ O ₈ : Eu ²⁺ or BaMgAl ₁₀ O as described above. ₁₇ : Eu ²⁺ and CaMgSi ₂ O ₈ : Eu ²⁺ .

Next, an adsorption preventing material is mixed with the blue phosphor raw material (T20).

As the adsorption prevention material, aluminum tetra alkoxide (Al (OR ₄ )), such as aluminum tetra secondary butoxide, ethanol, acetyl acetate (Acetylacetate), etc. Will be mixed.

After the mixing is completed, the raw material for blue phosphor mixed with the adsorption preventing material is dried. (T30) At this time, the drying conditions are dried at a temperature range of about 100 to 140 ° C. to evaporate ethanol and acetyl acetate. .

Subsequently, the raw material for blue phosphor mixed with the adsorption preventing material is fired (T40). That is, in the firing step, the organic component is volatilized by firing within a temperature range of about 400 to 600 ° C.

As a result, alumina is coated on the surface of the blue phosphor raw material to complete the light blue phosphor raw material. (T50)

Referring to the operation of the plasma display panel 100 having the above structure is as follows.

First, when a predetermined pulse voltage is applied between the address electrode 180 and the Y electrode 150 from an external power source, the discharge cell to emit light is selected. Wall charges are accumulated on the inner surface of the selected discharge cell.

Subsequently, when a voltage of “+” is applied to the X electrode 140 and a voltage higher than this is applied to the Y electrode 150, a wall is formed by the voltage difference applied between the X and Y electrodes 140 and 150. The charge will move.

The movement of the wall charges causes a discharge by colliding with the discharge gas atoms in the discharge cell, and the discharge starts from a gap of the X and Y electrodes 140 and 150 in which a relatively strong electric field is formed. To the outside.

In this way, after the discharge is formed, if the voltage difference between the X and Y electrodes 140 and 150 becomes lower than the discharge voltage, the discharge no longer occurs, and the space charge and the wall charge are formed in the discharge cell.

At this time, when the polarities of the voltages applied to the X and Y electrodes 140 and 150 are changed to each other, the discharge is generated again with the help of the wall charge. If the polarities of the X and Y electrodes 140 and 150 are immediately changed, the first discharging process is repeated. The discharge is stably generated while repeating this process.

On the other hand, the ultraviolet rays generated by the discharge excite the fluorescent materials of the red, green, and blue phosphor layers 220R, 220G, and 220B applied to the respective discharge cells. Through this process, visible light is obtained. The generated visible light is emitted to the discharge cells to implement a still image or a moving picture.

At this time, the surface of the raw material of the blue phosphor layer 220B is coated with alumina, thereby preventing moisture or impurities from adsorbing to BaMgAl ₁₀ O ₁₇ : Eu ²⁺ during long periods of time, thereby preventing panel efficiency from being lowered. There is a number.

As described above, in the plasma display panel of the present invention, by adsorbing an anti-adsorption material on the surface of the phosphor material having a relatively low luminous efficiency, the luminous efficiency of the phosphor layer is prevented from being lowered, thereby improving the lifetime.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (12)

delete delete delete delete Preparing a raw material for a phosphor layer comprising a red phosphor raw material material for colorization, a green phosphor raw material material, and a blue phosphor raw material material; and Coating a red phosphor raw material on a substrate to complete a red phosphor layer; and Coating a green phosphor raw material on a substrate to complete a green phosphor layer; and And coating a blue phosphor raw material on a substrate to complete a blue phosphor layer. In the step of preparing the raw material for the blue phosphor, Mixing an adsorption preventing material for preventing adsorption of moisture or impurities to the raw material for blue phosphor; and Drying the raw material for blue phosphor mixed with the adsorption preventing material; and Firing and completing the raw material for the blue phosphor mixed with the adsorption preventing material; manufacturing method of a plasma display panel comprising a. delete delete The method of claim 5, In the step of preparing the raw material for the blue phosphor, BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , CaMgSi ₂ O ₈ : Eu ²⁺ , BaMgAl ₁₀ O ₁₇ : Eu ^2+, and a mixture of CaMgSi ₂ O ₈ : Eu ²⁺ are prepared as the raw material. Method of manufacturing a plasma display panel, characterized in that. The method of claim 5, In the step of mixing the adsorption preventing material to the blue phosphor layer raw material, An aluminum tetraalkoxide, ethanol and acetyl acetate are mixed as the adsorption preventing material. The method of claim 5, In the step of drying the raw material for blue phosphor mixed with the adsorption preventing material, Drying in a temperature range of about 100 to 140 ℃, ethanol and acetyl acetate to evaporate a method for producing a plasma display panel. The method of claim 5, In the step of firing the raw material for blue phosphor mixed with the adsorption preventing material, A method of manufacturing a plasma display panel, which comprises baking alumina on the surface of a raw material for a blue phosphor by firing at a temperature in the range of 400 to 600 ° C. A plasma display panel manufactured by the manufacturing method of any one of claims 5, 8, 9, 10 or 11.

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