KR20050105292A - Plasma display panel - Google Patents

Abstract

A plasma display panel is disclosed. The present invention includes a front substrate; a rear substrate disposed to face the substrate; a dielectric wall disposed between both substrates to define a discharge space; and X and Y electrodes separately disposed along a circumference of the discharge space. A sustain electrode; an address electrode disposed on the rear substrate; and a red, green, and blue phosphor layer coated in the discharge space; and at least one substrate facing the discharge space includes a groove having a predetermined size. Since it is formed, the discharge space can be enlarged. Accordingly, the efficiency of the panel can be improved by increasing the luminance.

Description

Plasma display panel {Plasma display panel}

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 having an improved structure to expand discharge space to improve discharge efficiency.

In general, a plasma display panel injects and discharges a sealed discharge gas between two substrates on which discharge electrodes are formed, and excites the fluorescent material of the phosphor layer by the ultraviolet rays generated by the plasma display panel to realize a desired number, letter, or graphic. It is a flat display device.

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

The DC plasma display panel has a structure in which all electrodes are exposed to a discharge space, and charges are directly transferred between corresponding electrodes. On the other hand, in the AC plasma display panel, at least one electrode is embedded in the dielectric layer, and instead of direct charge transfer between the corresponding electrodes, ions and electrons generated by the discharge adhere to the surface of the dielectric layer so that the wall voltage is reduced. (wall voltage) is formed, and the discharge can be maintained by the sustaining voltage.

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

1 illustrates a unit discharge cell of a conventional plasma display panel 100.

Referring to the drawings, the plasma display panel 100 includes a front substrate 110, a rear substrate 120 disposed to face the front substrate 110, and an X electrode 131 and a Y electrode formed on an inner surface of the front substrate 110. 132, a sustain electrode 130 having a bus electrode 133 electrically connected to the X and Y electrodes 131, 132, a front dielectric layer 140 burying the sustain electrode 130; A passivation layer 150 coated on a surface of the front dielectric layer 140, an address electrode 160 formed on an inner surface of the rear substrate 120 and disposed in a direction crossing the sustain electrode 130; A back dielectric layer 170 filling the address electrode 160, a partition wall 180 disposed between the front and back substrates 110 and 120, and a red color applied to the inside of the partition wall 180, Green and blue phosphor layer 190 is included.

The operation of the plasma display panel 100 having the above structure will be briefly described as follows.

By applying an address voltage between the Y electrode 132 and the address electrode 160 and applying a sustain discharge voltage between the pair of X and Y electrodes 131 and 132, the front dielectric layer 140 and the passivation layer 150 ) Surface discharge occurs in the discharge region on the surface, and ultraviolet rays are generated. An image is realized as the fluorescent material of the surrounding phosphor layer 190 is excited by the generated ultraviolet rays.

However, the conventional plasma display panel 100 includes a sustain electrode 130 which is an electrode for generating a discharge along an inner surface of the front substrate 110 through which visible light emitted from the phosphor layer 190 passes, and a front dielectric layer ( 140), since the protective film layer 150 is formed, the transmittance of visible light is only about 60%.

In particular, the conventional plasma display panel 100 has a structure in which a discharge electrode 130 is formed on the inner surface of the front substrate 110 through which visible light passes, ie, an electrode 130 causing a discharge, and a discharge is generated and diffused. Therefore, luminous efficiency is low.

Moreover, since the discharge space is narrow, improvement of the brightness of the panel 100 cannot be expected above a certain limit, and thus the efficiency of the panel 100 is lowered.

The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel in which a discharge space is enlarged by forming a predetermined groove on a substrate.

Another object of the present invention is to provide a plasma display panel in which discharge electrodes are provided along the circumference of the discharge space to improve the transmittance of the substrate.

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

A front substrate;

A rear substrate disposed to face the front substrate;

A dielectric wall disposed between the front substrate and the rear substrate and partitioning a discharge space together with the front and rear substrates;

A sustain electrode disposed separately along the circumference of the discharge space and having a plurality of X and Y electrodes embedded in the dielectric wall;

An address electrode disposed on the rear substrate and embedded by a dielectric layer;

It includes; red, green, blue phosphor layer applied in the discharge space;

At least one substrate facing the discharge space is characterized in that the groove portion of a predetermined size is formed.

In addition, the groove portion is characterized in that formed on the inner surface of the front substrate in contact with the discharge space.

In addition, the groove portion is characterized in that formed in a size corresponding to the discharge space partitioned by the dielectric wall.

Moreover, the depth of the groove is characterized in that less than 100 micrometers.

Further, a partition wall is further formed between the dielectric wall and the rear substrate to define a discharge space together with the dielectric wall, and a phosphor layer is coated inside the partition wall.

In addition, the sustain electrode extends in one direction, and the address electrode extends to intersect the sustain electrode in a discharge space.

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

2 illustrates a state where a discharge electrode according to an embodiment of the present invention is disposed.

Referring to the drawings, a partition wall 220 made of a dielectric for partitioning a discharge space is disposed on the substrate 210. The partition wall 220 includes a horizontal partition wall 221 disposed in the X direction and a vertical partition wall 222 disposed in the Y direction, and the horizontal and vertical partition walls 221 and 222 are coupled to each other to form a grid. It is coming true.

The first discharge electrode 230 is disposed at a portion corresponding to the partition wall 220. The first discharge electrode 230 is formed in a quadrangular shape along the circumference of the discharge space, and forms a ladder shape in which a quadrangular shape adjacent to the X direction is continuously connected. Accordingly, the same voltages are applied to the first discharge electrodes 230 arranged in the X direction. On the other hand, in the first discharge electrode 230 disposed in the Y direction, the ladder-shaped electrodes are separated from each other by a predetermined interval. Therefore, different voltages are applied to the first discharge electrodes 230 arranged in the Y direction.

In addition, the second discharge electrode 240 is disposed in a direction intersecting the first discharge electrode 230 in the discharge space. The second discharge electrode 240 is strip-shaped in this embodiment if any shape is possible as long as it is disposed in the direction crossing the first discharge electrode 230. The second discharge electrodes 240 are disposed to be spaced apart at predetermined intervals in the X direction, and different voltages may be applied between adjacent electrodes.

The first and second discharge electrodes 230 and 240 may be configured as two electrodes or three electrodes depending on whether the panel is a counter discharge type or a discharge type. In addition, various embodiments may exist, such that each discharge electrode may be configured in plural or at least one electrode may be arranged in plural.

Hereinafter, in an embodiment to be described below, the first discharge electrode is composed of a sustain electrode having X and Y electrodes arranged up and down, and the second discharge electrode is described by taking a three-electrode surface discharge plasma display panel composed of address electrodes as an example. However, the technical idea of the present invention is not limited thereto.

3 is a cross-sectional view illustrating a plasma display panel 300 according to an exemplary embodiment of the present invention, and FIG. 4 is an exploded perspective view of a portion of the panel of FIG. 3 cut out.

3 and 4, the plasma display panel 300 includes a front substrate 310 and a rear substrate 320 disposed in parallel with the front substrate 310. The front and back substrates 310 and 320 are sealed to each other by frit glass.

The front substrate 310 is made of a transparent substrate such as soda lime glass. The back substrate 320 is also made of the same material as the front substrate 310.

An address electrode 330 is disposed on an inner surface of the rear substrate 320. The address electrode 330 has a strip shape disposed across the discharge space. The address electrode 330 is disposed for each unit discharge cell, and is formed using a metal material having excellent conductivity, for example, silver paste.

The address electrode 330 is buried by the dielectric layer 340. The dielectric layer 340 completely fills the address electrode 330 using a transparent dielectric material, such as PbO-B ₂ O ₃ -SiO ₂ . Alternatively, only the portion where the address electrode 330 is patterned may be embedded.

A partition wall 350 made of a low dielectric material is formed on an upper surface of the dielectric layer 340. The partition wall 350 is formed by adding various fillers to glass paste. The partition wall 350 includes a horizontal partition wall 351 disposed in a direction orthogonal to the address electrode 330, and a vertical partition wall 352 disposed in a direction parallel to the address electrode 330. The vertical partition wall 352 integrally extends in the opposite direction from the inner side walls of the pair of adjacent horizontal partition walls 351, thereby partitioning the discharge space into squares.

Alternatively, the barrier 350 may have various types of embodiments, such as a stripe type, a meander type, or a delta type. In addition, as in the present embodiment, the discharge space may have other shapes such as a triangle, a hexagon, and an ellipse as long as the structure can partition the discharge space in addition to the quadrangle.

The storage electrode 360 is disposed between the front substrate 310 and the partition wall 350. The sustain electrode 360 includes an X electrode 361 disposed relatively adjacent to the front substrate 310, and a Y electrode 362 disposed relatively adjacent to the rear substrate 320. The Y electrode 362 is disposed below the X electrode 361. Since the X and Y electrodes 361 and 362 are arranged up and down in an electrically insulated state, different voltages may be applied.

The sustain electrode 360 is disposed along the circumference of the discharge space. In addition, the sustain electrode 360 is positioned at an upper end side of the partition wall 350 so as not to be located at inner surfaces of the front and rear substrates 310 and 320 facing the discharge space. Accordingly, the sustain electrode 360 forms a closed loop for each discharge space.

On the other hand, the X and Y electrodes 361 and 362 are made of a metal material having excellent conductivity having substantially the same shape, such as silver paste or chromium-copper-chromium (Cr-Cu-Cr). In addition, the X and Y electrodes 361 and 362 are integrally connected to each other between the electrodes disposed in the discharge space adjacent in one direction to form a ladder shape. Alternatively, the X and Y electrodes 361 and 362 located in adjacent discharge spaces in the direction crossing the address electrode 330 may be integrally connected to each electrode by conductive connecting members.

The sustain electrode 360 is buried by the dielectric wall 380. The dielectric wall 380 is positioned between the front substrate 310 and the partition wall 350, and the X and Y electrodes 361 and 362 are disposed to be positioned up and down in the interior thereof. The dielectric wall 370 is made of a material such as high dielectric material such as PbO-B ₂ O ₃ -SiO ₂ .

The dielectric wall 370 partitions a discharge space together with the front substrate 310, the rear substrate 320, and the partition wall 350. To this end, the dielectric wall 370 is substantially the same shape as the partition wall 350 and is positioned on the partition wall 350 with a thickness and a height sufficient to fill the X and Y electrodes 361 and 362. .

Alternatively, the partition wall 350 may be extended to a portion where the partition wall 350 is formed without separately forming the partition wall 350 between the partition wall and the back substrate 350 and 320. It may be possible to perform both functions.

When only the dielectric wall 370 is formed between the front and rear substrates 310 and 320, a single wall forms a structure defining a discharge space, and the partition wall 350 and the dielectric wall 370 are both front and back. When formed between the back substrates 310 and 320, a double wall made of a material having different dielectric constants divides the discharge space.

A protective film layer 380 made of a material such as magnesium oxide (MgO) is formed on the inner surface of the dielectric wall 370 to prevent dielectric breakdown and increase secondary electron emission. The passivation layer 380 is applied to the entire inner surface of the dielectric wall 370.

In the discharge space partitioned by the partition wall 350 and the dielectric wall 380, a mixed gas such as neon (Ne) -xenon (Xe) is injected and excited by ultraviolet rays generated from the discharge gas to emit visible light. The red, green, and blue phosphor layers 390 are coated for each discharge cell.

The phosphor layer 390 may be coated on any surface of the discharge space, but is preferably coated on the inner side of the partition wall 350 at a lower portion where the sustain electrode 360 is formed. In the present embodiment, the phosphor layer 390 is coated to a height corresponding to the partition wall 350.

In addition, the phosphor layer 390 is made of a respective phosphor material. For example, the red phosphor layer is composed of (Y, Gd) BO ₃ ; Eu ⁺³ , the green phosphor layer is composed of Zn ₂ SiO ₄ : Mn ²⁺ , and the blue phosphor layer is BaMgAl ₁₀ O ₁₇ : Eu It is preferably formed of ²⁺ .

In this case, a discharge enlargement part is formed in the panel 300 to enlarge the discharge space.

That is, the groove 311 is formed along the inner surface of the front substrate 310 facing the discharge space. The groove 311 is formed to have a size corresponding to the discharge space divided into quadrangles by the partition wall 350 and the dielectric wall 370. The groove 311 is formed for each discharge cell. The groove 311 may be formed by a sand blasting method or an etching method.

In addition, the depth d of the groove 311 is preferably 100 micrometers or less. When the depth d of the groove 311 is 100 micrometers or more, the increase in luminance is no longer achieved, but rather, the local thickness of the front substrate 310 is made thinner, thereby causing a risk of damage.

Efficiency improvement data according to whether the groove is formed according to the applicant's experiment is as shown in Table 1 and FIG. 5.

TABLE 1

Etching degree P / W F / W efficiency Comparative Example 1 0 954 184 0% Example 1 10 988 190 3% Example 2 20 1019 195 6% Example 3 30 1044 201 9% Example 4 40 1095 210 14% Example 5 50 1131 217 18% Example 6 60 1159 223 21% Example 7 70 1199 230 25% Example 8 80 1228 236 28% Example 9 90 1248 239 30% Example 10 100 1257 241 31% Comparative Example 2 110 1265 241 31% Comparative Example 3 120 1271 241 31%

 Here, Comparative Example 1 shows a case where the groove part is not formed in the panel, and Examples 1 to 10 show the case where the depth of the groove part is formed in the panel by increasing the interval of 10 micrometers, and Comparative Example 2 and 3 shows a case where the depth of the groove portion is 100 or more and formed in the panel.

In addition, P / W is an abbreviation of peak white, and is the luminance in the brightest part on the panel, and F / W is an abbreviation of full white, and refers to the luminance in the entire area of the panel. Efficiency shows the improvement of F / W.

Referring to Table 1 and FIG. 5, P / W was 954 cd / m ² and F / W was 184 cd / m ² in Comparative Example 1, in which no groove was formed on the panel.

And, in Examples 1 to 10, in which the depth of the groove portion is formed in the panel by 10 micrometer increments of 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100 micrometers, the P / W is 988, 1019, 1044, 1095, 1131, 1159, 1199, 1228, 1249, 1257 cd / m ² and F / W is 190, 195, 201, 210, 217, 223, 230, 236, 239, respectively. , 241 cd / m ² . The efficiency accordingly was 3, 6, 9, 14, 18, 21, 25, 28, 30, 31%, respectively.

On the other hand, in Comparative Examples 2 and 3, in which the depth of the groove is formed to be 100 or more, P / W is 1265 and 1271 cd / m ² , and F / W is 241 and 241 cd / m ² , respectively. , 31%.

As such, in the case of the embodiment of the present invention in which the groove is formed in the panel at 100 micrometers or less than when the groove is not formed in the panel, the P / W, the F / W, and the efficiency thereof are all improved. And, when the groove portion is formed in the panel of 100 micrometers or more, it can be seen that no more P / W, F / W, and efficiency are further improved.

The operation of the plasma display panel 300 having the above structure will be described below.

First, when a predetermined address voltage is applied between the address electrode 330 and the Y electrode 362 from an external power source, the discharge cell to emit light is selected. Wall charges are accumulated on the Y electrode 362 of the selected discharge cell.

Subsequently, when a voltage of “+” is applied to the X electrode 361 and a voltage higher than this is applied to the Y electrode 362, the wall is caused by the voltage difference applied between the X and Y electrodes 361 and 362. The charge will move.

The movement of the wall charges generates a plasma by colliding with the discharge gas atoms in the discharge space, and these discharges are generated from adjacent portions of the X electrode 361 and the Y electrode 362 where a relatively strong electric field is formed. The probability is high.

As a result, since the X electrode 361 and the Y electrode 362 are formed along the side surfaces of the discharge space, the possibility of the discharge occurring is greatly increased.

Subsequently, if the voltage difference between the X electrode 361 and the Y electrode 362 is still sufficiently large over time, the electric field formed between the two electrodes 361 and 362 is gradually concentrated so that the discharge is discharged. It spreads throughout the space.

Since the discharge in this embodiment is generated in a ring type at four sides of the discharge space and diffuses to the center of the discharge space, the diffusion range is greatly increased. In addition, since the plasma generated by the discharge is formed in a ring type along the side of the discharge space and then diffuses into the center portion, the volume thereof is greatly increased so that the amount of visible light is greatly increased, and the plasma is concentrated in the center portion of the discharge space. Space charge can be utilized to enable low voltage driving, and light emission efficiency can be improved.

In addition, since the plasma is concentrated at the center of the discharge space, and the electric fields by the X and Y electrodes 361 and 362 are formed at both sides of the plasma, the charge is concentrated at the center of the discharge space to the phosphor layer 390. Ion sputtering can be prevented at the source.

If the voltage difference between the X and Y electrodes 361 and 362 is lower than the discharge voltage after the discharge is formed in this manner, the discharge no longer occurs, and the space charge and the wall charge are formed in the discharge space. At this time, if the polarities of the voltages applied to the X and Y electrodes 361 and 362 are reversed, the discharge is generated again with the help of the wall charge. If the polarities of the X and Y electrodes 361 and 362 are changed immediately, the first discharge process is repeated. The discharge is stably generated while repeating this process.

At this time, the ultraviolet rays generated by the discharge excite the fluorescent material of the phosphor layer 390 applied to each discharge space. Through this process, visible light is obtained. The generated visible light is radiated into the discharge space to realize an image.

In the plasma display panel 300, since the groove 311 having a predetermined size is formed on the inner surface of the front substrate 3110, the discharge region may be enlarged.

As described above, the plasma display panel of the present invention can enlarge the discharge space by forming a predetermined groove in the inner surface of the substrate in contact with the discharge space. Accordingly, the efficiency of the panel can be improved by increasing the luminance. In addition, as the discharge is implemented along the side of the discharge space, the discharge surface is greatly enlarged.

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.

1 is a cross-sectional view showing a unit discharge cell of a conventional plasma display panel;

2 is a plan view schematically showing a state where a discharge electrode of a plasma display panel according to an embodiment of the present invention is disposed;

3 is a cross-sectional view showing a plasma display panel according to an embodiment of the present invention;

4 is an exploded perspective view of the panel of FIG. 3;

5 is a graph showing the efficiency improvement rate according to the expansion of the discharge space according to an embodiment of the present invention.

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

300 ... plasma display panel 310 ... front substrate

311.groove 320 ... back board

330 ... Address electrode 340 ... Dielectric layer

350 bulkhead 360 holding electrode

361 ... X electrode 362 ... Y electrode

370 Dielectric Wall 380 Protective Layer

390 ... phosphor layer

Claims (7)

A front substrate; A rear substrate disposed to face the front substrate; A dielectric wall disposed between the front substrate and the rear substrate and partitioning a discharge space together with the front and rear substrates; A sustain electrode disposed separately along the circumference of the discharge space and having a plurality of X and Y electrodes embedded in the dielectric wall; An address electrode disposed on the rear substrate and embedded by a dielectric layer; It includes; red, green, blue phosphor layer applied in the discharge space; At least one substrate facing the discharge space, wherein a groove portion having a predetermined size is formed. The method of claim 1, And the groove portion is formed on an inner surface of the front substrate in contact with the discharge space. The method of claim 2, And the groove portion is formed to have a size corresponding to a discharge space partitioned by a dielectric wall. The method of claim 1, And the depth of the groove portion is 100 micrometers or less. The method of claim 1, And a partition wall is further formed between the dielectric wall and the back substrate to define a discharge space together with the dielectric wall, and a phosphor layer is coated inside the partition wall. The method of claim 1, The sustain electrode extends in one direction, and the address electrode extends to intersect the sustain electrode in a discharge space. The method of claim 1, And a passivation layer is further formed on the inner surface of the dielectric wall to increase secondary electron emission.