KR20050114089A - Plasma display panel - Google Patents

Abstract

A plasma display panel is disclosed. The present invention includes a front substrate; a rear substrate disposed opposite thereto; a dielectric wall defining a discharge space together with the front and rear substrates; and X disposed separately along the circumference of the discharge space and embedded in the dielectric wall. An electrode, a sustain electrode having a Y electrode, and an address electrode disposed on the rear substrate and embedded by a dielectric layer; and a red, green, and blue phosphor applied in a discharge space; Since the Y electrode forms a plurality of discharge portions at different intervals of at least one portion, the discharge spreads slowly, so that uniform discharge is possible and discharge can be induced while lowering the discharge start potential.

Description

Plasma display panel {Plasma display panel}

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which a discharge electrode is disposed along a circumference of a discharge space, and a plurality of initial discharge points are formed on the discharge electrode to facilitate diffusion of discharge. .

In general, a plasma display panel injects and discharges a discharge gas between two substrates on which discharge electrodes are formed, and thereby causes a flat panel display to implement a desired number, letter, or graphic by exciting the fluorescent material of the phosphor layer by the generated ultraviolet rays. 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.

Referring to FIG. 1, the plasma display panel 100 includes a front substrate 110 and a rear substrate 120 disposed to face the front substrate 110.

One side of the front substrate 110, the sustain electrode 130 having an X electrode 131, a Y electrode 132, and a bus electrode 133 electrically connected to the X and Y electrodes 131 and 132. ), A front dielectric layer 140 filling the sustain electrode 130, and a passivation layer 150 coated on a surface of the front dielectric layer 140.

On one surface of the rear substrate 110, an address electrode 160 disposed in a direction crossing the sustain electrode 130, a rear dielectric layer 170 filling the address electrode 160, the front and rear substrates The partition wall 180 disposed between the (110) and 120 and the phosphor layer 190 of red, green, and blue applied to the inside of the partition wall 180 is included.

The plasma display panel 100 having the above structure selects a discharge cell for emitting light by applying an address voltage between the Y electrode 131 and the address electrode 160, and maintains it between the X and Y electrodes 131 and 132. When the discharge voltage is applied, surface discharge occurs in the front dielectric layer 140 and the discharge region on the surface of the protective film layer 150 to generate ultraviolet rays, and the fluorescent material of the phosphor layer 190 is excited by the generated ultraviolet rays. Or a video is implemented.

However, the conventional plasma display panel 100 has the following problems.

First, the discharge starts from the gap between the X and Y electrodes 131, 132 and spreads to both ends of the electrodes 131, 132, but spreads along one plane from one side of the front substrate 110. Therefore, the utilization of the entire discharge space is low.

Second, since the sustain electrode 130, the front dielectric layer 140, and the passivation layer 150 are formed along the inner surface of the front substrate 110, the transmittance of visible light is less than 60%, so that a high-efficiency flat panel display device is provided. There is a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a plasma display panel having a high utilization of the discharge space because the discharge electrode is disposed along the circumference of the discharge space.

Another object of the present invention is to provide a plasma display panel which can lower the discharge start voltage by changing the shape of the discharge electrode.

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 defining a discharge space together with the front and rear substrates;

A sustain electrode having an X electrode and a Y electrode disposed separately along the circumference of the discharge space and 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;

The X and Y electrodes are characterized in that a plurality of discharge parts are formed by varying the interval of at least one portion.

In addition, the discharge portion is characterized in that the thickness of the central portion of the opposing surface of the X and Y electrodes is made thinner than the thickness of the peripheral portion.

In addition, the discharge portion is characterized in that the interval between the center portion of the opposite surface of the X and Y electrodes is wider than the peripheral portion.

Further, the X electrode is disposed adjacent to the front substrate, the Y electrode is disposed adjacent to the rear substrate, characterized in that arranged up and down.

Further, the X and Y electrodes are characterized in that arranged in a rectangular structure along the circumference of each discharge space.

In addition, a partition wall having a shape corresponding to the dielectric wall is further provided between the dielectric wall and the rear substrate, and the phosphor layer is coated on an inner surface of the partition wall.

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.

FIG. 2 is a partial cutaway view of the plasma display panel 200 according to an exemplary embodiment of the present invention.

Referring to the drawings, the plasma display panel 200 includes a front substrate 210 and a rear substrate 220 disposed in parallel with the front substrate 210. The front and rear substrates 210 and 220 are sealed with frit glass applied along edges of opposed inner surfaces thereof.

The front substrate 210 is made of a transparent substrate such as soda lime glass.

The back substrate 220 is also made of substantially the same material as the front substrate 210. The address electrode 230 is disposed on an inner surface of the rear substrate 220. The address electrode 230 is formed of a plurality of strips, disposed in a direction parallel to the Y direction of the substrate 220, and spaced apart from each other by a predetermined interval in the X direction. The address electrode 230 extends across each unit discharge cell disposed adjacent to the Y direction. The address electrode 230 is made of a metal material having excellent conductivity, such as silver paste or chromium-copper-chromium (Cr-Cu-Cr).

The address electrode 230 is buried by the dielectric layer 240. The dielectric layer 240 is coated on the entire surface using a transparent dielectric such as high dielectric material such as PbO-B ₂ O ₃ -SiO ₂ . Alternatively, the address electrode 230 may be selectively embedded only in the patterned portion.

A dielectric wall 250 is disposed between the front and rear substrates 210 and 220 to define a discharge space therebetween. The dielectric wall 250 is made of a highly dielectric material in which various fillers are added to a glass paste. The dielectric wall 250 may include a first dielectric wall 251 disposed in a direction (X direction) orthogonal to the address electrode 230, and a first dielectric wall 251 arranged in a direction (Y direction) parallel to the address electrode 230. Two dielectric walls 252 are included. The second dielectric wall 252 extends integrally in a direction opposite from the inner side walls of the pair of adjacent first dielectric walls 251 to define a grid-shaped discharge space.

Alternatively, the dielectric wall 250 may have various types of embodiments, such as a meander type, a delta type, and a hexagon. In addition, the discharge space defined by the dielectric wall 250 may be replaced with a polygonal shape, a circular shape, or another shape as long as the discharge space may be partitioned in addition to the quadrangle.

The storage electrode 280 is disposed in the dielectric wall 250. The sustain electrode 280 includes an X electrode 260 disposed relatively adjacent to the front substrate 210, and a Y electrode 270 disposed relatively adjacent to the rear substrate 220.

The Y electrode 270 is disposed below the X electrode 260. Since the X and Y electrodes 260 and 270 are electrically insulated, different voltages may be applied. The X and Y electrodes 260 and 270 are disposed along the circumference of the discharge space. Accordingly, the X and Y electrodes 260 and 270 form a closed loop for each discharge space. In this case, the X and Y electrodes 260 and 270 are formed to have different thicknesses between the center portion and the peripheral portion of the electrode.

The inner surface of the dielectric wall 250 is formed of a material such as magnesium oxide (MgO) such that ions generated inside the substrate 210 along the four sides of the discharge space emit secondary electrons by interaction with the surface. The protective film layer 290 is formed.

A partition wall 310 may be further provided between the dielectric wall 250 and the rear substrate 220. The partition wall 310 is made of a low dielectric material, unlike the dielectric wall 250. The partition wall 310 is disposed in substantially the same shape on the portion corresponding to the dielectric wall 250.

That is, the barrier rib 310 may include a first barrier rib 311 disposed in a direction (X direction) orthogonal to the address electrode 230 and a first barrier rib arranged in a direction (Y direction) parallel to the address electrode 230. Two partitions 312 are provided. The first and second partitions 311 and 312 are integrally coupled to each other to form a lattice shape.

As such, when only the dielectric wall 250 is formed between the front and back substrates 210 and 220, the dielectric wall 250 has a structure for defining a discharge space that is a single wall, and the dielectric wall 250 and the partition wall 310 are both faced together. And when formed between the back substrates 210 and 220, a double wall made of a material having different dielectric constants has a structure that defines a discharge space.

Meanwhile, in the discharge space partitioned by the front and rear substrates 210 and 220, the dielectric wall 250, and the partition wall 310, neon (Ne) -xenon (Xe) or helium (He) -xenon A mixed gas such as (Xe) is injected.

In addition, red, green, and blue phosphor layers 320 that are excited by ultraviolet rays generated from the discharge gas and emit visible light are formed. In this case, the phosphor layer 320 may be coated on any surface of the discharge space, but is preferably applied to a predetermined thickness on the inner surface of the partition 310 and the upper surface of the dielectric layer 240.

FIG. 3 illustrates the discharge electrode of FIG. 2 separately.

Referring to the drawing, the address electrode 230 is disposed in the Y direction. The address electrode 230 has a strip shape and extends across each discharge space S indicated by a dotted line.

The X electrode 260 is disposed in a direction crossing the address electrode 230. The X electrode 260 is disposed in a substantially rectangular structure for each unit discharge cell along the circumference of the discharge space. The X electrodes 260 are connected to each other between adjacent electrodes arranged in the X direction, and the same voltage is applied. The X electrodes 260 are separated from each other between the electrodes arranged in the Y direction, and different voltages are applied thereto.

Accordingly, the X electrode 260 has a ladder structure connected to each other between adjacent electrodes in the X direction, and has a structure in which the electrodes of the ladder structure are spaced apart by a predetermined interval along the Y direction.

The Y electrode 270 is separated from the bottom of the X electrode 260 and has a strip structure disposed in parallel with the X electrode 260. Similarly to the X electrode 260, the Y electrode 270 has a ladder shape connected to each other between adjacent electrodes disposed along the X direction, and the electrodes having a ladder structure are spaced apart from each other at predetermined intervals along the Y direction.

As described above, the X and Y electrodes 260 and 270 are embedded in the dielectric wall 250 in a state where they are separated by a predetermined interval up and down. The X and Y electrodes 260 and 270 are preferably made of a metal material having excellent conductivity, such as silver paste or chromium-copper-chromium (Cr-Cu-Cr).

Here, the X and Y electrodes 260 and 270 are formed to have different thicknesses between the center portion and the peripheral portion of each electrode along the surfaces facing each other.

That is, the X electrode 260 has a rectangular structure along the circumference of each discharge space S, and the plurality of first X electrode portions 261 disposed to face each other in a direction parallel to the address electrode 230. And a plurality of second X electrode portions 262 disposed to face each other in a direction orthogonal to the address electrode 230. Each of the first and second X electrode parts 261 and 262 has an end portion connected integrally with each other to form a rectangular structure.

The thickness of the central portion 263 of the surface of the first X electrode portion 261 that faces the Y electrode 270 is relatively thinner than that of the peripheral portion 265. In addition, the thickness of the center portion 264 of the surface of the second X electrode portion 262 facing the Y electrode 270 is relatively thinner than that of the peripheral portion 266.

The Y electrode 270 is also disposed to face each other in a direction orthogonal to the plurality of first Y electrode portions 271 arranged to face each other in a direction parallel to the address electrode 230. A plurality of second Y electrode portions 272 is included. The first and second Y electrode portions 271 and 272 are integrally coupled to each other to form a rectangular structure. The Y electrode 270 is substantially the same shape as the X electrode 260.

In addition, the thickness of the center portion 273 of the surface of the first Y electrode portion 271 that faces the X electrode 260 is relatively thinner than the thickness of the peripheral portion 275. The thickness of the center portion 274 of the surface of the second Y electrode portion 272 facing the X electrode 260 is relatively thinner than that of the peripheral portion 276.

4 illustrates a unit discharge cell cut along a line I-I in a state in which the panel 200 of FIG. 2 is coupled.

Referring to the drawings, a dielectric wall 250 defining a discharge space is disposed between the front and rear substrates 210 and 220, and an X electrode 260 and a Y electrode are disposed inside the dielectric wall 250. 270 is arrange | positioned separately and up and down.

A partition wall 310 having a shape corresponding to the dielectric wall 250 is disposed between the dielectric wall 250 and the rear substrate 220, and red, green, and blue colors are discharged to each inner side of the partition wall 310. Phosphor layer 320 is formed.

The red, green, and blue phosphor layers 320 are formed of respective phosphors, and the red phosphor layer is composed of (Y, Gd) BO ₃ ; Eu ⁺³ , and the green phosphor layer is Zn ₂ SiO _4. It is preferable that it is made of: Mn ²⁺ and the blue phosphor layer is made of BaMgAl ₁₀ O ₁₇ : Eu ²⁺ .

In this case, the first and second X electrode portions 261 and 262 are formed to have a thickness smaller than the thicknesses of the peripheral portions 265 and 266 of the central portions 263 and 264 of the surface facing the Y electrode 270. It is. In addition, the thicknesses of the surfaces 273 and 274 facing the X electrodes 260 are smaller than those of the peripheral portions 275 and 276 of the first and second Y electrode portions 271 and 272. .

Meanwhile, the center portions 263 and 264 of the first and second X electrode portions 261 and 262 may be aligned with the center portions 273 and 274 of the first and second Y electrode portions 271 and 272. It is formed at a position corresponding to each other.

As such, a gap between the central portions 263 and 264 of the first and second X electrode portions 261 and 262 and the central portions 273 and 274 of the first and second Y electrode portions 271 and 272. (g ₁ ) denotes peripheral portions 265 and 266 of the first and second X electrode portions 261 and 262 and peripheral portions 275 and 276 of the first and second Y electrode portions 271 and 272. It is formed relatively larger than the gap g ₂ in.

Accordingly, the first and second X electrode portions 261 and 262 and the first and second Y electrode portions 271 and 272 have a gap g ₁ at the central portions 263 to 274, and a positive amount. Since the sizes of the gaps g ₂ at the peripheral portions 265 to 276 on the sides are different from each other, three initial discharge portions are formed along opposite surfaces of the X and Y electrodes 260 and 270. Doing.

The operation of the plasma display panel 210 having the above structure will be described below.

First, when a predetermined address voltage is applied between the address electrode 230 and the Y electrode 270 from an external power source, the discharge cell to emit light is selected. Wall charges are accumulated on the Y electrode 270 of the selected discharge cell.

Subsequently, when a voltage of “+” is applied to the X electrode 260 and a voltage higher than this is applied to the Y electrode 270, the wall is caused by the voltage difference applied between the X and Y electrodes 260 and 270. 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 such discharge may occur from a gap between the X electrode 260 and the Y electrode 270 in which a relatively strong electric field is formed. Becomes high.

As a result, since the X electrode 260 and the Y electrode 270 are formed along the four sides of the discharge space, the possibility of discharge is greatly increased.

Subsequently, if the voltage difference between the X electrode 260 and the Y electrode 270 is still sufficiently large as time passes, the electric field formed between the two electrodes 260 and 270 is gradually concentrated so that the discharge is discharged. It spreads throughout the space.

Since the discharge in this embodiment is generated 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 along the side of the discharge space and diffused to the center portion, the volume thereof is greatly increased, the amount of visible light is greatly increased, and the plasma is concentrated in the center portion of the discharge space, thereby utilizing the space charge. It is possible to achieve low voltage driving, and the effect of improving luminous efficiency can be obtained.

If the voltage difference between the X and Y electrodes 260 and 270 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, when the polarities of the voltages applied to the X and Y electrodes 260 and 270 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 260 and 270 are immediately changed, 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 320 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.

Here, in the quadrangular X electrode 260 and the Y electrode 270 disposed along the circumference of the discharge space, the center portions 263 to 274 of the surfaces facing each other have a larger gap than the peripheral portions 265 to 276. Three initial discharge parts are formed.

Accordingly, the discharge starts from the narrow peripheral portions 265 to 276, and the diffusion is gently induced to the relatively wide central portions 263 to 74, thereby achieving a uniform discharge.

As described above, the plasma display panel of the present invention can obtain the following effects by forming different intervals between the center portion and the peripheral portion between the X and Y electrodes.

First, since there are a plurality of discharge parts, the discharge spreads slowly and uniform discharge is possible.

Second, the diffusion of the discharge can be induced while lowering the discharge start potential.

Third, stable sustain discharge between the X electrode and the Y electrode is enabled.

Fourth, it is possible to secure a wide voltage margin to enable a stable discharge of the panel.

Fifth, the discharge surface is greatly expanded along the side of the discharge space.

Sixth, the aperture ratio is greatly improved as the discharge electrode or the dielectric layer filling it is not formed on the inner surface of the substrate facing the discharge space.

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 an exploded perspective view illustrating a portion of a plasma display panel according to a conventional example;

2 is an exploded perspective view of a plasma display panel partially cut out according to an embodiment of the present invention;

3 is an exploded perspective view illustrating the discharge electrode of FIG. 2 separately;

4 is an enlarged cross-sectional view of a unit discharge cell of the plasma display panel of FIG. 2.

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

200 ... plasma display panel 210 ... front substrate

220 ... back substrate 230 ... address electrode

240 dielectric layer 250 dielectric wall

260 ... X electrode 270 ... Y electrode

280 holding electrode 290 protective layer

310.Bulkhead 320 ... Phosphor layer

Claims (9)

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 defining a discharge space together with the front and rear substrates; A sustain electrode having an X electrode and a Y electrode disposed separately along the circumference of the discharge space and 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; Wherein the X and Y electrodes are formed with a plurality of discharge parts at different intervals of at least one portion. The method of claim 1, And the discharge portion is formed by making the thickness of the central portion of the opposing surfaces of the X and Y electrodes thinner than the thickness of the peripheral portion. The method of claim 1, And the gap between the center portion of the discharge portion and the discharge portion of the discharge electrode Y is wider than the gap between the peripheral portions. The method of claim 1, And the X electrode is disposed adjacent to the front substrate, and the Y electrode is disposed adjacent to the rear substrate and disposed upside down. The method of claim 4 And the X and Y electrodes are arranged in a rectangular structure along the circumference of each discharge space. 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 the X and Y electrodes have a ladder structure electrically connected between other X and Y electrodes arranged in adjacent discharge spaces in one direction. The method of claim 1, And a partition having a shape corresponding to the dielectric wall between the dielectric wall and the back substrate, and the phosphor layer is applied to an inner surface of the partition wall. 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.