KR20050102749A - Plasma display panel - Google Patents

Abstract

A plasma display panel is disclosed. The present invention provides a semiconductor device comprising: a front substrate; a rear substrate disposed to face the substrate; a dielectric wall disposed between the plurality of substrates and defining a discharge space; and a dielectric wall disposed up and down along an edge of the discharge space. A sustain electrode having a plurality of X and Y electrodes embedded therein; an address electrode disposed between the substrate to cause addressing discharge and the sustain electrode; and a red, green, and blue phosphor layer applied in the discharge space. In addition, as the uneven electrode is formed in the Y electrode to shorten the distance between the address electrodes and lower the addressing discharge voltage, the distance between the address electrode and the Y electrode is shortened. As a result, the discharge voltage can be lowered, thereby enabling low voltage addressing driving.

Description

Plasma display panel {Plasma display panel}

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an improved structure to lower an addressing discharge voltage.

In general, a plasma display panel injects and seals a discharge gas onto a plurality of substrates on which intersecting discharge electrodes are disposed, and then applies a discharge voltage. When the gas emits light in the discharge space due to the discharge voltage, an appropriate pulse voltage is applied. A flat display device that implements a desired number, letter, or graphic by addressing a point where two electrodes intersect by applying a.

Such a 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 direct charge transfer is not performed between the corresponding electrodes. Instead, the ions and electrons generated by the discharge adhere to the surface of the dielectric layer to form a wall voltage. (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, an address electrode and a scan electrode 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 a sustain electrode corresponding to each unit pixel are provided to generate addressing discharge and sustain discharge.

Referring to FIG. 1, the conventional plasma display panel 100 includes a pair of storage electrodes 120 formed on a bottom surface of the front substrate 110, a front dielectric layer 130 filling the storage electrodes 120. It includes a front dielectric layer 140 coated on the surface of the front dielectric layer 130.

An address electrode 160, a back dielectric layer 170 filling the address electrode 160, and a back dielectric layer 170 are disposed on an upper surface of the back substrate 150 disposed to face the front substrate 110. The partition wall 180 disposed to be spaced apart by a predetermined interval, and the red, green, and blue phosphor layers 190 coated on the inner wall of the partition wall 180 and the upper surface of the back dielectric layer 170 are formed.

Meanwhile, an inert gas is encapsulated in the combined inner space of the front and rear substrates 110 and 150 to have a discharge region.

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

As the address voltage is applied between the Y electrode and the address electrode 160 among the sustain electrodes 120 and the sustain discharge voltage is applied between the pair of sustain electrodes 120, the front dielectric layer 130 and the passivation layer 140 are applied. Surface discharge occurs in the discharge region on the surface, and ultraviolet rays are generated. Color display is performed as the fluorescent material of the surrounding phosphor layer 190 is excited by the generated ultraviolet rays.

That is, space charges in the discharge cell are accelerated by the driving voltage applied thereto, and are mainly composed of neon (Ne), an inert mixed gas filled with a pressure of about 400 to 500 Torr in the discharge cell. It collides with the phening mixed gas to which helium (He) and xenon (Xe) gas are added.

Accordingly, 147 nanometers of ultraviolet rays are generated while the inert gas is excited. The generated ultraviolet rays generate visible light as they collide with the fluorescent material of the phosphor layer 190 surrounding the partition wall 180.

However, the conventional plasma display panel 100 includes the sustain electrode 120 and the front dielectric layer 130, which are electrodes which cause discharge along the surface of the front substrate 110 through which visible light generated from the phosphor layer 190 passes. Since the protective layer 140 is formed sequentially, the transmittance of visible light is only about 60%.

In particular, in the conventional plasma display panel 100, since the electrodes causing the discharge are sequentially formed on the inner surface of the front substrate 110 through which visible light, which is the upper side of the discharge space, passes, the discharge is generated and diffused on the inner surface thereof. Luminous efficiency is low. Furthermore, the address discharge characteristic is low as the distance between the sustain electrode 120 and the address electrode 160 is arranged far.

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 in which discharge electrodes are provided along edges of a discharge space to improve transmittance of a substrate.

Another object of the present invention is to provide a plasma display panel in which the address discharge characteristic is improved by shortening the distance between the address electrode and the sustain electrode structure causing the addressing discharge.

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

A sustain electrode disposed up and down along an edge of the discharge space and having a plurality of X and Y electrodes embedded in the dielectric wall;

An address electrode disposed between the substrate and generating an addressing discharge with the sustain electrode;

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

The Y electrode is characterized in that the uneven electrode is formed to reduce the addressing discharge voltage by shortening the distance between the address electrodes.

The uneven electrode may be integrally extended from the lower end of the Y electrode along the direction in which the address electrode is disposed.

In addition, the uneven electrode is characterized in that extend entirely along the edge of the Y electrode.

Further, the uneven electrode is characterized in that partially protruded along the edge of the Y electrode.

In addition, the X and Y electrodes have substantially the same size and width, and the uneven electrode is characterized in that extending from the Y electrode to a predetermined size.

Further, the uneven electrode is characterized in that it is disposed along the edge of the 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 drawing, a plurality of sustain electrodes 220 are disposed on the rear substrate 210. The sustain electrode 220 includes a rectangular unit sustain electrode 221 formed along an edge of each discharge space S. FIG.

The unit sustain electrode 221 is continuously disposed along the X direction of the substrate 210. Adjacent unit sustain electrodes 221 disposed in the X direction are electrically connected by the connecting portions 212. The unit sustain electrode 221 is continuously disposed along the Y direction of the substrate 210. Adjacent unit storage electrodes 221 disposed in the Y direction are disposed to be spaced apart from each other by a predetermined interval, and are not electrically connected by the connecting portion 222. Accordingly, the same voltage is applied to the unit storage electrode 221 disposed in the X direction, and different voltages may be applied to the unit storage electrode 221 disposed in the Y direction.

The address electrode 230 is disposed on the substrate 210 in a direction parallel to the Y direction, which is a direction orthogonal to the sustain electrode 220. The address electrode 230 has a strip shape spaced apart from each other along the X direction. The address electrode 230 intersects with the sustain electrode 220 in the discharge space S. FIG.

When discharging the discharge electrode as described above along the line I-I as shown in FIG.

Here, the same reference numerals as in the above-described drawings indicate the same members having the same function.

Referring to the drawing, the plasma display panel includes a front substrate 290 and a rear substrate 210 disposed to face the front substrate 290.

The address electrode 230 is disposed on the back substrate 210, and the address electrode 230 is buried by the dielectric layer 240. A partition wall 250 is formed on the surface of the dielectric layer 240 to partition the discharge space. Red, green, and blue phosphor layers 260 are coated on the inner surface of the barrier rib 250 and the inner surface of the dielectric layer 240 for each discharge space S. FIG.

The storage electrode 220 is disposed along the edge of the discharge space S between the front substrate 290 and the partition wall 250. The sustain electrode 220 includes an X electrode 223 and a Y electrode 224 disposed separately from the X electrode 223. The X and Y electrodes 223 and 224 are embedded by a dielectric wall 224. A protective film 280 such as a magnesium oxide film (MgO) is formed on an inner surface of the dielectric wall 224.

At this time, the uneven electrode 225 is formed in the sustain electrode 220 to the address electrode 230 and the Y electrode 224 causing the addressing discharge to enable low voltage addressing driving.

In more detail, as shown in FIGS. 4 and 5.

4 is an exploded perspective view illustrating a unit discharge cell of the plasma display panel 400 according to an exemplary embodiment. FIG. 5 is a plan view of the plasma display panel 400 of FIG. 4.

4 and 5, the plasma display panel 400 includes a front substrate 410 and a rear substrate 410 disposed to face the substrate 410. The front substrate 410 and the rear substrate 410 are mutually sealed by frit glass (not shown).

The back substrate 420 is made of a transparent glass substrate such as soda lime glass. The address electrode 430 is disposed on the top surface of the back substrate 420. The address electrode 430 has a strip shape disposed along the Y direction. The address electrode 430 can be formed using a metal material having excellent conductivity, such as silver paste.

The address electrode 430 is buried by the dielectric layer 440. The back dielectric layer 440 completely fills the address electrode 430 using a transparent dielectric such as a dielectric material mainly composed of frit glass. Alternatively, only the portion where the address electrode 430 is patterned may be buried.

A partition wall 450 is formed on the upper surface of the dielectric layer 440 to partition the discharge space S and prevent cross talk between adjacent discharge spaces S. The partition wall 450 may be manufactured in various shapes to partition each unit discharge space.

In the present exemplary embodiment, the partition wall 450 is disposed in a direction (Y direction) parallel to the horizontal partition wall 451 disposed in the direction (X direction) orthogonal to the address electrode 430 and the address electrode 430. The vertical bulkhead 452 is included. The vertical partition wall 452 extends integrally in a direction opposite from the inner wall of the adjacent horizontal partition wall 451. Accordingly, the horizontal and vertical partitions 451 and 452 have a rectangular shape, and thus the discharge space S also maintains a corresponding shape.

Alternatively, the barrier 450 may have various types of embodiments, such as a stripe type, a meander type, or a delta type. In addition, as long as the discharge space is a shape capable of partitioning the discharge space in addition to the quadrangle as in the present embodiment, other shapes such as a triangle, a hexagon, and an ellipse are also possible.

The storage electrode 470 is disposed at an upper end of the partition wall 450. The storage electrode 470 is disposed between the front substrate 410 and the partition wall 450 and is positioned along an edge of the discharge space.

The sustain electrode 470 includes an X electrode 471 disposed relatively adjacent to the front substrate 410, and a Y electrode 472 disposed relatively adjacent to the rear substrate 420.

The X and Y electrodes 471 and 472 are vertically disposed between the front substrate 410 and the partition wall 450. In addition, since the X and Y electrodes 471 and 472 are not electrically connected, voltages can be applied independently of each other during driving. Since the X and Y electrodes 471 and 472 are disposed along the horizontal and vertical partitions 451 and 452 which are integrally coupled, the X and Y electrodes 471 and 472 form a quadrangular shape for each discharge space. In addition, the X and Y electrodes 471 and 472 have substantially the same shape.

In this case, the uneven electrode 473 is formed in the Y electrode 472 to enable low voltage addressing driving. The uneven electrode 473 is integrally formed from the lower end of the Y electrode 473 and extends in the direction in which the address electrode 430 is disposed. The formation of the uneven electrode 473 is for reducing the addressing discharge voltage by making the distance between the address electrode 430 and the Y electrode 473 as short as possible.

Although the distance from the address electrode 430 may be shortened by increasing the size of the entire Y electrode 472, in this case, the X electrode 473 should be made equally large in the manufacturing process, thus consuming excessive raw materials. Will occur. In addition, when the X and Y electrodes 471 and 472 are formed to have a desired size or more, power consumption is high, and a dielectric wall to be described later, which is buried due to a strong electric field effect between the mutual electrodes 471 and 472, is also provided. There is a fear of dielectric breakdown at 480.

In order to prevent this, in the present embodiment, the Y electrode 472 is manufactured to have substantially the same size and width as the X electrode 471, whereas the lower end of the Y electrode 472, that is, the rear surface thereof. The uneven electrode 473 extends integrally from the Y electrode 472 in the direction in which the substrate 420 is disposed to the place where the address electrode 430 is disposed.

In this case, the uneven electrode 473 extends from the entire side along the lower edge of the Y electrode 472 and is disposed to face the address electrode 430. Accordingly, the uneven electrode 473 has a flange portion shape integrally extending from the lower end of the Y electrode 472 into the discharge space. In addition, the uneven electrode 473 has a width enough to be positioned at an upper end of the partition wall 450.

The X electrode 471 and the Y electrode 472 integrally formed with the uneven electrode 473 are embedded by the dielectric wall 480 described above. The dielectric wall 48 is made of a material substantially the same as the dielectric layer 440 of the back substrate 420, for example, a dielectric material mainly composed of frit glass.

The dielectric wall 480 together with the partition wall 450 defines a discharge space and has substantially the same shape as the horizontal and vertical partition walls 451 and 452. The dielectric walls 480 are formed at upper ends of the horizontal and vertical partitions 451 and 452 corresponding thereto. Accordingly, the X and Y electrodes 471 and 472 are vertically disposed in the dielectric wall 480 along the edge of the discharge space, and the uneven electrode 473 is also disposed within the dielectric wall 480. Positioning

Alternatively, the partition wall 450 is not formed, and the dielectric wall 480 extends to an area up to a portion where the horizontal and vertical partition walls 451 and 452 are formed, thereby serving as the partition wall 450. You could do it.

A protective film 490 made of magnesium oxide is formed on the inner surface of the dielectric wall 480 to protect it and emit secondary electrons. The passivation layer 490 is generally applied along the inner surface of the dielectric wall 480. The passivation layer 490 is not limited to any one, such as to further form a carbon-based material such as carbon nanotubes to maximize secondary electron emission.

On the other hand, the X and Y electrodes on the inner surface of the front substrate 410 coupled to the back substrate 420, the dielectric layer to embed it, or the protective layer is coated on the surface of the dielectric layer is not formed It is a state. Accordingly, it can be said that the aperture ratio of the front substrate 410 is greatly improved.

In addition, the discharge space S partitioned by the front substrate 410, the dielectric wall 480, the partition wall 450, and the dielectric layer 440 is excited by ultraviolet rays generated from the discharge gas to emit visible light. An emitting phosphor layer 460 is formed. When implementing a color image, red, green, and blue phosphor layers 460 are applied to respective discharge spaces. The phosphor layer 460 may be formed in any portion of the discharge space S, but is preferably applied along the inner surface of the dielectric layer 440 and the inner wall of the partition wall 450 in consideration of the transmittance of visible light.

Due to the above-described structure, the discharge surface increases and the discharge region can be enlarged in the discharge space S, so that the amount of plasma increases, so that low-voltage driving is possible even when a high concentration, for example, 10 volume percent of xenon gas is used as the discharge gas. As a result, the luminous efficiency can be significantly improved.

Referring to the operation of the plasma display panel 400 having the above structure is as follows.

First, when a predetermined address voltage is applied between the address electrode 430 and the Y electrode 472 from an external power source, the discharge space S to be emitted is selected. Wall charges are accumulated on the Y electrode 472 in the selected discharge space S.

Subsequently, when a voltage of “+” is applied to the X electrode 471 and a voltage higher than this is applied to the Y electrode 472, the wall is caused by the voltage difference applied between the X and Y electrodes 471 and 472. The charge will move.

The movement of the wall charges generates a plasma by colliding with the discharge gas atoms in the discharge space S, and the discharge is adjacent to the X electrode 471 and the Y electrode 472 in which a relatively strong electric field is formed. It is more likely to occur from the part.

Accordingly, since the X electrode 471 and the Y electrode 472 are formed along the side surface of the discharge space S, the discharge is compared with the prior art in which a close portion of the discharge electrode is formed only on the upper surface of the discharge space S. FIG. The likelihood of this is greatly increased.

Subsequently, if the voltage difference between the X electrode 471 and the Y electrode 472 is still sufficiently large over time, the electric field formed between the two electrodes 471 and 472 is gradually concentrated so that the discharge is discharged. It spreads to the entire space S.

At this time, since the uneven electrode 473 integrally formed at the lower end of the Y electrode 472 extends to the place where the address electrode 430 is disposed, the distance between the address electrode 430 and the Y electrode 472 is shortened. Thus, the addressing discharge voltage can be lowered. Thus, low voltage addressing driving is possible.

Since the discharge in this embodiment is generated in a ring type at four sides of the discharge space S and diffuses to the center of the discharge space S, the conventional discharge is generated at one upper surface of the discharge space S and is centered. The diffusion range is greatly increased than in the case of diffusion.

In addition, since the plasma generated by the discharge is formed in a ring type along the side of the discharge space (S) and diffused to the center portion, the volume is greatly increased, the amount of visible light is greatly increased, the plasma is discharge space (S) By concentrating on the center portion of the space charge can be utilized to enable low-voltage driving, it is possible to obtain the effect of improving the luminous efficiency.

In addition, since the plasma is concentrated in the center of the discharge space S, and the electric fields by the X and Y electrodes 471 and 472 are formed on both sides of the plasma, the charge is concentrated in the center of the discharge space S so that the phosphor Ion sputtering to the layer 460 can be prevented at the source.

If the voltage difference between the X and Y electrodes 471 and 472 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 S. do. At this time, if the polarities of the voltages applied to the X and Y electrodes 471 and 472 are reversed, the discharge is generated again with the help of the wall charge. If the polarities of the X and Y electrodes 471 and 472 are immediately changed, the initial discharge process is repeated. The discharge is stably generated while repeating this process.

6 is a cross-sectional view illustrating a unit discharge cell of the plasma display panel 60 according to the second embodiment of the present invention, and FIG. 7 is a plan view cut along the line II-II of FIG. 6.

6 and 7, the plasma display panel 60 includes a front substrate 610 and a back substrate 620. A strip-shaped address electrode 630 is formed on an upper surface of the rear substrate 620, and the address electrode 630 is buried by a dielectric layer 640. A partition wall 650 is formed on the top surface of the dielectric layer 640 to partition the unit discharge space S, and the inner wall of the partition wall 650 and the inner surface of the dielectric layer 640 correspond to each unit discharge space. Green and blue phosphor layers 660 are applied.

In addition, a sustain electrode 670 is disposed between the front substrate 610 and the partition wall 650 along the edge of the discharge space, and the sustain electrode 670 is vertically disposed between the X electrode 671 and the Y electrode. An electrode 672 is included. The sustain electrode 670 is buried by the dielectric wall 680, and a protective film 690 is formed on the surface of the dielectric wall 680. On the other hand, on the inner surface of the front substrate 610, no discharge electrode, dielectric layer, or the like is formed on the inner surface of the front substrate 610 to face the discharge space.

At this time, the Y electrode 672 is formed with an uneven electrode 673 extending integrally therewith.

Unlike the case of the first embodiment, the uneven electrode 673 is not formed along four sides of the lower end of the Y electrode 672, but is formed locally on at least one of the four sides. The uneven electrode 673 extends from opposite sides of the Y electrode 672 to protrude to the place where the address electrode 630 is disposed.

Accordingly, the distance between the address electrode 630 and the Y electrode 672 is shortened due to the formation of the uneven electrode 673, thereby lowering the addressing discharge voltage.

As described above, in the plasma display panel of the present invention, as the uneven electrode extends in whole or in part from the Y electrode toward the address electrode, the distance between the address electrode and the Y electrode is shortened. As a result, the discharge voltage can be lowered, thereby enabling low voltage addressing driving. In addition, it is possible to drive even at a low voltage, thereby improving luminous efficiency.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. 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 space of a conventional plasma display panel;

2 is a plan view showing a structure in which electrodes of a plasma display according to a first embodiment of the present invention are arranged;

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

FIG. 4 is a perspective view of a partially cut-out unit discharge cell of FIG. 3;

FIG. 5 is a plan view taken along the line I-I of FIG. 3;

6 is a cross-sectional view showing a unit discharge cell according to a second embodiment of the present invention;

7 is a plan view taken along the line II-II of FIG. 6;

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

400 ... plasma display panel 410 ... front substrate

420 ... back board 430 ... address electrode

440 Dielectric Layer 450 Bulkhead

451 ... Horizontal bulkhead 452 ... Vertical bulkhead

460 phosphor layer 470 holding electrode

471 ... X electrode 472 ... Y electrode

473 Uneven electrode 480 Dielectric wall

490 ... protective layer

Claims (10)

A front substrate; A rear substrate disposed to face the front substrate; A dielectric wall disposed between the front substrate and the rear surface and defining a discharge space together with the front and rear substrates; A sustain electrode disposed up and down along an edge of the discharge space and having a plurality of X and Y electrodes embedded in the dielectric wall; An address electrode disposed between the substrate and generating an addressing discharge with the sustain electrode; It includes; red, green, blue phosphor layer applied in the discharge space; And the uneven electrode is formed in the Y electrode to shorten the distance between the address electrodes to lower the addressing discharge voltage. The method of claim 1, And the uneven electrode extends integrally from a lower end of the Y electrode along a direction in which the address electrode is disposed. The method of claim 2, And the uneven electrode extends along the edge of the Y electrode. The method of claim 2, And the uneven electrode partially protrudes along an edge of the Y electrode. The method of claim 1, And the X and Y electrodes have substantially the same size and width, and the uneven electrode extends from the Y electrode to a predetermined size. The method of claim 5, The uneven electrode is disposed along the edge of the discharge space, the plasma display panel. The method of claim 1, And the sustain electrode is disposed in one direction, and the address electrode is disposed in another direction to intersect the sustain electrode in a discharge space. The method of claim 1, And a partition wall is formed between the rear substrate and the dielectric wall to define a discharge space together with the dielectric wall, and the phosphor layer is coated inside 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. The method of claim 1, And the address electrode is disposed between the rear substrate and the phosphor layer, and is embedded by a dielectric layer.