KR20050109205A - Plasma display panel - Google Patents

Abstract

A plasma display panel is disclosed. The present invention provides a substrate comprising: a front substrate; a rear substrate disposed to face the substrate; a dielectric wall disposed between the plurality of substrates; and X and Y electrodes separately disposed along the circumference of the discharge space and embedded in the dielectric wall. A sustain electrode provided; an address electrode disposed on the rear substrate; and a red, green, and blue phosphor layer applied on the dielectric wall. The phosphor layer is disposed along the circumference of the discharge space. Since the discharge space is enlarged, the light emission efficiency is improved, and the trigger electrode is inserted between the X and Y electrodes, thereby enabling low voltage sustain voltage 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 a high brightness and having an improved structure to enable low voltage driving.

In general, the plasma display panel injects and discharges a sealed discharge gas between two substrates on which the discharge electrodes are formed, and excites the fluorescent material of the phosphor layer by the ultraviolet rays generated thereby to implement desired numbers, letters, or graphics. 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 conventional plasma display panel 100 includes a front substrate 110, a rear substrate 120 disposed to face the front substrate 110, and an inner surface of the front substrate 110. A sustain electrode 130 having a formed X electrode 131, a Y electrode 132, a bus electrode 133 electrically connected to the X and Y electrodes 131, 132, and the sustain electrode 130. ) Is formed on the inner surface of the back substrate 120, the front dielectric layer 140, the protective layer 150 coated on the surface of the front dielectric layer 140, and intersects with the sustain electrode 130. An address electrode 160 disposed in a direction to be oriented, 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 the It includes a red, green, blue phosphor layer 190 applied to the inside of the partition wall 180.

The plasma display panel 100 having the above structure applies an address voltage between the Y electrode 132 and the address electrode 160, and applies a sustain discharge voltage between the X and Y electrodes 131 and 132. Surface discharge occurs in the discharge regions on the surfaces of the dielectric layer 140 and the passivation layer 150 to generate ultraviolet rays. 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 has a storage electrode 130, a front dielectric layer 140, and a protective layer along an inner surface of the front substrate 110 through which visible light generated from the phosphor layer 190 passes. Since 150 is formed, there is a problem that the transmittance of visible light is only about 60%.

Second, 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, that is, a discharge electrode 130 is formed in the upper direction of the discharge space. Therefore, luminous efficiency is low.

Third, low-voltage sustain discharge and addressing discharge are difficult.

Fourth, since the discharge space is narrow, the 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.

SUMMARY OF THE INVENTION 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 phosphor layer is provided along side surfaces of a discharge space to improve luminance of a substrate.

Another object of the present invention is to provide a plasma display panel having an improved structure of a discharge electrode to enable low voltage driving.

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

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 disposed 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; And

And red, green, and blue phosphor layers coated on the dielectric walls.

In addition, a recess having a predetermined depth is formed in the dielectric wall, and a phosphor layer is formed in the recess.

Furthermore, the phosphor layer is formed between the X and Y electrodes.

In addition, a trigger electrode is further installed in the dielectric wall for low voltage driving.

In addition, the trigger electrode is located between the X and Y electrodes, characterized in that disposed in parallel with the X and Y electrodes.

Furthermore, a trigger electrode is further provided on the inner surface of the front substrate for low voltage driving.

In addition, the trigger electrode is characterized in that disposed in the recess of a predetermined depth formed on the front substrate facing the discharge space.

The sustain electrode may extend in one direction, and the address electrode may extend to cross the sustain electrode in a discharge space.

In addition, the X and Y electrodes are characterized in that the ladder shape electrically connected between the other X and Y electrodes disposed in the discharge space adjacent in one direction.

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 illustrates a partial cutaway view of the plasma display panel 200 according to the first 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 back substrates 210 and 220 are sealed to each other by frit glass.

The front substrate 210 is made of a transparent substrate such as soda lime glass. On the inner surface of the front substrate 210, a protective film layer 230 made of a material such as magnesium oxide (MgO) is formed so that ions generated inside the panel emit secondary electrons by interaction with the surface. The passivation layer 230 is applied over the entire area along the inner surface of the front substrate 210.

The back substrate 220 is also made of substantially the same material as the front substrate 210. The address electrode 240 is disposed on an inner surface of the rear substrate 220. The address electrode 240 is a strip positioned in a direction parallel to the Y direction, and is disposed to be spaced apart by a predetermined interval in the X direction. The address electrode 240 is formed across each unit discharge cell, and is made of a metal material having excellent conductivity, for example, silver paste.

The address electrode 240 is buried by the dielectric layer 250. The dielectric layer 250 completely fills the address electrode 240 using a transparent dielectric such as PbO-B ₂ O ₃ -SiO ₂ . Alternatively, only the portion where the address electrode 240 is patterned may be buried.

A dielectric wall 260 is disposed between the front and rear substrates 210 and 220 to define a discharge space therebetween. The dielectric wall 260 is formed by adding various fillers to glass paste. The dielectric wall 260 may include a first dielectric wall 261 disposed in a direction (X direction) orthogonal to the address electrode 240, and a first dielectric wall 261 arranged in a direction (Y direction) parallel to the address electrode 240. Two dielectric walls 262 are included. The second dielectric wall 262 integrally extends in a direction opposite from the inner side walls of the pair of adjacent first dielectric walls 261 to define a substantially grid-shaped discharge space.

Alternatively, the dielectric wall 260 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 this embodiment, it may be said that the discharge space may be replaced with another shape such as a triangle, a hexagon, or an oval.

In addition, a partition wall may be formed separately between the back substrate 220 and the dielectric wall 260. When only the dielectric wall 260 is formed between the front and back substrates 210 and 220, a single wall divides the discharge space, and the dielectric wall 260 and the partition wall are both the front and back substrates 210. When formed between the 220, a double wall made of a material having a different dielectric constant divides the discharge space.

The storage electrode 270 is disposed in the dielectric wall 260. The sustain electrode 270 includes an X electrode 271 disposed relatively adjacent to the front substrate 210, and a Y electrode 272 disposed relatively adjacent to the rear substrate 220. The Y electrode 272 is disposed below the X electrode 271. Since the X and Y electrodes 271 and 272 are electrically insulated, different voltages may be applied.

In addition, a trigger electrode 280 is provided between the X electrode 271 and the Y electrode 272. The trigger electrode 280 is a low voltage sustain voltage driving during sustain discharge between the X and Y electrodes 271 and 272 or priming particles during addressing discharge between the Y electrode 272 and the address electrode 240. It is inserted to enable low-voltage addressing voltage driving with active movement.

The X and Y electrodes 271 and 272 and the trigger electrode 280 interposed therebetween are disposed along the circumference of the discharge space. Accordingly, the X and Y electrodes 271 and 272 and the trigger electrode 280 form a closed loop for each discharge space.

Meanwhile, a mixed gas such as neon (Ne) -xenon (Xe) or helium (He) -xenon (Xe) is formed in the discharge space partitioned by the front and rear substrates 210 and 220 and the dielectric wall 260. Is injected and red, green, and blue phosphor layers 290 are excited by ultraviolet rays generated from the discharge gas and emit visible light. In this case, the phosphor layer 290 may be coated on any surface of the discharge space, but is preferably formed on the front surface of the dielectric wall 260.

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

Referring to the drawing, the address electrode 240 is disposed in the Y direction. The address electrode 240 has a strip shape and extends across each discharge space indicated by a dotted line.

The X electrode 271 is disposed in a direction crossing the address electrode 240. The X electrode 271 is disposed in a substantially rectangular shape for each unit discharge cell along the circumference of the discharge space. The X electrodes 271 are connected to each other between adjacent electrodes arranged in the X direction, and the same voltage is applied. The electrodes arranged in the Y direction are separated from each other, and different voltages are applied to the X electrodes 271.

Accordingly, the X electrode 271 has a ladder shape connected to each other between adjacent electrodes in the X direction, and has a structure in which ladder-shaped electrodes are spaced apart at predetermined intervals in the Y direction.

The Y electrode 272 is separated below the X electrode 271 and has a strip shape disposed in parallel with the X electrode 271. Like the X electrode 271, the Y electrode 272 has a ladder shape connected to each other between adjacent electrodes arranged in the X direction, and has a structure in which ladder-shaped electrodes are spaced apart at predetermined intervals along the Y direction.

The trigger electrode 280 is disposed between the X and Y electrodes 271 and 272. The trigger electrode 280 is substantially the same shape as the X and Y electrodes 271 and 272 and is disposed in the same direction as the direction in which the X and Y electrodes 271 and 272 are disposed.

As described above, the X and Y electrodes 271 and 272 and the trigger electrode 280 are buried in the dielectric wall 260 at predetermined intervals. In addition, the X and Y electrodes 271 and 272 and the trigger electrode 280 is preferably made of a metal material having excellent conductivity, such as silver paste or chromium-copper-chromium (Cr-Cu-Cr).

Meanwhile, the X and Y electrodes 271 and 272 and the trigger electrode 280 are composed of a plurality of electrodes for each electrode or at least one electrode in plurality, depending on whether the panel is a counter discharge type or a discharge type. It may be formed, but is not limited to this embodiment.

In addition, the X and Y electrodes 271 and 272 and the trigger electrode 280 disposed along the circumference of the discharge space adjacent to each other in the direction (X direction) crossing the address electrode 240 are not only ladder-shaped, but also each unit. Square electrodes are disposed along the circumference of the discharge space, and adjacent electrodes may be connected to each other by a conductive connecting member.

4 illustrates a unit discharge cell in a state in which the panel 200 of FIG. 2 is coupled.

Referring to the drawings, the passivation layer 230 is formed on the entire inner surface of the front substrate 210. An address electrode 240 is disposed on an inner surface of the back substrate 220 disposed in parallel with the front substrate 210, and the address electrode 240 is buried by the dielectric layer 250.

In addition, a dielectric wall 260 is formed between the front and rear substrates 210 and 220 to define a discharge space. An X electrode 271 and a trigger electrode 280 are disposed in the dielectric wall 260. And the Y electrode 272 are arranged to be separated from each other.

In this case, a recess 261 is formed in the dielectric wall 260 along the inner surface of the dielectric wall 260. The concave portion 261 is formed to a predetermined depth from the front surface of the dielectric wall 260 along the circumference of the discharge space. The position of this recess 261 is located between the X and Y electrodes 271 and 272.

In the concave portion 261, red, green, and blue phosphors which are excited by ultraviolet rays generated from discharge gas divided into the dielectric wall 260 and the front and rear substrates 210 and 220 to emit visible light. Layer 290 is formed.

The red, green, and blue phosphor layers 290 are formed of respective phosphors, and the red phosphor layer is made 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 order to form the phosphor layer 290 in the dielectric wall 260 in which the concave portion 290 is formed, the dielectric wall 260 is stacked by stacking raw materials for the dielectric wall 260 by a method such as screen printing several times. While forming the recess 290 in the process of forming it is possible by the method of stacking the phosphor layer 290 through this.

Alternatively, the phosphor layer 290 may be formed on the surface of the dielectric wall 260 at a position corresponding to the recess 290 without forming the recess 290. In addition, it may be formed by coating to extend from the surface of the dielectric layer 250 to the surface of the dielectric wall 260 in which the trigger electrode 280 is disposed.

As a result of this structure, the discharge space is increased, and the discharge area can be enlarged, so that the amount of plasma is increased, so that even when a high concentration, for example, 10% by volume of xenon gas is used as the discharge gas, low voltage driving is possible, thereby making the luminous efficiency efficient. It can greatly improve the

The operation of the plasma display panel 200 having the above structure will be described below.

First, when a predetermined address voltage is applied between the address electrode 240 and the Y electrode 272 from an external power source, the discharge cells to emit light are selected. Wall charges are accumulated on the Y electrode 240 of the selected discharge cell.

Subsequently, if a voltage of "+" is applied to the X electrode 271 and a voltage higher than this is applied to the Y electrode 272, the wall is caused by the voltage difference applied between the X and Y electrodes 271 and 272. 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 271 and the Y electrode 272 in which a relatively strong electric field is formed. The probability is high.

Thereby, since the X electrode 271 and the Y electrode 272 are formed along the side surface of the discharge space, the possibility that a discharge generate | occur | produced will increase significantly.

Subsequently, if the voltage difference between the X electrode 271 and the Y electrode 272 is still sufficiently sufficiently maintained over time, the electric field formed between the two electrodes 271 and 272 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 diffuses to the center portion, the volume 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. The electric charge can be utilized to enable low voltage driving, and the light emitting efficiency can be improved.

If the voltage difference between the X and Y electrodes 271 and 272 is lower than the discharge voltage after the discharge is formed in this manner, the discharge no longer occurs, and space charge and wall charge are formed in the discharge space. At this time, if the polarities of the voltages applied to the X and Y electrodes 271 and 272 are reversed, the discharge is generated again with the help of wall charges. In this way, if the polarities of the X and Y electrodes 271 and 272 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 290 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, since the trigger electrode 280 is inserted between the X and Y electrodes 271 and 272, the trigger pulse is applied in the reset period (R) as shown in FIG. 5 to move the priming particles in the discharge space. In this case, the addressing voltage required for the counter discharge between the selected address electrode A lines and the Y electrode lines in the subsequent address section R can be lowered.

Further, in the sustain period S, while a sustain pulse is alternately applied to all the X and Y electrode lines, while the discharge for the sustain is applied in the discharge cells in which the wall charges are formed in the corresponding address period R, the trigger is applied. A trigger pulse is also applied to the electrode T to enhance sustain discharge.

6 illustrates a plasma display panel 600 according to a second embodiment of the present invention.

Referring to the drawings, the plasma display panel 600 includes a front substrate 610, a rear substrate 620 disposed opposite to the front substrate 610, a protective layer 630 coated on an inner surface of the front substrate 610, and And an address electrode 640 patterned on an inner surface of the back substrate 620, and a dielectric layer 650 filling the address electrode 640.

In addition, a dielectric wall 660 is formed between the front and rear substrates 610 and 620 to partition the discharge space, and the X and Y electrodes 671 are disposed upside down in the dielectric wall 660. 672 is embedded. The X electrode 671 is disposed relatively close to the front substrate 610, and the Y electrode 672 is disposed relatively close to the rear substrate 620.

In this case, a predetermined depth concave portion 661 is formed in the front portion of the dielectric wall 660. The concave portion 661 is formed along the circumference of the discharge space and is located between the X and Y electrodes 671 and 672. In the recess 661, a fluorescent material of the red, green, and blue phosphor layers 690 is coated for each discharge cell.

In addition, a trigger electrode 680 is formed at a position facing the discharge space of the front substrate 610. The trigger electrode 680 enables low voltage driving by actively moving priming particles in the discharge space during sustain discharge and address discharge.

That is, a recess 611 having a predetermined depth is formed on an inner surface of the front substrate 610, and a trigger electrode 680 is formed in the recess 611. Alternatively, the trigger electrode 680 may be formed with a predetermined thickness on the surface of the front substrate 610 without forming a predetermined depth groove on the front substrate 610, and may be embedded with the protective layer 630. There will be. In this case, the trigger electrode 680 is preferably made of a transparent conductive film, such as an ITO film.

As described above, the plasma display panel of the present invention can obtain the following effects.

First, since the phosphor layer is provided along the circumference of the discharge space, the discharge space is enlarged and the luminous efficiency is greatly improved.

Second, the trigger electrode is inserted between the X and Y electrodes, thereby enabling low voltage sustain voltage driving.

Third, the movement of the priming particles in the discharge space can be activated to lower the addressing voltage.

Fourth, as the electrode of the opaque material is not formed on the substrate facing the discharge electrode, the aperture ratio is greatly improved.

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;

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

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

4 is a cross-sectional view illustrating a unit discharge cell in a state in which the panel of FIG. 2 is coupled;

5 is a waveform diagram of signals applied to the discharge electrode line of FIG. 2;

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

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

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

220 back substrate 230 protective layer

240 ... address electrode 250 ... dielectric layer

260 ... Dielectric wall 271 ... X electrode

272 ... Y electrode 280 ... trigger electrode

290 phosphor layer

Claims (11)

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 disposed 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; And And a red, green, and blue phosphor layer coated on the dielectric wall. The method of claim 1, A recess having a predetermined depth is formed in the dielectric wall, and a phosphor layer is formed in the recess. The method of claim 1, And the phosphor layer is formed between the X and Y electrodes. The method of claim 1, And a trigger electrode is further disposed in the dielectric wall for low voltage driving. The method of claim 4, wherein And the trigger electrode is disposed between the X and Y electrodes and disposed in parallel with the X and Y electrodes. The method of claim 1, And an trigger electrode on the inner surface of the front substrate for low voltage driving. The method of claim 6, And the trigger electrode is disposed in a recess having a predetermined depth formed in the front substrate facing the discharge space. The method of claim 6, The trigger electrode is a plasma display panel, characterized in that the transparent conductive film. 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 shape electrically connected between other X and Y electrodes arranged in adjacent discharge spaces in one direction. The method of claim 1, And a passivation layer is further formed on the inner surface of the front substrate to increase secondary electron emission.