KR20050114090A - Plasma display panel - Google Patents

Abstract

A plasma display panel is disclosed. The present invention provides a dielectric material comprising: a front substrate; and a sustain electrode alternately disposed on the front substrate; the sustain electrode having X and Y electrodes; A back substrate disposed in parallel with the front substrate, an address electrode disposed on the back substrate, a back dielectric layer having the address electrodes embedded therein, and a partition wall disposed between the front and back substrates to define a discharge space. And a black stripe layer disposed in the discharge space, and a red, green, and blue phosphor layer applied inside the partition wall, and as the black stripe layer is formed in the discharge space, the contrast of the panel is improved. The manufacturing process is simplified by placing X and Y electrodes made of ITOless electrodes.

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 in which an electric field concentration unit is formed in a gap between a plurality of ITOless electrodes and a black stripe layer is formed in a discharge space.

In general, a plasma display panel injects and discharges a discharge gas on two substrates on which a plurality of discharge electrodes are formed, and then applies a discharge voltage. When the gas emits light between the electrodes, an appropriate pulse voltage is applied. A flat display device is applied to implement a desired number, letter or graphic by addressing a point where two electrodes cross each other.

The plasma display panel may 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 may 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, the ions and electrons generated by the discharge adhere to the surface of the dielectric layer to form a wall. It is possible to form a wall voltage and to maintain discharge by a sustaining voltage.

In the opposite discharge type plasma display panel, an address electrode and a scan electrode are provided to face each pixel, and addressing discharge and sustain discharge are generated between the two electrodes. On the other hand, in the surface discharge type 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 plasma display panel 100 includes a front substrate 110, a rear substrate 120 disposed to face the front substrate 110, and a bottom surface of the front substrate 110. A sustain electrode 130 having a pair of X and Y electrodes 131 and 132, a bus electrode 133 electrically connected thereto, a front dielectric layer 140 filling the sustain electrode 130, and A protective film layer 150 coated on a surface of the front dielectric layer 140, an address electrode 160 formed on an upper surface of the back substrate 120, a back dielectric layer 170 filling the address electrode 160, And a partition wall 180 provided on the rear dielectric layer 170, and a red, green, and blue phosphor layer 190 coated on an inner surface of the partition wall 180 and a surface of the rear dielectric layer 170.

On the other hand, a discharge gas is sealed in the combined inner space of the front and rear substrates 110 and 120 to form a discharge region S. FIG.

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

A discharge cell for emitting light is selected by applying an address voltage between the Y electrode 132 and the address electrode 160, and a sustain discharge voltage is applied between the X and Y electrodes 131 and 132 to apply the front dielectric layer 140 and the passivation layer. Surface discharge occurs in the discharge region on the surface of the layer 150 to generate ultraviolet rays, and the still image or the moving image is implemented as the fluorescent material of the phosphor layer 190 is excited by the generated ultraviolet rays.

In the conventional plasma display panel 100, in order to improve the discharge efficiency, the discharge path is increased to increase the probability of actively ionizing excitation of gas atoms.

In other words, where the discharge gap is short, the discharge is first started to lower the discharge voltage, and where the discharge gap is long, the efficiency is improved by the generation of charged particles and excitation species concentrated around the electrode during discharge. There is a need. One of such changes in the discharge cell structure is to change the structure of the front panel.

In addition, in the conventional plasma display panel 100, when a high concentration of Xe gas of 10% by volume or more is applied, the generation of charged particles and excitation species increases due to ionization and excitation of atoms, thereby increasing luminance and discharge efficiency. The reason why the high concentration of Xe gas is applied has the disadvantage of increasing the initial discharge voltage (firing voltage).

In addition, the plasma display panel 100 causes color bleeding due to other color emission in an undesired area during driving, thereby degrading display quality and contrast.

Furthermore, since the X and Y electrodes 131 and 132 formed of a transparent conductive film, such as an ITO film, are formed in the discharge space S, the bus electrode 133 made of a metal material electrically connected thereto to improve electrical characteristics. ), The manufacturing process becomes complicated and the manufacturing cost increases.

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 an electric field concentrator is formed between ITOless electrodes to improve discharge efficiency.

Another object of the present invention is to provide a plasma display panel in which a black stripe layer is formed in a discharge space to improve contrast.

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

Front substrate;

Sustain electrodes alternately disposed on the front substrate and having X and Y electrodes;

A front dielectric layer filling the sustain electrode and having at least one electric field concentrator formed between the X and Y electrodes;

A rear substrate disposed in parallel with the front substrate;

An address electrode disposed on the rear substrate and formed in a direction crossing the sustain electrode;

A back dielectric layer having the address electrode embedded therein;

A partition wall disposed between the front and rear substrates to define a discharge space;

A black stripe layer disposed in the discharge space and formed on an inner side of the X and Y electrodes facing each other; And

And red, green, and blue phosphor layers coated inside the partition wall.

In addition, the X and Y electrodes are characterized in that the ITOless electrode.

In addition, the black stripe layer is formed extending from the inner wall of the X and Y electrodes.

Further, the electric field concentrator is a groove having a predetermined depth formed by making the thickness of the front dielectric layer thinner than other portions of the front dielectric layer.

Plasma display panel according to another aspect of the present invention,

Front substrate;

Sustain electrodes alternately disposed on the front substrate and having X and Y electrodes;

A front dielectric layer filling the sustain electrode and having at least one electric field concentrator formed between the X and Y electrodes;

A rear substrate disposed in parallel with the front substrate;

An address electrode disposed on the rear substrate and formed in a direction crossing the sustain electrode;

A back dielectric layer having the address electrode embedded therein;

A partition wall disposed between the front and rear substrates to define a discharge space;

A black stripe layer disposed in the discharge space and disposed above the X and Y electrodes at predetermined intervals; And

And red, green, and blue phosphor layers coated inside the partition wall.

In addition, the X and Y electrodes are characterized in that the ITOless electrode.

In addition, the X and Y electrodes are embedded by a first front side dielectric layer, and the black stripe layer is formed on the surface of the first front side dielectric layer, and is embedded by a second front side dielectric layer.

In addition, the electric field concentrator is a groove having a predetermined depth formed by making the thickness of the front dielectric layer thinner than other portions of the front dielectric layer.

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 plasma display panel 200 according to an 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. A frit glass is applied along the edges of the inner and opposite surfaces of the front and rear substrates 210 and 220 to seal each other.

The front substrate 210 is made of a transparent substrate such as soda lime glass. A storage electrode 230 having X and Y electrodes 231 and 232 is formed on the bottom surface of the front substrate 210.

The X and Y electrodes 231 and 232 are disposed in a direction parallel to the X direction of the front substrate 210. The X and Y electrodes 231 and 232 are spaced apart from each other by a predetermined interval along the Y direction of the front substrate 210, and are alternately formed. In addition, the X and Y electrodes 231 and 232 are strip-shaped so as to face each other in a set in each discharge space.

In this case, the shape of the X and Y electrodes 231 and 232 or the shape disposed in the discharge space may be disposed in each discharge space to generate discharge from a gap between the two electrodes 231 and 232. If so, it is not limited to any one shape or arrangement.

The X and Y electrodes 231 and 232 are buried by the front dielectric layer 240. The front dielectric layer 240 is entirely coated to fill the X and Y electrodes 231 and 232 using a transparent dielectric such as PbO-B ₂ O ₃ -SiO ₂ . Alternatively, the front dielectric layer 240 may be selectively applied only to certain portions, including portions where the X and Y electrodes 231 and 232 are patterned and the like.

A passivation layer 250 made of magnesium oxide (MgO) is formed on the surface of the front dielectric layer 240 to increase secondary electron emission amount. The passivation layer 250 is coated on the entire surface of the front dielectric layer 240.

The back substrate 220 is also made of substantially the same material as the front substrate 210. An address electrode 260 is formed on an inner surface of the rear substrate 220. The address electrode 260 is formed of a plurality of strips and is disposed in parallel with the Y direction of the rear substrate 220 which is a direction crossing the X and Y electrodes 231 and 232. The address electrode 260 extends across discharge cells disposed adjacent to the Y direction, and is spaced apart from each other in a direction parallel to the X direction. The address electrode 260 is made of a metal material having excellent conductivity, such as silver paste.

The address electrode 260 is buried by the back dielectric layer 270. The back dielectric layer 270 is made of a high dielectric material substantially the same as the front dielectric layer 240.

The partition wall 280 is disposed between the front and rear substrates 210 and 220. The partition wall 280 defines a discharge space and is disposed in a grid to prevent cross talk.

That is, the partition wall 280 is formed of a first partition wall 281 arranged in a direction crossing the address electrode 260 (X direction), and a first partition wall arranged in a direction (Y direction) parallel to the address electrode 260. Two partitions 282 are included. The first partition 281 is integrally extended to the adjacent second partition 282 in a direction facing each other to define a grid-shaped discharge space.

The barrier rib 280 is not limited to the above-described embodiment, and the barrier rib 280 is not limited to any one structure as long as it can partition the discharge space into an array pattern of pixels. Polygons may exist in various embodiments.

On the other hand, red, green, and blue phosphor layers 290 are coated on the inner surface of the partition wall 280 and the inner surface of the back dielectric layer 270 for each discharge space. 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 this case, the X and Y electrodes 231 and 232 are made of ITOless electrodes, the electric field concentrator 320 to improve the discharge efficiency in the gap between the X and Y electrodes 231 and 232. Is formed, and a black stripe layer 310 is formed in the discharge space in which the X and Y electrodes 231 and 232 are disposed to improve contrast.

In more detail, 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 drawings, the discharge spaces defined by the partition walls are disposed to face each other from the inner surface of the front substrate 210. The X and Y electrodes 231 and 232 are made of a metal having excellent conductivity, such as silver paste, chromium-copper-chromium, or the like. That is, the X and Y electrodes 231 and 232 are ITOless electrodes that are not patterned with a transparent conductive film such as an ITO film.

The black stripe layer 310 is formed in the discharge space. The black stripe layer 310 extends from the inner side walls of the X and Y electrodes 231 and 232 into the discharge space. The black stripe layer 310 is formed on the same plane as the X and Y electrodes 231 and 232, and the height thereof is substantially the same as the X and Y electrodes 231 and 232.

In addition, the black stripe layer 310 has substantially the same strip shape as the X and Y electrodes 231 and 232 and extends in contact with the inner wall of the X and Y electrodes 231 and 232. The black stripe layer 310 is embedded in the front dielectric layer 240 together with the X and Y electrodes 231 and 232. The black stripe layer 310 is formed by mixing frit glass, a black pigment, and a photosensitive vehicle.

An electric field concentrator 320 is formed in the discharge space between the X and Y electrodes 231 and 232 to lower the discharge firing voltage. The electric field concentrator 320 is a groove formed so that the thickness of the front dielectric layer 240 between the X and Y electrodes 231 and 232 is thinner than other regions.

That is, the front dielectric layer 240 has a gap g ₁ between the X and Y electrodes 231 and 232 compared to the maximum thickness t ₂ that fills the X and Y electrodes 231 and 232. The thickness t ₂ of is formed relatively thin. In addition, the gap g ₁ of the electric field concentrator 320 is formed to be narrower than the gap g ₂ between the X and Y electrodes 231 and 232.

In this case, the electric field concentrator may be formed in various forms. As shown in FIG. 4, the electric field concentrator 420 is continuous like a hollow strip along the longitudinal direction in which the X and Y electrodes 231 and 232 are disposed. As shown in FIG. 5, the electric field concentrator 520 may be a discontinuous groove such as a dot type selectively formed only in the discharge space in which the X and Y electrodes 231 and 232 are disposed. have.

3, the gap thickness t ₁ between the X and Y electrodes 231 and 232 is formed to be thinner than the thickness t ₂ of other regions due to the electric field concentrator 320. The purpose is to increase the probability of actively ionizing excitation of gas atoms with a stronger electric field effect in the discharge space between the X and Y electrodes 231 and 232.

A passivation layer 250 is formed on the front surface of the front dielectric layer 240 so that ions generated in the front substrate 210 may emit secondary electrons by interacting with the surface.

In the plasma display panel 200, a discharge gas is injected into the discharge space S defined by the lattice-shaped partition wall 280. The discharge gas is neon and a high concentration of xenon (about 10% by volume). Xe).

Referring to the operation of the plasma display panel 200 according to an embodiment of the present invention having the above configuration is as follows.

First, when a predetermined address voltage is applied between the address electrode 260 and the Y electrode 232 from an external power source, the discharge cells to emit light are selected. Wall charges are accumulated on the Y electrode 232 of the selected discharge cell. At this time, the generated wall charge is charged in the electric field concentrator 320 formed in the gap between the X and Y electrodes 231 and 232.

Subsequently, when a voltage of “+” is applied to the X electrode 231 and a voltage higher than this is applied to the Y electrode 232, the wall is caused by the voltage difference applied between the X and Y electrodes 231 and 232. The charge will move. The discharge start voltage for the sustain discharge can be lowered by the electric field concentrator 320 and the electric charges charged therein.

That is, the movement of the wall charges causes a discharge while colliding with the discharge gas atoms in the discharge space, thereby generating a plasma, and the discharge generates a gap between the X electrode 231 and the Y electrode 232 where a relatively strong electric field is formed. g ₂ ) is more likely to occur.

Subsequently, if the voltage difference between the X electrode 231 and the Y electrode 232 is still sufficiently large as time passes, the electric field formed between the two electrodes 231 and 232 is gradually concentrated so that the discharge is discharged. It spreads throughout the space.

If the voltage difference between the X and Y electrodes 231 and 232 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 X and Y electrodes 231 and 232 are interchanged, the initial discharging 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 implement a still image or a moving picture.

As such, the discharge begins in the gap g ₂ between the X and Y electrodes 231 and 232, so that the plasma density is concentrated around the gap g ₂ . In addition, plasma is diffused from the gap g ₂ of the X and Y electrodes 231 and 232 to the outside of the electrodes 231 and 232 based on the high density of electrons and ions, thereby transferring the distribution of wall charges. It can be formed in an area | region.

As described above, the plasma display panel 200 has an electrode structure of a high-efficiency discharge cell by efficiently using the outer portions of the X and Y electrodes 231 and 232, and the X and Y electrodes 231 and 232. Discharge from the gap g ₂ ) to the outside of the X and Y electrodes 231 and 232 to facilitate generation of charged particles and excitation species, thereby improving efficiency.

In addition, a black stripe layer 310 is formed on the inner side walls of the X and Y electrodes 231 and 232 so that contrast can be improved by preventing other colors from emitting from adjacent discharge cells.

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

Referring to the drawing, the plasma display panel 600 includes a front substrate 610 and a rear substrate 620 disposed in parallel thereto.

On the inner surface of the front substrate 610, a set of X and Y electrodes 631 and 632 are disposed in the discharge space. The X and Y electrodes 631 and 632 are ITOless electrodes not made of a transparent conductive film such as ITO.

The X and Y electrodes 631 and 632 are embedded by the first front dielectric layer 641. The black stripe layer 710 is formed on the surface of the first dielectric layer 641 to be spaced apart from the X and Y electrodes 631 and 632 by a predetermined interval.

The black stripe layer 710 is disposed in the discharge space and is formed on the surface of the first front dielectric layer 641 corresponding to the X and Y electrodes 631 and 632. The black stripe layer 710 is substantially the same shape as the X and Y electrodes 631 and 632, but is not limited thereto. The black stripe layer 710 is buried by the second front dielectric layer 642.

The black stripe layer 710 is formed by mixing frit glass, a black pigment, and a photosensitive vehicle. Alternatively, the black stripe layer 710 may serve as a floating electrode to improve discharge efficiency. In this case, a black pigment is mixed with a conductive material such as silver paste. have.

As such, the front dielectric layer 640 includes X and Y electrodes 631 and 632 formed of ITOless electrodes, a first front dielectric layer 641 filling the front dielectric layer 641, and a black stripe formed on the surface of the first front dielectric layer 641. A second front side dielectric layer 642 embedding layer 710 is included, wherein the first and second front side dielectric layers 641 and 642 are substantially the same material.

In addition, an electric field concentrator 720 is formed in the discharge space between the X and Y electrodes 631 and 632 to lower the discharge start voltage. The electric field concentrator 720 is a groove in which the thickness of the front dielectric layer 640 between the X and Y electrodes 631 and 632 is thinner than that of other regions. The gap g ₃ of the electric field concentrator 720 is narrower than the gap g ₄ between the X and Y electrodes 631 and 632.

The electric field concentrator 720 is a hollow strip-shaped groove that is continuously thinner than other regions along the longitudinal direction in which the X and Y electrodes 631 and 632 are disposed, or the X and Y electrodes 631 and 632. It may be a discontinuous dot-shaped groove selectively formed only in the discharge space in which?) Is disposed.

On the surface of the front dielectric layer 640, a protective film layer 659 such as magnesium oxide is coated on the entire surface in order to increase secondary electron emission amount.

An address electrode 660 is formed in the back substrate 620 in a direction crossing the X and Y electrodes 631 and 632, and the address electrode 660 is embedded by the back dielectric layer 670.

A partition wall 680 is formed between the front and back substrates 610 and 620 to define a discharge space, and inside the partition wall 680, red, green, and blue phosphor layers 690 for each discharge space. ) Is applied.

On the other hand, the discharge gas into which the discharge gas is injected into the discharge space S partitioned by the partition wall 680 includes neon Ne and a high concentration of xenon Xe of about 10% by volume.

Hereinafter, the discharge characteristics of the field concentrator according to the present applicant's experiment will be described as shown in Table 1 below.

Example Comparative example Initial discharge voltage 150 V 230 V Contrast 4000: 1 2500: 1 Discharge efficiency 2.4 lm / W 1.0 lm / W

Here, the embodiment is a plasma display panel according to an embodiment of the present invention, in which an electric field concentrator is formed between X and Y electrodes made of ITOless electrodes, and black stripes are formed in the discharge space. Further, the spacing of the electric field concentrators is 70 micrometers, and the gap between the X and Y electrodes is 100 micrometers. The comparative example is a conventional plasma display panel in which an electric field concentrator is not formed between the X and Y electrodes, and a black stripe layer is formed in the non-discharge space.

Referring to Table 1, the discharge initial voltage is 150V in the case of the embodiment, it is 230V in the comparative example, it is possible to lower the discharge initial voltage by about 80V. Comparing the contrast, the contrast is 4000: 1 in the case of the embodiment, 2500: 1 in the case of the comparative example, it can be seen that the contrast is improved. In addition, when comparing the discharge efficiency, in the case of the example is 2.4 lm / W, the comparative example is 1.0 lm / W, it can be seen that the discharge efficiency is improved by about 1.4 lm / W.

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

First, as the black stripe layer is formed in the discharge space, the contrast of the panel can be improved.

Second, by disposing the X and Y electrodes made of ITOless electrodes, the manufacturing process is simplified and the manufacturing cost is reduced.

Third, the electric field concentrator is formed in the gap between the X and Y electrodes, so that the discharge start voltage can be lowered. As a result, power consumption can be reduced.

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 cell of a conventional plasma display panel;

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

3 is a cross-sectional view illustrating a unit discharge cell of FIG. 2;

4 is a perspective view showing an electric field concentration unit according to the first embodiment of the present invention;

5 is a perspective view showing an electric field concentration unit according to a second embodiment of the present invention;

6 is a sectional view showing a unit discharge cell according to another 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 ... hold electrode 231 ... X electrode

232 ... Y electrode 240 ... Front dielectric layer

250 protective layer 260 address electrode

270 back dielectric layer 280 bulkhead

290 phosphor layer 310 black stripe layer

320.Electric Field Concentrator

Claims (14)

Front substrate; Sustain electrodes alternately disposed on the front substrate and having X and Y electrodes; A front dielectric layer filling the sustain electrode and having at least one electric field concentrator formed between the X and Y electrodes; A rear substrate disposed in parallel with the front substrate; An address electrode disposed on the rear substrate and formed in a direction crossing the sustain electrode; A back dielectric layer having the address electrode embedded therein; A partition wall disposed between the front and rear substrates to define a discharge space; A black stripe layer disposed in the discharge space and formed on an inner side of the X and Y electrodes facing each other; And And a red, green, and blue phosphor layer coated inside the partition wall. The method of claim 1, And the X and Y electrodes are ITOless electrodes. The method of claim 1, And the black stripe layer extends from inner walls of the X and Y electrodes. The method of claim 1, And the electric field concentrator is a groove having a predetermined depth formed by making the thickness of the front dielectric layer thinner than other portions of the front dielectric layer. The method of claim 4, wherein And said groove is formed discontinuously between X and Y electrodes in each discharge space. The method of claim 4, wherein And the groove is continuously formed in the discharge space along one direction of the X and Y electrodes. The method of claim 1 And a passivation layer is further formed on the surface of the front dielectric layer to increase secondary electron emission. Front substrate; Sustain electrodes alternately disposed on the front substrate and having X and Y electrodes; A front dielectric layer filling the sustain electrode and having at least one electric field concentrator formed between the X and Y electrodes; A rear substrate disposed in parallel with the front substrate; An address electrode disposed on the rear substrate and formed in a direction crossing the sustain electrode; A back dielectric layer having the address electrode embedded therein; A partition wall disposed between the front and rear substrates to define a discharge space; A black stripe layer disposed in the discharge space and disposed above the X and Y electrodes at predetermined intervals; And And a red, green, and blue phosphor layer coated inside the partition wall. The method of claim 8, And the X and Y electrodes are ITOless electrodes. The method of claim 8, Wherein the X and Y electrodes are buried by a first front dielectric layer, and the black stripe layer is formed on a surface of the first front dielectric layer, and is embedded by a second front dielectric layer. The method of claim 8, And the electric field concentrator is a groove having a predetermined depth formed by making the thickness of the front dielectric layer thinner than other portions of the front dielectric layer. The method of claim 11, And said groove is disposed in each discharge space and is formed discontinuously between X and Y electrodes. The method of claim 11, And the groove is continuously formed in the discharge space along one direction in which the X and Y electrodes are disposed. The method of claim 8 And a passivation layer is further formed on the surface of the front dielectric layer to increase secondary electron emission.