KR20050114069A - Plasma display panel - Google Patents

Abstract

A plasma display panel is disclosed. The present invention provides a semiconductor device comprising: a front substrate; a sustain electrode having X and Y electrodes formed on an inner surface thereof, and a bus electrode electrically connected thereto; and at least one electric field embedded between the sustain electrodes and embedded between the X and Y electrodes. A front dielectric layer formed with a concentrator; a back substrate disposed in parallel with the front substrate; an address electrode formed on an inner surface thereof; and a back dielectric layer embedded therein; and a plurality of substrates to define a discharge space. A partition; and a black stripe layer disposed in the discharge space; and a red, green, and blue phosphor layer applied to the inside of the partition; forming a region in which an electric field is concentrated in the discharge space of the panel, thereby starting discharge. The voltage can be reduced, and the contrast of the panel can be improved by forming the black stripe layer in the discharge space.

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 concentrator is formed in a gap between discharge electrodes, and a black stripe is inserted into a discharge space to improve discharge efficiency.

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.

1 illustrates a conventional plasma display panel 100.

Referring to the drawings, the conventional 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 passivation 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 the The partition wall 180 provided on the rear dielectric layer 170 and the red, green, and blue phosphor layers 190 coated on the inner surface of the partition wall 180 and the surface of the rear dielectric layer 170 are sequentially formed. .

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.

Applying the address voltage between the Y electrode 132 and the address electrode 160 to select a discharge cell for light emission, and applying a sustain discharge voltage between the X and Y electrodes 131 and 132, Surface discharge occurs in the discharge region on the surface of the passivation layer 150, and ultraviolet rays are generated. As the fluorescent material of the phosphor layer 190 is excited by the generated ultraviolet rays, a still image or a moving image is realized.

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

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.

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 concentration unit is formed in a gap between discharge 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;

A sustain electrode having X and Y electrodes alternately formed on an inner surface of the front substrate, and a bus electrode electrically connected to the 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 disposed 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 defined by the partition wall; And

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

In addition, the black stripe layer is formed in contact with one surface of the X and Y electrodes.

In addition, the black stripe layer is formed on the same plane as the bus electrode formed along each edge of the X and Y electrodes.

Furthermore, the black stripe layer is disposed on the X and Y electrodes so as to be spaced apart from the predetermined interval.

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

In addition, the width of the X or Y electrode is characterized in that less than twice the width of the bus electrode.

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

In addition, the distance between the electric field concentrator is characterized in that the narrower than the gap between the X and Y electrodes.

The electric field concentrator may be a groove having a predetermined depth.

In addition, the discharge gas is characterized in that it comprises 10% by volume or more of Xe gas.

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 surfaces of the front and rear substrates 210 and 220 that face each other to seal each other.

The front substrate 210 is made of a transparent substrate such as soda lime glass. The storage electrode 230 is formed on the bottom surface of the front substrate 210. The sustain electrode 230 includes X and Y electrodes 231 and 232, and a bus electrode 233 electrically connected to the X and Y electrodes 231 and 232.

The X and Y electrodes 231 and 231 are arranged in a direction parallel to the X direction of the front substrate 210, and are alternately disposed at predetermined intervals. In addition, the X and Y electrodes 231 and 232 are positioned one set in each discharge space, and have a concave-convex shape protruding to a predetermined size in a direction opposite to the inner wall of each strip. The X and Y electrodes 231 and 232 are made of a transparent conductive film, for example, an ITO film.

At the edges of the X and Y electrodes 231 and 232, strip bus electrodes 233 are formed to reduce the line resistance of the X and Y electrodes 231 and 232. The bus electrode 233 is made of a metal material having excellent conductivity, such as silver paste.

The shapes of the X and Y electrodes 231 and 232 and the bus electrode 233 and the shapes arranged in the discharge space are not only the above-described examples, but any shape as long as the structures are arranged to correspond to each other in the discharge space. However, it is not limited to the arranged form.

The sustain electrode 230 is buried by the front dielectric layer 240. The front dielectric layer 240 is entirely coated to fill the sustain electrode 230 using a transparent dielectric such as PbO-B ₂ O ₃ -SiO ₂ . Alternatively, the sustain electrode 230 may be selectively applied only to a specific portion including a patterned portion 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. 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 orthogonal to the sustain electrode 230. The address electrode 260 extends across each unit discharge cell, and is made of a metal material having excellent conductivity, for example, 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.

A partition wall 280 is formed 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 barrier rib 280 is formed of a first barrier rib 281 disposed in a direction crossing the address electrode 260 in the direction (X direction), and a barrier rib 280 disposed 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⁺ .

Here, a black stripe layer 310 is formed in the discharge space in which the X and Y electrodes 231 and 232 are disposed, and a gap between the X and Y electrodes 231 and 232 is formed. In the gap), the electric field concentrator 320 is formed to improve the discharge efficiency.

It will be described in more detail and as shown in FIG. 3.

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

Referring to the drawings, the X and Y electrodes 231 and 232 are disposed to face each other from the inner surface of the front substrate 21 in the discharge space defined by the partition wall 280. One side edge of the X and Y electrodes 231 and 232 may be a transparent conductive film, for example, a bus electrode made of a metal having excellent conductivity to reduce the line resistance of the X and Y electrodes 231 and 232 made of an ITO film. 233 is electrically connected.

In this case, a black stripe layer 310 is formed in the discharge space. The black stripe layer 310 is formed on the same plane as the bus electrode 233 from one surface of the X and Y electrodes 231 and 232. In addition, the black stripe layer 310 is formed to have a predetermined width from one side wall of the bus electrode 233.

The black stripe layer 310 is substantially the same strip shape as the bus electrode 233 and is formed in contact with one surface of the X and Y electrodes 231 and 232 in a shape corresponding thereto. The black stripe layer 310 is embedded in the front dielectric layer 240 together with the bus electrode 233.

The black stripe layer 310 is patterned by mixing frit glass, a black pigment, and a photosensitive vehicle.

In addition, 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 between the X and Y electrodes 232 and 232 compared to the total thickness t _{2 in} the vertical direction in which the X and Y electrodes 231 and 232 are embedded. The thickness t ₁ at the part is relatively thin. In addition, the interval 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 may be a groove continuously formed along the length direction in which the X and Y electrodes 231 and 232 are disposed. In addition, as shown in FIG. 5, the electric field concentrator 520 may be a discontinuous groove selectively formed only in the discharge space in which the X and Y electrodes 231 and 232 are disposed.

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

At this time, in connection with the formation of the electric field concentrator 320, the width w ₂ of the X or Y electrodes 231 and 232 should have a dimension smaller than twice the width w ₁ of the bus electrode 233. do. That is, the condition of (w ₂ ) <2 × (w ₁ ) must be satisfied. If the above range is exceeded, the distance between the X and Y electrodes 231 and 232 becomes narrow, and there is a fear of dielectric breakdown due to the formation of the electric field concentrator 32.

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

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

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. Bus electrodes 633 electrically connected thereto are formed at edges of the X and Y electrodes 631 and 632.

The X and Y electrodes 631 and 632 and the bus electrode 633 are buried by the first front dielectric layer 641. The black stripe layer 710 is formed on the surface of the first front dielectric layer 641 to be spaced apart from the X and Y electrodes 631 and 632 by a predetermined distance.

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 bus electrode 633, but is not limited thereto. The black stripe layer 710 is buried by the second front dielectric layer 642.

As such, the front dielectric layer 640 includes a first front dielectric layer 641 filling the X and Y electrodes 631 and 632, a bus electrode 633 electrically connected thereto, and the first front dielectric layer 641. A second front side dielectric layer 642 is embedded in the black stripe layer 710 formed on the surface of the substrate.

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

The electric field concentrator 720 is a groove continuously formed along the longitudinal direction in which the X and Y electrodes 631 and 632 are disposed, or selectively in the discharge space in which the X and Y electrodes 631 and 632 are disposed. It may be a discontinuous groove formed.

The gap g ₃ of the electric field concentrator 720 is smaller than the gap g ₄ between the X and Y electrodes 631 and 632. The width of the X or Y electrodes 631 and 632 has a dimension smaller than twice the width of the bus electrode 633.

On the surface of the front dielectric layer 640, a protective film layer 650 such as magnesium oxide is coated on the entire surface 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 67.

A partition wall 680 is formed between the front and rear substrates 610 and 620 to define a discharge space, and a red, green, and blue phosphor layer 690 for each discharge space is formed inside the partition 68. ) Is applied.

On the other hand, the plasma display panel 600 is discharged into the discharge space (S) partitioned by the grid partition 680, the discharge gas is neon (Ne) and high concentration xenon of about 10% by volume (Xe).

The operation of the plasma display panel 200 according to an embodiment of the present invention having the above configuration will be described below with reference to FIG. 3.

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 is a gap g ₂ between the X electrode 231 and the Y electrode 232 in which a relatively strong electric field is formed. ) 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 realize an image.

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 in which the electric field concentrator 320 is formed 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. Discharges from the gap between the Y electrodes 231 and 232 to the outside of the X and Y electrodes 231 and 232 to favor the generation of charged particles and excitation species, thereby improving efficiency. Structure. In addition, since the black stripe layer 310 is formed in the discharge space, it is possible to prevent other colors from emitting from adjacent discharge cells.

The discharge characteristics according to the spacing g ₁ of the electric field concentrator according to the present applicant's experiment, the gap g ₂ between the X and Y electrodes 231 and 232, and the presence or absence of the black stripe layer 310 are formed. As shown in 1.

Example Comparative example Initial discharge voltage 145 V 225 V Contrast 4000: 1 3000: 1 Discharge efficiency 2.6 lm / W 1.1 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 in a gap between X and Y electrodes, and a black stripe layer is formed in a discharge space. Further, the spacing of the electric field concentrators is 70 micrometers, and the gap between the X and Y electrodes is 110 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 initial discharge voltage of the Example was 145 V, whereas the initial discharge voltage of the Example was 225 V, and the initial discharge voltage of the Example was about 80 V lower than the initial discharge voltage of the Comparative Example. In contrast, the contrast was 4000: 1 in the case of the example, and 3000: 1 in the case of the comparative example, and the contrast was improved in the case of the example. On the other hand, the discharge efficiency of the embodiment is 2.6 lm / W, while the discharge efficiency of the comparative example is 1.1 lm / W, it can be seen that the case of the embodiment is improved about 1.5 lm / W.

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

First, by forming a region where an electric field is concentrated in the discharge space of the panel, the discharge start voltage can be lowered. As a result, power consumption can be reduced.

Second, by forming the black stripe layer in the discharge space, the contrast of the panel can be improved.

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 233 ... bus electrode

240.Front dielectric layer 250.Protective layer

260 ... address electrode 270 ... backside dielectric layer

280 bulkhead 290 phosphor layer

310 ... Black stripe layer 320 ... Electric field concentration

Claims (16)

Front substrate; A sustain electrode having X and Y electrodes alternately formed on an inner surface of the front substrate, and a bus electrode electrically connected to the 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 disposed 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 defined by the partition wall; And And a red, green, and blue phosphor layer coated inside the partition wall. The method of claim 1, And the black stripe layer is formed in contact with one surface of the X and Y electrodes. The method of claim 2, And the black stripe layer is formed on the same plane as a bus electrode formed along each edge of the X and Y electrodes. The method of claim 3, wherein And the black stripe layer is buried by a front dielectric layer. The method of claim 1, And the black stripe layer is disposed on the X and Y electrodes so as to be spaced apart from each other by a predetermined distance. The method of claim 5, And the X and Y electrodes and the bus electrode are embedded by a first front dielectric layer, and a 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 6, And the black stripe layer is disposed at a position corresponding to the X and Y electrodes. The method of claim 1, And the width of the X or Y electrode is narrower than twice the width of the bus electrode. The method of claim 1, And the electric field concentrator is formed by making the thickness of the front dielectric layer thinner than other portions of the front dielectric layer. The method of claim 9, Wherein the distance between the electric field concentrators is smaller than the gap between the X and Y electrodes. The method of claim 9, And the electric field concentrator is a groove having a predetermined depth. The method of claim 11, And the groove is formed discontinuously between the X and Y electrodes. The method of claim 12, Discontinuously formed grooves are disposed in the discharge space defined by the partition wall. The method of claim 11, And the groove is continuously formed between the X and Y electrodes. The method of claim 1, And the discharge gas comprises 10% by volume or more of Xe gas. 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.