KR100615334B1 - Plasma display panel - Google Patents

Abstract

It is an object of the present invention to improve the transmittance of visible light, to use a material other than ITO as a material for electrode formation, to form a discharge three-dimensionally throughout the discharge cell, and to sufficiently space the distance between the electrodes causing the discharge. The present invention provides a plasma display panel which can increase the life of the phosphor by preventing the driving voltage from increasing and increasing the discharge voltage even at a low voltage while preventing the ion sputtering of the phosphor. To this end, in the present invention, the front substrate; A rear substrate disposed to face the front substrate; A dielectric layer disposed between the front substrate and the rear substrate and defining discharge cells which are spaces in which discharge occurs; An electrode pair having an X electrode, a Y electrode, and an address electrode arranged to be spaced apart from each other in the dielectric layer; A phosphor layer disposed in the discharge cell; And a discharge gas present in the discharge cell, the discharge gas present in the discharge cell, and the dielectric material surrounding the address electrode is smaller in dielectric constant than the dielectric material surrounding the other electrode. A plasma display panel is provided, and a cross-sectional area of the address electrode is smaller than that of the X and Y electrodes.

Description

 Plasma display panel {Plasma display panel}

1 is a partially cutaway perspective view of a conventional plasma display panel.

2 is a partially cutaway perspective view illustrating a plasma display panel according to the present invention;

3 is a perspective view illustrating an arrangement of electrodes of the plasma display panel illustrated in FIG. 2.

FIG. 4 is a block diagram schematically illustrating a configuration of a plasma display device including the plasma display panel shown in FIG. 2.

FIG. 5 is a cross-sectional view taken along line V-V in a state in which the plasma display panel shown in FIG. 2 is coupled, showing a configuration of a discharge cell and discharge electrodes around the discharge cell;

FIG. 6 is a view showing another embodiment in which the dielectric layer differs from the embodiment shown in FIG. 5; FIG.

7 and 8 are views showing another embodiment in which the position of the phosphor layer is different from the embodiment shown in FIG.

<Description of Symbols for Main Parts of Drawings>

10, 121: back substrate 20, 122: address electrode

30: rear dielectric layer 40: partition wall

50r, 50g, 50b, 125: phosphor layer 60, 111: front substrate

80: front dielectric layer 82: X electrode

83: Y electrode 84: sustain discharge electrode pair

90: protective film 112: Y electrode

113: X electrode 115: dielectric layer

116: protective film layer 126: discharge cell

200: plasma display panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel. More particularly, the present invention relates to a plasma display panel capable of driving a low voltage while inducing a three-dimensional discharge and increasing a discharge amount, and dramatically improving luminance by increasing a transmittance of visible light.

1 is a partially exploded perspective view of a conventional plasma display panel disclosed in Japanese Patent Laid-Open No. 1997-172442.

As shown in FIG. 1, in the conventional plasma display panel, the front panel 1 and the rear panel 2 are coupled, and discharge gas is filled in a space defined by the front panel 1 and the rear panel 2. Is made. The front panel 1 includes a front discharge substrate 60, a pair of sustain discharge electrodes 84 having a Y electrode 83 and an X electrode 82 formed on the bottom surface 60a of the front substrate 60, and And a front side dielectric layer 80 covering the sustain discharge electrode pair 84. The front dielectric layer 80 is preferably covered by a protective layer 90 formed of MgO. On the other hand, the Y electrode 83 is provided with a first transparent electrode 83b formed of ITO or the like and a first bus electrode 83a for preventing a voltage drop of the first transparent electrode 83b. Similarly to the Y electrode 83, the 82 has a second transparent electrode 82b and a second bus electrode 82a.

The rear panel 2 covers the back substrate 10, the address electrodes 20 formed on the top surface of the back substrate 10 to intersect the pair of sustain discharge electrodes 84, and the address electrodes 20. A rear dielectric layer 30, a barrier rib 40 formed on the rear dielectric layer 30 to define a discharge cell together with the sustain discharge electrode pair 84, and a phosphor coated on an inner surface of the discharge cell. Layers 50r, 50g, 50b.

In the conventional plasma display panel having such a structure, a discharge cell to emit light is selected by an address discharge between the address electrode 20 and the Y electrode 83, and the X electrode 82 and the Y electrode of the selected discharge cell are selected. The discharge cell emits light due to the sustain discharge occurring between (83). More specifically, the sustain discharge causes the discharge gas in the discharge cell to emit ultraviolet rays, which cause the phosphor layers 50r, 50g, and 50b to emit visible light. Light emitted from the phosphor layers 50r, 50g, and 50b implements an image of the plasma display panel.

There are various conditions for improving the luminous efficiency of the plasma display panel. Important among these conditions are that the volume of the space in which the sustain discharge to excite the discharge gas takes place must be large, and there must be few components that prevent the visible light emitted from the phosphor layer from traveling forward of the plasma display panel. And so on.

However, in the case of the plasma display panel having the above structure, since the sustain discharge occurs only in the space between the X electrode 82 and the Y electrode 83 adjacent to the protective film 90, the volume of the space where the sustain discharge occurs is small. And a portion of the visible light emitted from the phosphor layers 50r, 50g, 50b is absorbed and / or absorbed by the protective film 90, the upper dielectric layer 80, the transparent electrodes 82b, 83b, the bus electrodes 82a, 83a, and the like. There is a drawback to reflection. That is, the amount of visible light passing through the front substrate 60 is only about 60% of the amount of visible light emitted from the phosphor layers 50r, 50g, and 50b.

In addition, in the AC type three-electrode surface discharge plasma display panel, since the electrode pairs that cause discharge are disposed on the back surface of the front substrate, most of the electrode pairs have high resistance, high cost, and are difficult to handle in order to pass visible light. It should be formed as an ITO electrode. Therefore, a voltage drop occurs at the ITO electrode, which may make the image of the large-screen plasma display panel nonuniform, resulting in an increase in manufacturing cost.

In addition, in such an AC-type three-electrode surface discharge plasma display panel, the discharge is concentrated only on the back surface of the front substrate on which the electrode pairs are arranged. As a result, the inefficiency of the discharge is increased because the space of the discharge cell cannot be effectively utilized.

In addition, due to the price limit of the integrated circuit chip, which accounts for a large part of the manufacturing cost of the plasma display panel, there was a limit to increase the amount of discharge by limiting the spaced distance between the electrode pairs to a certain distance, thereby resulting in the limitation of luminance improvement. .

In addition, when such an AC type three-electrode surface discharge plasma display panel is used for a long time, charged particles of the discharge gas are diffused backward from the rear surface of the front substrate by the electric field and accelerated, thereby causing ion sputtering in the phosphor. This increases and there is a problem causing permanent afterimage on the screen.

The present invention aims to solve the following problems, including the above problems.

First, it is aimed to drastically improve the transmittance of visible light by minimizing components disposed on a light path through which visible light travels.

Second, an object other than ITO can be used as a material for forming an electrode to reduce the manufacturing cost of the electrode and to facilitate the large area of the plasma display panel.

Third, an object of the present invention is to provide a structure in which the discharge is formed in three dimensions in the entire discharge cell and prevents the driving voltage from increasing while sufficiently increasing the spaced distance between the electrode pairs, thereby generating many discharges even at a low voltage.

Fourth, an object of the present invention is to prevent ion sputtering of a phosphor and to increase the lifetime of the phosphor.

Fifth, it is aimed at reducing power consumption and reducing heat generated during operation.

An object of the present invention as described above, the front substrate; A rear substrate disposed to face the front substrate; A dielectric layer disposed between the front substrate and the rear substrate and defining discharge cells which are spaces in which discharge occurs; An electrode pair having an X electrode, a Y electrode, and an address electrode arranged to be spaced apart from each other in the dielectric layer; A phosphor layer disposed in the discharge cell; And a discharge gas present in the discharge cell, the discharge gas present in the discharge cell, and the dielectric material surrounding the address electrode is smaller in dielectric constant than the dielectric material surrounding the other electrode. By providing a plasma display panel.

In addition, the object of the present invention as described above, the front substrate; A rear substrate disposed to face the front substrate; A dielectric layer disposed between the front substrate and the rear substrate and defining discharge cells which are spaces in which discharge occurs; An electrode pair having an X electrode, a Y electrode, and an address electrode arranged to be spaced apart from each other in the dielectric layer; A phosphor layer disposed in the discharge cell; And a discharge gas existing in the discharge cell, including a discharge gas present in the discharge cell, and having a smaller cross-sectional area of the address electrode than the X electrode and the Y electrode. Is achieved.

Here, the electrodes are preferably arranged in the order of the X electrode, the address electrode and the Y electrode from the front.

Here, the dielectric layer preferably defines the discharge cells such that the cross section of the discharge cell is a closed surface. In addition, the X electrode, the Y electrode and the address electrode may be disposed to surround the discharge cell.

Herein, the X electrode, the Y electrode and the address electrode respectively extend in a ladder shape, the X electrode and the Y electrode extend in the same direction, and the address electrode extends in the direction orthogonal to the X electrode and the Y electrode. desirable.

Here, it is preferable to further include a protective film disposed to cover at least a portion of the dielectric layer.

The phosphor layer may be disposed in a groove formed in the front substrate, in a groove formed in the rear substrate, or in both sides of the groove formed in the front substrate and the rear substrate.

Hereinafter, a plasma display panel according to the present invention will be described with reference to the drawings.

FIG. 2 is a partially cutaway perspective view of the plasma display panel according to the first embodiment of the present invention, and FIG. 3 is a perspective view showing the arrangement of the discharge electrodes of the plasma display panel shown in FIG. 2.

As shown in FIG. 2, the plasma display panel 200 according to the present invention includes a front substrate 120, a dielectric layer 115, and a back substrate 121.

The front substrate 120 is preferably made of a transparent material, and is disposed in parallel with the rear substrate 121. A predetermined groove is formed in the front substrate 120, and a phosphor layer 125 is formed in the groove. As will be described later, the position of the phosphor layer 125 is not limited to the front substrate 120.

The back substrate 121 is made of substantially the same material as the front substrate 120.

The dielectric layer 115 is disposed between the front substrate 120 and the rear substrate 121 to define a discharge cell 126 with them. The discharge cell 126 refers to a space in which discharge occurs. The dielectric layer 115 is disposed in the x-axis and y-axis directions to define a grid-shaped discharge cell 126.

In addition, the dielectric layer 115 may have various shapes such as a meander type, a delta type, a hexagon, or a honeycomb. The discharge cell 126 defined by the dielectric layer 115 may be any structure as long as it is capable of defining the discharge cells 126 such as other polygons, circles, or the like in addition to the quadrangle.

The X electrode 113, the Y electrode 112, and the address electrode 122 are buried in the dielectric layer 115. The X electrode 113, the Y electrode 112, and the address electrode 122 are disposed along the circumference of the discharge cell 126. In addition, since the X electrode 113, the Y electrode 112 and the address electrode 122 are electrically insulated from each other, different voltages can be applied.

2, the dielectric layer 115 includes a dielectric layer 115a surrounding the address electrode 122 and a dielectric layer 115b surrounding the X electrode 113 and the Y electrode, respectively. This is formed differently. The effect of using a dielectric having a different dielectric constant in combination will be described later in detail, and the description thereof is omitted here.

Magnesium oxide (MgO) and magnesium oxide (MgO) are formed on the surface of the dielectric layer 115 along the four sides of the discharge cell 126 so that ions generated in the front substrate 120 may emit secondary electrons by interacting with the surface. A protective film layer 116 made of the same material is formed. The passivation layer 116 may be applied to each discharge cell, or may cover up to the rear of the dielectric layer 115 as shown.

Meanwhile, in the discharge cell 126 defined by the front substrate 120 and the rear substrate 121 and the dielectric layer 115, neon (Ne) -xenon (Xe), helium (He) -xenon (Xe), and the like. The same discharge gas is injected.

As shown in FIG. 3, the X electrode 113 and the Y electrode 112 are arranged to cause opposite discharge in the discharge cell 126, and the Y electrode 112 and the address electrode 122 are disposed up and down. It is arranged.

The X electrode 113 and the Y electrode 112 are formed in a ladder shape and are disposed in one direction while surrounding the discharge cell 126. The X electrode 113 and the Y electrode 112 are disposed in parallel to each other. The address electrode 122 is disposed in a direction orthogonal to the X electrode 113 and the Y electrode 112. Due to the arrangement of the address electrodes 122, a discharge cell 126 is present at a point where one of the X electrodes 113 and the Y electrodes 112 and the address electrode 122 cross each other. By appropriately selecting one of the X electrode 113 and the Y electrode 112 and the address electrode 122, it becomes possible to select the discharge cell 126 in which the discharge will occur. On the other hand, when an address discharge occurs in which the discharge cells 126 to generate sustain discharge occur between the Y electrode 112 and the address electrode 122, the Y electrode 112 becomes a scan electrode and the X electrode 113. ) Becomes the sustain electrode.

Meanwhile, although the shapes of the X electrode 113, the Y electrode 112, and the address electrode 122 all have a ladder shape, the shapes of the electrodes are not limited thereto in the plasma display panel according to the present invention. In the form of an electrode that can be disposed in a manner surrounding the discharge cell, an electrode shape having a structure in which several annular rings are connected in succession is also included in the scope of the present invention.

Hereinafter, each component of the plasma display panel according to the present invention having the above configuration and its operation will be described in more detail.

The front substrate 120 is transparent and may be formed of a material having a predetermined strength, for example, soda glass or transparent plastic.

Since the X electrode 113, the Y electrode 112, and the address electrode 122 are disposed in the dielectric layer 115, the X electrode 113, the Y electrode 112, and the address electrode 122 are not positioned on the optical path that is a path through which visible light travels. Therefore, there is no need to consider transmission of visible light. Therefore, the X electrode 113, the Y electrode 112, and the address electrode 122 need not be formed of a transparent ITO electrode, but may be formed of Ag, Cu, Cr, or the like having good electrical conductivity. Therefore, screen unevenness and an increase in manufacturing cost due to the ITO electrode can be prevented.

In addition, since the X electrode 113, the Y electrode 112, and the address electrode 122 are disposed in the dielectric layer 115 unlike the conventional AC plasma display panel, the X electrode 113, the Y electrode 112, and the address electrode 122 do not exist on the optical path that is a visible path of the visible light. Therefore, the visible light is not blocked due to the presence of the electrode, thereby increasing the luminance.

The dielectric layer 115 may be formed of a glass component including an element such as Pb, B, Si, Al, and O. If necessary, ZrO ₂ , TiO ₂ , and Al ₂ O ₃ may be used. It may be formed of a dielectric including fillers and pigments such as Cr, Cu, Co, Fe, TiO _2, and the like.

When the dielectric layer 115 is applied with a pulse voltage to the electrodes disposed therein, the dielectric layer 115 induces charged particles to induce wall charges participating in the discharge, thereby enabling driving through the memory effect, and the electrodes accelerate upon discharge. It protects from damage caused by collision of charged particles.

On the other hand, the shape of the discharge cell 126 defined by the dielectric layer 115 is shown as a rectangular cross-section of the smooth curved surface, the shape of the discharge cell 126 is not limited, polygon, circle, Various shapes such as honeycomb shapes can be modified.

In addition, the cross section of the discharge cell 126 is not closed, but may be limited to a stripe shape. However, when the cross section of the discharge cell 126 is in a closed shape, the electrodes may be disposed in the dielectric layer 115 to surround the discharge cell 126, thereby causing a three-dimensional discharge to increase the discharge amount. This is more preferable.

The protective layer 116 may be disposed by a deposition method using MgO or the like, and is not disposed on the optical path through which visible light passes, and thus has excellent secondary electron emission characteristics and strong carbon nanotubes (CNT). The protective film 116 may be formed of a material such as the like.

The back substrate 121 may be formed of soda glass or the like as the front substrate 120. However, since the back substrate 121 is not a component located on an optical path through which visible light generated in the discharge cell 126 travels, the rear substrate 121 does not necessarily need to be formed of transparent glass. It can also be formed of other materials such as plastic or metal for weight reduction.

The phosphor layers 125 may be divided into red, green, and blue light emitting phosphor layers so that the plasma display panel may realize a color image. The red, green, and blue light emitting phosphor layers may be divided into By disposing and combining inside the discharge cells 126, a unit pixel for implementing a color image may be formed.

The phosphor layers 125 dispose a phosphor paste in which any one of a phosphor, a solvent, and a binder are mixed in a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor in a groove formed in the front substrate 120, and then the paste is dried. And by firing.

Examples of the red light emitting phosphor may include (Y, Gd) BO ₃ : Eu ³⁺ , and examples of the green light emitting phosphor may include Zn ₂ Si0 ₄ : Mn ²⁺ . BaMgAl ₁₀ O ₁₇ : Eu ²⁺ may be used.

Meanwhile, the discharge cells 126 in which the red, green, and blue light emitting phosphor layers 125 are arranged may be adjacent to each other in one direction to form a unit pixel that is a basic unit for implementing an image. However, the arrangement of the discharge cells 126 of the present invention is not limited to being disposed in one direction as described above in order to implement a color image, and in some cases, the width of the discharge cells 126 may vary depending on the efficiency of the phosphor. The length may be different, and the arrangement may vary, such as lattice, delta, or the like.

The discharge gas existing in the discharge cell 126 may be formed of any one of neon (Ne), helium (He), or argon (Ar) including xenon (Xe) gas, or a mixed gas of two or more thereof. In this case, since the discharge gas is generally charged at a pressure lower than atmospheric pressure, the front substrate 120 and the back substrate 121 are pressed by vacuum pressure, but the dielectric layer 115 may be applied to the front substrate ( 120 and back substrate 121 are supported.

4 is a block diagram showing the configuration of a plasma display device employing the plasma display panel shown in FIG.

As shown in FIG. 4, the plasma display apparatus including the plasma display panel according to the present invention includes a plasma display panel 200, an image processor 310, a logic controller 330, an address driver 322, and a Y. FIG. The electrode driver 312 and the X electrode driver 313 are included. In the plasma display device having such a configuration, an electric signal may be applied to each of the electrodes of the plasma display panel to display.

The image processor 310 processes an external image signal to generate an internal image signal including red (R), green (G), and blue (B) digital image data, a clock signal, and vertical and horizontal synchronization signals. .

The logic controller 330 generates drive-control signals S _A , S _Y , and S _X according to an internal image signal from the image processor 310. The address electrode driver 322 processes the address signals S _A from the logic controller 330 to generate electrical signals in the form of a potential, and applies the electrical signals to the address electrodes 122.

The X electrode driver 313 operates from the logic controller 330 according to the X drive-control signal S _X to drive the X electrodes 113. In addition, the Y electrode driver 312 operates the Y electrode-control signal S _Y from the logic controller 330 to drive the Y electrodes 112.

The ends of each of the X electrodes 112 are electrically common to each other, and thus an electrical signal applied to each of the X electrodes in response to an externally applied image signal, more specifically, the potential of the potential from the X electrode driver 313. It is preferable that the electrical signals applied in the form are common to each other.

When the ends of each of the X electrodes 113 are common, the ends of each of the Y electrodes 112 are electrically separated from each other, and applied to each of the Y electrodes in response to an image signal applied from the outside. It is preferable that the electrical signals, more specifically, the electrical signals applied in the form of electric potential from the Y electrode driver 312 are separated from each other. However, since two Y electrodes disposed adjacent to the same discharge cell are applied with the same signal, ends may be connected to each other.

FIG. 5 is a cross-sectional view of the discharge cells taken along the V-V line with the plasma display panel shown in FIG. 2 coupled. Hereinafter, the function of each electrode will be described in detail with reference to FIG. 5.

The driving method for driving the plasma display panel 200 according to the first embodiment of the present invention may be various driving methods such as ADS driving, ALIS driving, AWD driving, and the like. The driving method does not change the essential features of the present invention. However, an example of driving the plasma display panel 200 according to the first embodiment of the present invention will be described below with reference to the ADS driving method. Let's do it.

In general, a discharge occurs in each of the discharge cells 126 included in the plasma display panel for displaying an image for realizing an image. As a result, the state of the wall charges or the amount of charged particles are different between the discharge cells 126, and, therefore, the discharge cells 126 when the discharges occurring in the discharge cells 126 are to be controlled in a uniform manner. It is often difficult to achieve the desired control between them.

In order to prevent such a difficulty of the discharge control, a wall that has already existed in the discharge cell 126 by applying a high voltage of a predetermined level or more to all of the discharge cells 126 to simultaneously generate discharge in all of the discharge cells 126. The charge is removed and uniformized, leading to the same state of the charged particles in the discharge cell 126. This is called a reset discharge.

This reset discharge generally applies a high potential lamp potential to all Y electrodes 112, a ground potential to all address electrodes 122, and a bias potential to the X electrodes 113 for a predetermined time. Is applied to discharge all of the discharge cells 126.

Then, after the above-described reset discharge occurs, an address discharge occurs. In this case, the address discharge refers to the point where the discharge cells 126 to be implemented with the image corresponding to the external video signal intersect with one of the X electrode and the Y electrode, usually the Y electrode 112 and the address electrode 122. The discharge cell 126 is selected to be present, and a predetermined pulse voltage of opposite polarity is applied to the Y electrode 112 and the address electrode 122 to cause the discharge cell 126 to discharge. While the discharge refers to a discharge in which charged particles adhere to the side of the dielectric layer 115 in the discharge cell 126 to accumulate wall charges.

In order to cause the address discharge to occur in the selected discharge cell 126, a predetermined potential must be applied to the address electrode 122 and the Y electrode 112 as described above. In this case, the Y electrode 112 is preferably disposed close to the address electrode 122. When the Y electrode 112 and the address electrode 112 are disposed close to each other, the electric field formed in the discharge cell 126 is increased by the potential applied to the Y electrode and the address electrode, so that address discharge is easily generated. Because.

Therefore, the driving voltage causing the address discharge can be lowered in causing the address discharge of the required level to occur, thereby lowering the price of the integrated circuit chip controlling the address electrodes 122.

On the other hand, after the address discharge occurs, when the high potential pulse potential is applied to the Y electrode 112 and the low potential pulse potential is applied to the X electrode 113, the X electrode 113 and the Y The wall charges accumulated on the inner side of the discharge cell 126 during the address discharge move due to the potential difference generated between the electrodes 112. At this time, as the wall charges move, the discharge gas atoms in the discharge cells 126 collide with the wall charges, thereby causing a discharge to generate plasma. Such a discharge is more likely to occur from portions close to each other of the X electrode 113 and the Y electrode 112 in which a relatively strong electric field is formed.

In the plasma display panel 200 according to the present invention, in the sustain discharge, the electrodes are disposed in the dielectric layer 115 to surround the discharge cells 126, unlike the conventional AC three-electrode surface discharge plasma display panel. As a result, the probability of the discharge occurring on the side surfaces of the discharge cells 126 in the vicinity where the X electrode 113 and the Y electrode 112 are disposed increases, which is different from that of the conventional AC three-electrode surface discharge plasma display panel. Discharge may occur at four sides surrounding the discharge cell 126, thereby greatly increasing the probability of discharge and the amount of discharge.

In addition, when the discharge is successfully generated along the inner side of the discharge cell 126, and the potential difference between the X electrode 113 and the Y electrode 112 is maintained for a predetermined time, the side of the discharge cell 126 The electric field formed in the center is strongly concentrated in the center, and the area of discharge is greatly enlarged as compared with the prior art, thereby increasing the amount of ultraviolet rays generated by the discharge.

In addition, since the electric field is strongly concentrated in the center during discharge, the amount of accelerated charged particles proceeding to the phosphor layer 125 is lower than that of the alternating three-electrode surface discharge type, and thus ion sputtering is a phenomenon in which ions collide with the phosphor layer. The likelihood of this occurrence can be reduced to increase the lifetime of the phosphor layer.

Meanwhile, the ultraviolet rays generated by the discharge excite the phosphor layers 125 disposed in the discharge cells 126, and generate visible light while the excited phosphor layers move to a low energy level, thereby realizing an image of the plasma display panel. do.

On the other hand, if the potential difference between the X electrode 113 and the Y electrode 112 becomes lower than the discharge voltage after the discharge is generated, the discharge is no longer generated, and the space charge and the wall charge are formed in the discharge cell 126. do. At this time, when the polarity of the pulse voltage between the X electrode 113 and the Y electrode 112 is changed to form a potential difference lower than the applied potential difference, the discharge starting voltage is reached again with the help of the wall charge. Discharge will occur. If the pulse potential is alternately applied between the X electrode 113 and the Y electrode 112 repeatedly, the discharge is maintained. The gray scale of the plasma display panel 200 is determined by the sustain discharge, thereby realizing an image.

2 and 5, the dielectric layer 115 includes a dielectric layer 115b surrounding an address electrode 122 and a dielectric layer 115a surrounding an X electrode 113 and a Y electrode 112. And dielectric constants are formed differently. In the present invention, the dielectric constant of the dielectric layer 115b surrounding the address electrode 122 is made lower than that of the dielectric layer 115a surrounding the X electrode 113 and the Y electrode 112. This is to reduce power consumption of the entire plasma display panel 200 and to reduce heat during discharge generated between the address electrodes 122.

That is, in the plasma display panel 200 having the structure described above, since each of the electrodes 112, 113, and 122 is a closed electrode, the address electrodes 122 adjacent to the side of the address electrode 122 are adjacent. Capacitance increases between. This is because the electrode area is increased and the distance between the electrodes is closer, which may increase the power consumed by the address electrode 122, thereby increasing heat generation at the address electrode 122. In addition, between the X electrode 113 and the Y electrode 112, the power consumption increases due to an increase in the displacement current due to the increase of the panel capacitance, thereby preventing the panel efficiency from being maximized.

As a countermeasure, a dielectric material having a lower dielectric constant than the dielectric material 115b surrounding the address electrode 122 may be used. As described above, when the dielectric layer is composed of dielectrics having different dielectric constants, and the dielectric layer 115b surrounding the address electrode 122 is formed of a dielectric having a low dielectric constant, the following effects can be obtained. First, the capacitance of the overall plasma display panel 200 is reduced. Accordingly, it is possible to reduce the displacement current and lower the power consumption, and ultimately maximize the panel efficiency. In addition, since the capacitance between the address electrodes 122 is reduced in relation to the adjacent discharge cells, it is possible to lower the current of the address electrode 122, thereby reducing power consumption of the address electrode 122. Since it is possible to reduce, the heat generation amount of the address electrode 122 can be reduced.

FIG. 6 shows another embodiment compared to the embodiment of the present invention shown in FIG. 5. That is, it can be seen from FIG. 6 that the cross-sectional area of the address electrode 122 is significantly smaller than that of the X electrode 113 or the Y electrode 112. In the case where the size of the address electrode 122 is reduced in this manner, the capacitance of the address electrode 122 is reduced, so that heat generated during discharge of the address electrode 122 is reduced. In this case, the dielectric constant of the dielectric material surrounding the address electrode 122 does not have to be lower than that of other dielectric layers, and the above effects can be obtained only by making the cross-sectional area of the address electrode 122 small.

7 and 8 show another embodiment compared to the embodiment of the present invention shown in FIG. 5. That is, FIG. 7 illustrates an embodiment in which the phosphor layer 125 is formed on the back substrate 121. In FIG. 8, the phosphor layers 125 and 125 'are formed on both the front substrate 120 and the back substrate 121. FIG. An embodiment formed in is shown.

7 and 8, since the phosphor layers 125 and 125 ′ are formed on the rear substrate 121, the rear substrate 121 should be able to reflect visible light forward. This embodiment shows that the position of the phosphor layer may not be limited to that formed on the front substrate 120 as shown in FIGS. 2 and 5. In addition, the embodiment shown in FIG. 8 having a large area where the phosphor layer is formed can generate more visible light in the plasma display panel having the same electrode structure at the same voltage, thereby further improving the luminance of the plasma display panel and discharging the discharge. The efficiency can be improved.

The present invention having the above-described configuration provides the following effects.

First, since the electrodes, which are conventional components disposed on the optical path through which visible light travels, are disposed in the dielectric layer, components disposed on the front substrate are minimized, and thus the visible light transmittance is drastically improved to improve luminance. .

Secondly, it is possible to use a material other than ITO as the material for forming the electrode, thereby reducing the manufacturing cost of the electrode and facilitating the large area of the plasma display panel. In addition, the manufacturing cost of the plasma display panel is reduced because the expensive ITO is not required.

Third, the discharge is formed in three dimensions in the entire discharge cell, and the driving voltage is prevented from increasing while sufficiently increasing the distance between the X electrode and the Y electrode, so that many discharges can be generated even at a low voltage. As a result, an integrated circuit chip driven at a low voltage can be used, thereby reducing the manufacturing cost of the plasma display panel.

Fourth, ion sputtering generated in the phosphor can be reduced.

Fifth, it is possible to further increase the discharge efficiency by lowering the capacitance of the plasma display panel to reduce power consumption, and reduce heat generated at the address electrode by lowering the capacitance between the address electrodes.

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.

Claims (10)

Front substrate; A rear substrate disposed to face the front substrate; A dielectric layer disposed between the front substrate and the rear substrate and defining discharge cells which are spaces in which discharge occurs; An electrode pair having an X electrode, a Y electrode, and an address electrode arranged to be spaced apart from each other in the dielectric layer; A phosphor layer disposed in the discharge cell; And And a dielectric material surrounding the address electrode, wherein the dielectric material surrounding the address electrode has a smaller dielectric constant than the dielectric material surrounding the other electrode. Front substrate; A rear substrate disposed to face the front substrate; A dielectric layer disposed between the front substrate and the rear substrate and defining discharge cells which are spaces in which discharge occurs; An electrode pair having an X electrode, a Y electrode, and an address electrode arranged to be spaced apart from each other in the dielectric layer; A phosphor layer disposed in the discharge cell; And And a discharge gas existing in the discharge cell, wherein a cross-sectional area of the address electrode is smaller than that of the X and Y electrodes. The method according to claim 1 or 2, And the electrodes are arranged in order from the front in order of an X electrode, an address electrode and a Y electrode. The method according to claim 1 or 2, And the dielectric layer defines the discharge cells such that a cross section of the discharge cell is a closed surface. The method of claim 4, wherein And the X electrode, the Y electrode and the address electrode are arranged to surround the discharge cell. The method according to claim 1 or 2, The X electrode, the Y electrode and the address electrode respectively extend in a ladder shape, The X electrode and the Y electrode extend in the same direction, And the address electrode extends in a direction orthogonal to the X and Y electrodes. The method according to claim 1 or 2, And a protective film disposed to cover at least a portion of the dielectric layer. The method according to claim 1 or 2, And the phosphor layer is disposed in a groove formed in the front substrate. The method according to claim 1 or 2, And the phosphor layer is disposed in a groove formed in the rear substrate. The method according to claim 1 or 2, And the phosphor layer is disposed in grooves formed in the front substrate and the rear substrate.

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