KR100647648B1 - Plasma display panel - Google Patents

Abstract

The present invention introduces a new discharge cell structure, which dramatically increases the transmittance and discharge amount of visible light, optimizes the arrangement of the dielectric layer covering the address electrode, reduces the generation of reactive power and heat, and induces stable address discharge. To provide a display panel,

In order to achieve this object, the present invention is disposed to face the transparent front substrate and the front substrate, disposed between the front substrate and the rear substrate is sealed with the front substrate, the front substrate and the rear substrate, causing the discharge Electrode pairs defining a discharge cell that is a space and formed of a dielectric, surrounding the discharge cells in the partition wall, and having an X electrode and a Y electrode spaced apart from each other and extending in parallel in one direction; A phosphor layer disposed in the discharge cell, an address electrode disposed between the rear substrate and the phosphor layer and extending across the discharge cells so as to cross the electrode pair and the discharge cell, and the address electrode is covered. A dielectric layer disposed between the phosphor layer and the rear substrate, and a discharge gas present in the discharge cell. The dielectric layer is provided with a plasma display panel, wherein grooves are formed in portions except for portions covering the address electrodes.

Description

Plasma display panel {Plasma display panel}

1 is an exploded perspective view showing a plasma display panel of the present invention;

2 is a plan schematic diagram of a discharge cell for explaining the arrangement of the dielectric layers of the plasma display panel of the present invention;

3 is a perspective view for explaining the arrangement of the discharge cells, electrode pairs and address electrodes of the plasma display panel of the present invention;

4 is a cross-sectional view of the plasma display panel of the present invention taken along line IV-IV;

5 is an exploded perspective view showing a modification of the plasma display panel of the present invention;

6 is a cross-sectional view of the plasma display panel of the present invention taken along the VI-VI line.

<Description of Symbols for Major Parts of Drawings>

100, 200: plasma display panel

110, 210: front panel 120, 220: rear panel

115: forward bulkhead 124: rear bulkhead

130, 230: partition 114, 214: electrode pair

122: address electrode 123: dielectric layer

223 rear dielectric layer 125 phosphor layer

126, 226: discharge cell

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel. More particularly, a novel discharge cell structure is introduced to dramatically increase the transmittance and discharge amount of visible light, and optimize the arrangement of a dielectric layer covering an address electrode to generate reactive power and generate heat. The present invention relates to the provision of a means for reducing the number and inducing a stable address discharge.

In general, a plasma display panel is an apparatus for displaying an image using a gas discharge phenomenon, and is excellent in various display capacities such as display capacity, brightness, contrast, afterimage, viewing angle, etc. have. In such a plasma display panel, a discharge occurs in a discharge cell filled with a discharge gas by a direct current or an alternating voltage applied between electrodes, and ultraviolet rays emitted from the discharge gas excite the phosphor to emit visible light, thereby generating an image. Implement

Among the plasma display panels, a plasma display panel that is widely used is an alternating current type three-electrode surface discharge plasma display panel in which a pair of sustain electrodes are positioned on the rear surface of the front substrate and discharge occurs on the rear surface of the front substrate.

The AC-type three-electrode surface discharge plasma display panel has an electrode pair and a front dielectric layer for discharging on the rear surface of the front substrate through which visible light passes, and the transmittance of visible light is significantly reduced, resulting in a decrease in luminance.

In addition, in such an AC type three-electrode surface discharge plasma display panel, since the electrode pairs for discharging are disposed on the rear surface of the front substrate, most of the electrode pairs are used to pass visible light generated in the phosphor layer disposed inside the discharge cells. It should be formed of high resistance ITO electrode. Therefore, a voltage drop may occur at the ITO electrode, which causes a problem that the driving voltage increases and the screen is uneven.

On the other hand, in order to improve the high resistance characteristics of the ITO electrode by connecting the bus electrode formed of a metal to the ITO electrode to improve the problem of the voltage drop, the width of the bus electrode is limited due to the visible light transmittance problem, the driving voltage The problem of increase and screen unevenness is not improving.

In addition, in such an AC-type three-electrode surface discharge plasma display panel, an electrode for discharging is formed on the back surface of the front substrate through which visible light passes, so that the discharge is concentrated only in a part of the discharge cell, thereby discharging the space of the discharge cell. Could not be used efficiently. As a result, this inefficiency forced the formation of a high driving voltage for discharging, thereby increasing the price of the driving circuit which occupies a large part of the price of the plasma display panel.

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, causing ion sputtering to the phosphor. There is a problem that the probability increases and thereby causes a permanent afterimage on the screen.

In addition, in the conventional plasma display panel, in order for a predetermined image to be realized by emitting visible light in response to an external image signal, a discharge cell to be discharged must be correctly selected to generate a discharge. By the way. The selection of such discharge cells is generally performed by accumulating wall charges in the discharge cells by causing discharge to occur in the discharge cells where one electrode and the address electrode of the electrode pair intersect. Therefore, since the discharge cell displaying the image can be accurately selected only when the address discharge directly involved in the selection of the discharge cell occurs stably, the stable generation of the address discharge is very important for the image implementation of the plasma display panel. Play a role.

However, since such an address discharge is an initial discharge that generates wall charges in a discharge cell, it is difficult to stably generate a discharge and a relatively high potential must be applied to the electrodes in order to generate a stable discharge. At this time, such a high potential generates a large amount of displacement current, thereby generating reactive power that does not contribute to discharge, thereby increasing power consumption of the plasma display panel.

By the way. In general, the plasma display panel has a higher power consumption than other home appliances, so optimization of power consumption is a very serious problem, but no clear solution has been proposed.

In addition, since the plasma display panel generates a considerable amount of heat during operation, such heat adversely affects the phosphor layer disposed inside the plasma display panel, resulting in a side effect of distorting the image or creating an afterimage. Dissipating heat is a very important issue. At this time, heat generated in the plasma display panel is caused by various factors inside the plasma display panel, but heat generated in the dielectric layer is induced when the charged particles are induced through the dielectric layer by the potential applied to the electrode. This has a significant effect on the heat generation, and needs to be addressed.

The present invention is intended to solve the following matters to solve the above problems.

First, it aims to increase brightness by improving aperture ratio and remarkably improving the transmittance of visible light.

Secondly, it is an object to make it possible to use a material other than ITO as a material for forming an electrode, to reduce the manufacturing cost of the electrode, to improve the electrical conductivity, and to facilitate the large area of the plasma display panel.

Third, an object of the present invention is to reduce the manufacturing cost of the plasma display panel by increasing the amount of discharge by causing the discharge to be three-dimensionally formed in the entire discharge cell, thereby reducing the driving voltage.

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

Fifthly, the purpose of the present invention is to optimize the arrangement of the dielectric layers covering the address electrodes, thereby reducing displacement current generated during address discharge, thereby minimizing reactive power, thereby improving power consumption efficiency.

Sixthly, an object of the present invention is to reduce heat generated in a plasma display panel by reducing heat generated in a dielectric layer affected by a potential applied to an address electrode when the plasma display panel is driven.

Seventhly, an object of the present invention is to provide a means for more stable address discharge under the same conditions.

In order to achieve the above object, the present invention is disposed to face the transparent front substrate and the front substrate, the rear substrate and the edge is sealed with the front substrate, disposed between the front substrate and the rear substrate, the discharge Electrode pairs defining a discharge cell which is a space for generating a discharge cell and a partition wall formed of a dielectric, and an X electrode and a Y electrode disposed to surround the discharge cell in the partition wall and spaced apart from each other and extending in parallel in one direction. A phosphor layer disposed in the discharge cell, address electrodes disposed between the rear substrate and the phosphor layer and extending across the discharge cells so as to intersect the electrode pair and the discharge cell; A dielectric layer disposed between the phosphor layer and the back substrate so as to cover the discharge layer; and a discharge gas existing in the discharge cell. And a groove formed in a portion of the dielectric layer except for a portion covering the address electrode.

Through the plasma display panel of the present invention, the aperture ratio is improved, the transmittance of visible light generated in the phosphor layer is improved, and the amount of discharge is drastically increased by inducing three-dimensional discharge inside the discharge cell, and through the dielectric layer during address discharge. By reducing the amount of displacement current flowing, the generation of reactive power is minimized, and the phosphor layer having a relatively low relative dielectric constant is filled in the grooves formed in the dielectric layer, thereby minimizing the possibility of heat generation when the plasma display panel is driven.

In the plasma display panel, the partition wall is divided into a front partition wall and a rear partition wall, and an X electrode is disposed on the front partition wall, and a Y electrode is disposed on the rear partition wall.

In the plasma display panel, the phosphor layer is preferably disposed in a space defined by at least a portion of the rear partition wall and a dielectric layer.

In addition, the plasma display panel may further include a protective film disposed on at least a portion of the side surface of the partition wall.

In the plasma display panel, the electrode pairs preferably extend in a ladder shape.

On the other hand, the present invention is disposed so as to face the transparent front substrate and the front substrate, the rear substrate is edge-sealed together with the front substrate, disposed between the front substrate and the rear substrate, the discharge cells which are spaces for generating a discharge Electrode pairs having a barrier rib defining a barrier rib, spaced apart from each other across the discharge cells, and having an X electrode and a Y electrode disposed behind the front substrate, and covering the electrode pairs; A front dielectric layer disposed at a rear side, a phosphor layer disposed in the discharge cell, extending across the discharge cells so as to intersect a direction in which the electrode pairs extend in the discharge cell, and between the rear substrate and the phosphor layer; Address electrodes disposed on the substrate, and a rear dielectric layer disposed between the rear substrate and the phosphor layer to cover the address electrodes; The plasma display panel may include a discharge gas existing in the discharge cell, and a groove may be formed in a portion of the rear dielectric layer except for a portion covering the address electrode.

In this case, in the plasma display panel, the phosphor layer is preferably disposed in a space defined by the barrier rib and the rear dielectric layer.

On the other hand, in all of the plasma display panel of the present invention, the groove is preferably formed so that the front surface of the back substrate is exposed, the dielectric layer is preferably formed in the groove so that the corner having a predetermined angle is formed. . At this time, due to the shape of the dielectric layer, it is possible to implement a stable address discharge.

In the plasma display panel of the present invention, at least a part of the phosphor layer is preferably disposed in the groove.

Hereinafter, exemplary embodiments of the plasma display panel 100 of the present invention will be described with reference to FIGS. 1 to 3.

 Plasma display panel 100 according to the present invention shown in Figure 1 is manufactured separately to facilitate the manufacturing process and the front panel 110 and the rear panel which is later joined by a coupling member such as a frit (Frit) ( 120).

On the other hand, the front panel 110 is provided with a front substrate 111 formed of a transparent material, preferably soda glass. In addition, the front panel 110 is formed on the rear of the front substrate, more specifically, the rear surface 111b of the front substrate, and the front substrate 111 and the rear substrate 121 and rear partition wall 124 to be described later. Together with the discharge cells 126, which are spaces that cause discharge, the front partition wall 115 is formed of a dielectric material.

In addition, the front panel 110 is disposed to surround the discharge cell 126 in the front partition wall and includes an X electrode 113 extending in one direction. In this case, since the X electrode is disposed in the front partition wall 115, the X electrode is not positioned on the optical path, which is the path through which visible light passes, and thus, the X electrode does not need to be formed as a transparent ITO electrode. It is possible to form.

On the other hand, the front partition wall 115 may be formed of a glass component including elements such as Pb, B, Si, Al and O, etc., if necessary, ZrO ₂ , TiO ₂ , and Al ₂ O ₃ It may be formed of a dielectric including a filler (filler) and pigments such as Cr, Cu, Co, Fe, TiO _2, etc., the dielectric is charged particles when a pulse voltage is applied to the X electrode 113 By inducing the wall charge participating in the discharge to enable the drive through the memory effect, and serves to protect the X electrode 113 from being damaged due to the collision of charged particles accelerated during discharge.

Meanwhile, the front panel 110 includes a passivation layer 116 disposed to cover the side surface 115a of the front partition wall 115 in the discharge cell 126. In this case, the passivation layer 116 may be disposed by a deposition method using MgO or the like, and the passivation layer 116 is not disposed on the optical path of visible light, and thus has excellent emission characteristics and strong durability of secondary electrons. It may be formed of a material such as carbon nanotubes (CNT). On the other hand, the carbon nanotubes may be arranged in addition to the deposition by a CVD method.

On the other hand, when the deposition process is used to arrange the protective film 116 on the front panel 110, there is a case where the protective film is additionally disposed on the rear surface of the rear surface 111a of the front substrate. Although this protective film reduces the transmittance of visible light to some extent, it has the aspect which contributes to discharge by increasing the emission amount of secondary electron at the time of discharge.

On the other hand, the rear panel 120 is preferably provided with a back substrate 121 formed of soda glass or the like. In this case, the back substrate is not a component located on an optical path through which visible light generated in a discharge cell travels, and thus it is not necessarily formed of transparent glass, for reducing reactive power or weight. It can be formed from other materials such as plastic and metal.

On the other hand, the rear panel 120 is disposed between the front partition wall 115 and the rear substrate 121, the space causing the discharge along with the front partition wall 115, the front substrate 111 and the rear substrate 121. Phosphorous discharge cells 126 are defined and have a rear partition 124 formed of a dielectric. In this case, the rear bulkhead 124 may be formed of the same material as the front bulkhead 115. In addition, the front partition wall 115 and the rear partition wall 124 form the partition wall 130 by combining the front panel 115 and the rear partition wall 124 when the plasma display panel 100 is manufactured. In this case, the bond means a simple physical contact, and does not exclude a chemical bond or a bond by an adhesive.

In addition, the rear panel 120 is disposed to surround the discharge cell 126 in the rear partition 124 and includes a Y electrode 112 extending in parallel with the direction in which the X electrode 113 extends. do. In this case, since the Y electrode 112 also does not exist on the optical path through which visible light travels, unlike the AC-type three-electrode surface discharge plasma display panel, the Y electrode 112 does not need to be formed of ITO or the like. It may be formed of a material having good conductivity.

In this case, as described above, the front partition wall 115 is provided in the front panel 110, the rear partition wall is provided in the rear panel 120, and the X electrode 113 is in the front partition wall 115. The Y electrode 112 is formed to be disposed in the rear partition wall 130, and the front panel 110 and the rear panel 120 are coupled to each other in a state where the front panel 110 and the rear panel 120 are completed. Each of the X electrode 113 and the Y electrode 112 disposed in the 124 may be shortened with each other due to a defect that may occur during the process.

That is, when the X electrode and the Y electrode are disposed in the bulkhead in the process of forming one partition wall, the X electrode and the Y electrode are often shorted to each other during the process, but the plasma display panel of the present invention In the front bulkhead 115 and the rear bulkhead 124 are manufactured separately, and the X electrode and the Y electrode on each of the front bulkhead and the rear bulkhead can be generated during the arrangement of the X electrode and the Y electrode by a separate process. The possibility of shortening of the X electrode and the Y electrode due to the defective process can be significantly reduced.

On the other hand, in the present invention, since the arrangement of the X electrode 113 and the Y electrode 112 is not necessarily made separately, and the arrangement of the X electrode and the Y electrode is not limited by the above-described process, The front bulkhead 115 and the rear bulkhead 130 do not need to be separated from each other, and an integral bulkhead in which the front bulkhead and the rear bulkhead are coupled to either the front panel 110 or the rear panel 120 ( 130). Therefore, the partition wall of the plasma display panel of the present invention is not necessarily separated into the front partition wall and the rear partition wall, and the arrangement of the X electrode and the Y electrode is the same.

On the other hand, the X electrode 112 provided in the front panel and the Y electrode 112 provided in the rear panel constitute an electrode pair 114. At this time, as described above, since the electrode pair 114 is disposed in the partition wall 130 unlike the conventional AC plasma display panel, since the electrode pair 114 does not exist on the optical path that is a traveling path of visible light generated in the phosphor layer 125, Visible light is not blocked due to the presence of the electrode pair, and the aperture ratio of the discharge cell 126 is dramatically increased.

On the other hand, in the shape of the discharge cell 126 defined by the partition wall 130, although the cross section is shown in Figure 1 as being rectangular, there is no limitation on the shape of the discharge cell, polygonal, circle, honeycomb form Various forms of shape can be modified.

On the other hand, the rear panel 120 is disposed between the phosphor layer 125 to be described later and the back substrate 121, more specifically in the preferred embodiment of the present invention is disposed on the front surface (121a) of the back substrate, Address electrodes 122 extend across the discharge cells 126 to intersect the electrode 114 and the discharge cells 126. In this case, since the layers having various shapes and functions, such as a reflective layer and a near-infrared shielding layer, may be formed on the rear substrate, the address electrode is disposed between the rear substrate and the phosphor layer. .

At this time, since the address electrode 122 is not positioned on the optical path, which is the path through which visible light travels, similarly to the electrode pair 114, it is not necessary to form a transparent ITO electrode, and has good electrical conductivity of Ag, Cu, Cr. Or the like.

Meanwhile, the rear panel 120 includes a dielectric layer 123 disposed to cover the address electrode 122. Of course, when the phosphor layer 125 to be described later is disposed to cover the address electrode 122, the address electrode 122 may be protected from collision due to charged particles accelerated during discharge, rather than being alone, Since the layer is generally porous, if the address electrode 123 is not covered by a separate dielectric layer, damage to the address electrode occurs due to accelerated collision of charged particles, resulting in a limited lifetime of the plasma display panel. . Therefore, the address electrode 122 is preferably covered by the dielectric layer 123.

On the other hand, the dielectric layer 123 is formed with a groove 127 in the portion except for the portion covering the address electrode 122. In this case, as shown in FIG. 2, the groove is preferably formed so that the remaining portion except for the portion covering the address electrode 122 is removed along the direction in which the address electrode 122 extends. In this case, the groove 127 is preferably formed so that the front surface 121a of the rear substrate 121 is exposed.

In addition, the dielectric layer 123 is preferably formed with a corner 123b having a predetermined angle. With the formation of the corner 123b, the electric field formed by the potential applied to the address electrode 122 during the address discharge is concentrated at the corner to form a strong electric field at the corner 123b, thereby, under the same conditions It is possible to implement stable address discharge because the acceleration of the charged particles more easily. On the other hand, the reason for the formation of the groove 127 and the reason for the formation of the corner 123b will be described in detail later.

Meanwhile, the rear panel 120 includes the phosphor layer 125 disposed in the discharge cell 126. In this case, the phosphor layer 125 may be disposed in a space defined by at least a portion of the rear partition 124 and the dielectric layer 123, and the groove 127 may expose the front surface 121a of the rear substrate. When the phosphor layer 125 is disposed so that the phosphor layer 125 is disposed in a space defined by at least a portion of the rear partition wall 124, the rear substrate 121, and the dielectric layer 123.

As described above, when the phosphor layer 127 is disposed in the groove 127, the amount of the phosphor layer 125 may be increased by the space in which the groove is formed. This is because the luminous efficiency of the visible light of the phosphor disposed on the phosphor layer is limited, in order to increase the amount of visible light it is necessary to increase the amount of the phosphor with the increase of the discharge amount, in the case of increasing the amount of the phosphor Since the space of the discharge cells 126 is reduced by that amount, there is a problem in that the amount of discharge is lowered. Thus, as in the present invention, the grooves 127 are formed in the dielectric layer 123, and the grooves 127 are formed. The phosphor layer may be additionally disposed on the substrate to contribute to increase the amount of visible light under the same conditions, thereby increasing the luminance of the plasma display panel 100.

Meanwhile, the phosphor layer 125 may be divided into red, green, and blue light emitting phosphor layers and disposed in the discharge cell 126 so that the plasma display panel may realize a color image. The green, blue, and blue light emitting phosphor layers may be disposed inside the discharge cell to form a unit pixel for implementing a color image.

At this time, the process of arranging the phosphor layer 125 is dried after the phosphor paste mixed with the phosphor, the solvent, and the binder of any one of the red phosphor, the green phosphor, and the blue phosphor is applied to the space where the phosphor layer is disposed. And it may be formed by going through a calcination process.

In this case, examples of the phosphor that can be used for the phosphor layer include (Y, Gd) BO ₃ : Eu ³⁺ as the red light-emitting phosphor, and Zn ² Si 04: Mn ²⁺ as the green light-emitting phosphor. BaMgAl ₁₀ O ₁₇ : Eu ²⁺ may be used as the phosphor, and various phosphors may be used.

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

On the other hand, the rear panel 120 is preferably a protective film 116 is disposed on the side surface (124a) of the rear partition 124. Like the passivation layer described above, the passivation layer 116 may use MgO or CNT, and may be disposed by a deposition process or the like.

Meanwhile, the front panel 110 and the rear panel 120 are joined and sealed by a coupling member such as a frit (not shown), and inside the discharge cell, Xen gas (10% before and after) is discharged. The discharge gas consisting of any one of neon (Ne), helium (He), or argon (Ar) or a mixed gas of two or more thereof is filled. In this case, since the discharge gas is generally charged at a pressure lower than atmospheric pressure, the front panel 110 and the rear panel 120 by the partition wall 130 formed by the combination of the front partition wall 115 and the rear partition wall 124. ) Is supported.

Hereinafter, the arrangement of the electrode pairs 114 of the plasma display panel 100 of the present invention will be described with reference to FIG. 3. 2 shows an arrangement of an electrode pair 114 having an X electrode 113 and a Y electrode 112, an address electrode 122, and a discharge cell 126. In this case, the X electrode 113 and the Y electrode 112 has a ladder shape and extends in parallel to each other along the direction of the x-axis, the X electrode 113 and the Y electrode 112 in the discharge cell 126. The address electrode 122 extends in the direction of the y-axis that intersects with the extending direction. Meanwhile, the X electrode and the Y electrode do not necessarily extend in a ladder shape, and in some cases, the extension may be extended by an extension having a predetermined size.

On the other hand, since the distance between the Y electrode 112 and the address electrode 122 is short, it is preferable that an address discharge for selecting a discharge cell in which sustain discharge will occur occurs between the Y electrode 112 and the address electrode 122, In this case, it is preferable that the Y electrode 112 be a scan electrode and the X electrode 113 be a sustain electrode.

In this case, since the address discharge refers to a discharge occurring independently in a discharge cell selected by the crossing of the Y electrode and the address electrode, the meaning that the Y electrode 112 becomes a scan electrode means that an address electrode (for each of the Y electrodes 112) is used. Like 122), it means that the driving pulse signal is applied independently.

In addition, the X electrode 113 becomes the sustain electrode, which means that the entire driving pulse signal is applied to all of the X electrodes without applying an independent driving pulse signal, thereby causing sustain discharge. (113) is used. However, all of the X electrodes 113 do not necessarily need to have a signal applied in common, and if necessary, a signal may be applied separately between the X electrodes.

Hereinafter, an example of the operation of the plasma display panel 100 and the reason for forming the groove 127 and the reason for forming the corner 123b in the present invention will be briefly described with reference to FIG. 4.

The driving method for driving the plasma display panel according to the present invention may include various driving methods such as ADS driving and ALIS driving, and various factors such as image quality and response speed of the plasma display panel may vary depending on the driving method. Since the essential features of the present invention are not changed, an example of driving the plasma display panel of the present invention will be described below with reference to the ADS driving method.

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 thus, the desired control between the discharge cells is desired when the discharges occurring in the discharge cells are to be controlled in a uniform manner. It happens that it is difficult to make. In order to prevent such a difficulty of the discharge control, by applying a high voltage of a predetermined level or more to the discharge cells at the same time to generate the discharge in all the discharge cells by removing the wall charges existing in the discharge cells to equalize, discharge cells Induced to be the same state of the charged particles in this is called a reset discharge.

Such a reset discharge is generally performed by applying a high potential lamp potential to all the Y electrodes 112 and applying a ground potential to all the address electrodes 122 to discharge all of the discharge cells.

Then, after the above-described reset discharge occurs, an address discharge occurs. In this case, the address discharge refers to a discharge cell in which one of the electrode pairs 114, that is, the Y electrode 112 and the address electrode 122, intersects a discharge cell in which an image is to be implemented in response to an external image signal. 126, a predetermined pulse voltage of opposite polarity is applied to the Y electrode 112 and the address electrode 122 to cause the discharge cell to discharge, and the discharge cell is caused by the discharge. The sidewalls of the barrier ribs 130 in the interior, more specifically, the charges are attached to the sidewalls 124c of the rear barrier ribs 124 to refer to the discharge to accumulate wall charges.

In this case, in order to cause the address discharge to occur in the selected discharge cell 126, a predetermined pulse voltage must be applied to the address electrode 122 and the Y electrode 112 as described above. In this case, when a predetermined pulse voltage is applied to the address electrode 122, the molecules of the dielectric are polarized by the pulse voltage applied to the address electrode 122, and the polarized molecules rotate. In this process, a displacement current flows through the dielectric 123.

At this time, the displacement current can be easily confirmed by the formula I = C * dv / dt. In this equation, I is the displacement current, C is the dielectric constant of the dielectric, dv / dt is the change over time of the pulse voltage. At this time, the power factor of the power supplied by the displacement current is reduced so that the power as much as the reactive power does not participate in the discharge, and in addition, the displacement current flows while the polarized or rotated molecules of the dielectric are It consumes power by consuming heat energy. Herein, it will be referred to as reactive power including both theoretical reactive power generated by decreasing power factor and power consumed by thermal energy generated by rotation of molecules of dielectric.

On the other hand, as a result of the pulse voltage applied to the address electrode, a displacement current is generated in the dielectric layer as described above, and to accelerate the charged particles in the discharge cell due to the consumption of reactive power caused by the generation of the displacement current. Only part of the supplied power is utilized, and the rest is consumed as reactive power due to the generation of displacement current. At this time, as can be seen in the equation I = C * dv / dt, the displacement current I depends on the size of the capacitance C of the dielectric. Therefore, when the capacitance C is reduced, the magnitude of the displacement current I can be reduced.

Therefore, when the groove 127 is formed in the dielectric layer 123 as in the present invention, since the dielectric is removed as much as the groove is formed, the phosphor layer having a lower dielectric constant than the dielectric is disposed in the portion where the groove is formed, and thus, the address electrode It is possible to lower the dielectric constant of the dielectric covering the film, and as a result, the displacement current can be reduced, thereby reducing the reactive power generated by the pulse voltage applied to the address electrode.

On the other hand, it may be considered that the address electrode is covered only on the phosphor layer 125 by completely removing the dielectric layer covering the address electrode 122. In this case, as described above, the address when the plasma display panel is driven. Since the electrode may be damaged, it is preferable that the groove 127 is formed in a portion where the address electrode 122 is covered by the dielectric layer 123 and does not cover the address electrode.

On the other hand, the groove is preferably formed as large as possible, the groove is limited so that the dielectric breakdown does not occur in the dielectric layer covering the address electrode, the groove 127 is formed so as to expose the back substrate under such a restriction condition It is preferable to reduce the reactive power by reducing the displacement current.

On the other hand, as described above, the address discharge occurs while a predetermined driving pulse voltage is applied to the address electrode 122 and the Y electrode 112. In this case, the most important thing for the generation of the address discharge is not simply the magnitude of the driving pulse voltage. A driving pulse voltage is applied to the address electrode and the Y electrode to the magnitude of the electric field formed in the discharge cell 126. That is, the discharge is dependent on the charged particles accelerated by the electric field formed in the discharge cell, and in order for the charged particles to cause the discharge, the probability that the charged particles have a predetermined energy level or more must be a certain level or more. As a result, the magnitude of the electric field in the discharge cell has a significant effect on the discharge, which is the same in the address discharge.

At this time, when the corner 123b having a predetermined angle is formed in the dielectric layer 123, when a predetermined driving pulse voltage is applied to the address electrode, the electric field is concentrated at the corner portion, thereby increasing the size of the electric field. In addition, when the size of the electric field is increased in this way, the probability that the charged particles accelerated by the address electrode 122 and the Y electrode 112 will have a greater kinetic energy will increase, and as a result, the address discharge will be reduced under the same conditions. The probability of occurrence is increased. And this is directly connected with stable address discharge.

In addition, since the displacement current generated by the pulse voltage applied to the address electrode is reduced due to the formation of the groove 127 in the dielectric layer, the reactive power generated in the dielectric layer is reduced, which is due to the reduction of theoretical reactive power. However, the heat generated by the movement of the dielectric molecules is also reduced. Therefore, the reduction of the displacement current is directly connected to the reduction of heat generated in the plasma display panel 100, and thus, a problem such as an afterimage of the screen due to the temperature rise of the plasma display panel may be reduced.

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

At this time, in the case of the plasma display panel 100 of the present invention, the electrode pairs 130 are disposed in the partition wall 130 to surround the discharge cells, unlike the conventional AC three-electrode surface discharge plasma display panel. As a result, the probability of discharge occurring on the side surfaces of the discharge cells in the vicinity where the X electrode 113 and the Y electrode 112 are disposed increases, and thus, unlike the conventional AC three-electrode surface discharge plasma display panel, Discharge may occur on the inner side of the surroundings, 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, and the voltage between the discharge electrodes is maintained for a predetermined time, the electric field formed on the side of the discharge cell 126 is strongly concentrated in the center, The area of discharge is greatly enlarged as compared with the prior art, whereby the amount of ultraviolet rays generated by the discharge is increased.

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-type three-electrode surface discharge type, and ion sputtering phenomenon is a phenomenon in which ions collide with the phosphor layer. This occurs less frequently and can increase the life of the phosphor layer.

Meanwhile, the ultraviolet rays generated by the discharge excite the phosphor layer 125 disposed in the discharge cell, and the visible phosphor layer moves to a low energy level to generate visible light, thereby realizing an image of the plasma display panel.

On the other hand, when the voltage difference between the electrode pairs 130 is lower than the discharge voltage after the discharge occurs, the discharge is no longer generated, the space charge and the wall charge is formed in the discharge cell 126. At this time, when the polarity of the pulse voltage between the discharge electrodes is changed and a voltage lower than the applied voltage is applied, the discharge starting voltage is reached with the help of the wall charge, and the discharge is generated again. In addition, when the pulse voltage is alternately applied between the electrode pairs 130 alternately, the discharge is maintained. At this time, such discharge is called sustain discharge, and the gray scale of the plasma display panel 100 is determined by the sustain discharge, thereby realizing an image.

Hereinafter, the plasma display panel 200 according to a modified example of the present invention will be described with reference to FIGS. 5 to 6. The plasma display panel 200 of the modified example of the present invention includes a front panel 210 and a rear panel 220, which are the same as those of the present invention and are later joined by a joining member such as frit to seal an edge thereof. do. In addition, the rear panel 220 includes a partition wall 130 defining discharge cells 226 that are discharge spaces.

On the other hand, the front panel 210 is a transparent front substrate 111, the rear of the front substrate 111, more specifically, the Y electrode 212 and the X electrode 213 formed on the rear surface 111a of the front substrate 111 It is preferable to further include a pair of electrode 214 having a, a front dielectric layer 215 covering the electrode pair, and a protective film 216 covering the front dielectric layer. In this case, since a layer having various functions such as a near infrared ray blocking film or an electromagnetic wave shielding film may be disposed on the rear surface of the front substrate, the electrode pair 214 is not limited to the arrangement position on the rear surface of the front substrate. It is sufficient if the placement position of the back of the substrate is determined.

On the other hand, each of the Y electrode 212 and the X electrode 213 is a transparent electrode (212b, 213b) formed of ITO, etc. in consideration of the transmittance and resistance of visible light and the bus electrodes (212a, 213a) made of a metal having high conductivity Is preferably provided. In addition, the bus electrodes 212a and 213a may be connected to a connection cable (not shown) disposed on the left and right sides of the plasma display panel 200 to transfer a potential.

On the other hand, the rear panel 220 extends across the discharge cells so as to cross the direction in which the electrode pairs 214 extend in the back substrate 121 formed of glass or the like, and in the discharge cell 226. The address electrodes 122 disposed between the rear substrate 121 and the phosphor layer 125 disposed in the discharge cell 126, in detail, are disposed on the front surface 121a of the rear substrate 121. Equipped.

The rear panel 220 includes a rear dielectric layer 223 covering the address electrodes 122. In this case, the rear dielectric layer 223 is formed with a groove 227 in the portion except for the portion covering the address electrode like the dielectric layer 123 of the present invention. At this time, the function of the groove 227 and the reason for the arrangement is the same as that of the present invention.

On the other hand, the groove 227 is preferably disposed so that the front surface of the back substrate as in the present invention, the phosphor layer is preferably disposed in the groove 227. In addition, the dielectric layer is preferably formed with a corner 223b having a predetermined angle. At this time, the preferred embodiment of the groove described above is the same as that of the present invention. The address electrode 222 may be connected to a connection cable (not shown) disposed above and below the plasma display panel to receive an electrical signal.

On the other hand, the plasma display panel 200 of the modified example of the present invention is generally implemented by driving the ADS, but can be driven by various driving methods such as ALIS drive.

The present invention achieves the following effects.

First, since there are no electrode pairs or dielectrics on the path of visible light generated in the phosphor layer, the aperture ratio is improved, and thus the transmittance of visible light is remarkably improved.

Secondly, a material other than ITO can be used as the material for electrode formation because the electrode pairs are disposed within the partition wall and do not exist on the optical path of visible light, thereby reducing the manufacturing cost of the electrode pairs, and the electrical conductivity This is improved to facilitate the large area of the plasma display panel.

Third, since the electrode pairs are arranged to surround the discharge cells in the partition wall, the discharges are formed three-dimensionally throughout the discharge cells, thereby increasing the amount of discharges, thereby causing discharge in the discharge cells even at a low driving voltage. As a result, the price of the circuit chip for controlling the potential applied to the electrode pair can be lowered, thereby reducing the manufacturing cost of the plasma display panel.

Fourthly, since the acceleration of charged particles is concentrated in the center of the discharge cell, the ion sputtering to the phosphor is prevented to increase the lifetime of the phosphor.

Fifth, by optimizing the arrangement of the dielectric layer covering the address electrode to reduce the displacement current generated during the address discharge, thereby minimizing the reactive power to improve the power consumption efficiency.

Sixth, the heat generated in the dielectric layer affected by the potential applied to the address electrode during the driving of the plasma display panel is reduced to reduce the heat generated in the plasma display panel.

Seventhly, address discharge can be made more stable under the same conditions, and consequently, the image of the plasma display panel is 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.

Claims (10)

A rear substrate disposed to face the transparent front substrate and the front substrate, and the edge of which is sealed together with the front substrate; A partition wall disposed between the front substrate and the rear substrate and defining a discharge cell which is a space for generating a discharge and formed of a dielectric material; Electrode pairs disposed in the partition wall to surround the discharge cells and having X and Y electrodes spaced apart from each other and extending in parallel in one direction; A phosphor layer disposed in the discharge cell; Address electrodes disposed between the rear substrate and the phosphor layer and extending across the discharge cells to intersect the electrode pair with the discharge cells; A dielectric layer disposed between the phosphor layer and a rear substrate to cover the address electrode; And And a discharge gas existing in the discharge cell, And the groove is formed in a portion of the dielectric layer except for a portion covering the address electrode. The method of claim 1, And wherein the barrier rib is divided into a front barrier rib and a rear barrier rib, and an X electrode is disposed at the front barrier rib and a Y electrode is disposed at the rear barrier rib. The method of claim 2, And the phosphor layer is disposed in a space defined by at least a portion of the rear partition wall and a dielectric layer. The method according to any one of claims 1 to 3, And a passivation layer disposed on at least a portion of a side surface of the partition wall. The method according to any one of claims 1 to 3, And the electrode pairs extend in a ladder shape. delete delete delete delete delete

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