KR100730118B1 - Plasma display panel - Google Patents

Abstract

The present invention discloses a plasma display panel in which a groove is formed in a front substrate and a material having high thermal conductivity is filled in the groove to prevent bright afterimages caused by panel temperature differences during discharge.

The plasma display panel of the present invention comprises a front substrate having a groove formed on an inner side thereof; A rear substrate disposed to face the front substrate; A dielectric wall disposed between the front substrate and the rear substrate and defining a discharge space together with the front substrate and the rear substrate; A sustain electrode disposed separately along the circumference of the discharge space and having X and Y electrodes embedded in the dielectric wall; An address electrode disposed on the rear substrate and buried by a dielectric layer; A phosphor coated in the discharge space; And a filling film of a thermally conductive material disposed in the groove of the front substrate.

The groove is formed in the non-discharge region except for the discharge space, corresponding to the dielectric wall. The filling film disposed in the groove includes a non-oxide-based ceramic material such as silicon nitride or aluminum nitride.

Description

Plasma display panel {Plasma display panel}

1 is a cross-sectional view of a unit discharge cell of a conventional plasma display panel;

2 is a cross-sectional view of a unit discharge cell of a plasma display panel according to an embodiment of the present invention;

FIG. 3 is an exploded perspective view of a portion of the plasma display panel shown in FIG. 2;

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

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

220 ... back substrate 230 ... address electrode

241 Dielectric Layer 245 Dielectric Wall

250 bulkhead 260 holding electrode

261 ... X electrode 262 ... Y electrode

270 phosphor 280 protective layer

215: groove 290 ... filling membrane

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which a groove is formed on an inner surface of a front substrate to fill a thermal conductive material.

In general, a plasma display panel is a flat panel display device that discharges a sealed discharge gas between two substrates on which electrodes are formed, and excites a phosphor layer by ultraviolet rays generated by the discharge to realize a desired image.

The display device employing such a plasma display panel has a large screen, high quality, ultra-thin, light weight and excellent wide viewing angle, and is simpler to manufacture than other flat panel display devices and is easy to be enlarged. As the spotlight.

The plasma display panel is classified into a direct current (DC) type, an alternating current (AC) type, and a hybrid type according to a driving voltage applied to a discharge cell, and classified into a counter discharge type and a surface discharge type according to an arrangement of 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 discharge is performed by an electric field of wall charge instead of direct charge transfer between the corresponding electrodes.

In the opposite discharge type plasma display panel, an address electrode and a sustain 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 plasma display panel, an address electrode and corresponding X and Y electrodes are provided for each unit pixel to generate addressing discharge and sustain discharge.

BACKGROUND ART A direct current type plasma display panel has been recently adopted a plasma display panel having an alternating surface discharge structure due to a problem of direct charge transfer between corresponding electrodes, causing serious electrode damage.

1 illustrates a unit discharge cell of a conventional plasma display panel 100.

Referring to FIG. 1, the plasma display panel 100 includes a front substrate 110 and a rear substrate 120 disposed to face the front substrate 110. An inner surface of the front substrate 110 includes an X electrode 161 and a Y electrode 162, and a bus electrode 163 electrically connected to the X and Y electrodes 161 and 162. In addition, an inner surface of the front substrate 110 may include a front dielectric layer 145 formed to cover the X electrode 161, the Y electrode 162, and the bus electrode 163 and a surface of the front dielectric layer 145. A protective film 180 to be coated is provided.

An address electrode 130 formed on an inner surface of the rear substrate 120 and disposed in a direction crossing the X and Y electrodes 161 and 162 and a rear surface disposed to cover the address electrode 130. Dielectric layer 141 is provided. The discharge space S is defined by the barrier rib 150 disposed between the front and rear substrates 110 and 120, and the barrier rib 150, the front substrate 210, and the rear substrate 220 are defined by the barrier rib 150. The phosphor layer 170 is disposed in the limited discharge space S.

However, the conventional surface discharge plasma display panel 100 including the AC type three electrode surface discharge plasma display panel, as shown in FIG. 1, causes the X electrode 161 and the Y electrode to cause discharge to the front substrate 110. Since not only the 162 and the bus electrode 163 but also the dielectric 145 and the protective layer 180 exist, visible light emitted from the phosphor 170 in the discharge space S passes through the front substrate 110. There is a problem that the transmittance is significantly reduced and the luminance decreases.

In addition, in the conventional plasma display panel 100, since the X electrode 161, the Y electrode 162, and the bus electrode 163, which cause discharge, are disposed on the front substrate 110 through which visible light passes, the discharge is discharged. It is generated and diffused behind the passivation layer 180 in the cell S. Accordingly, since the discharge is concentrated only on a part of the discharge cell, there is a problem that the efficiency of the plasma display panel is lowered.

On the other hand, in the conventional plasma display panel, when the panel 100 is used for a long time, the electrodes causing the discharge are arranged on the front substrate 110, so that the discharge causes the phosphor layer 170 behind the front dielectric layer 145. To this end, the charged particles of the discharge gas causes ion sputtering on the phosphor by an electric field, thereby causing a permanent afterimage.

To solve this problem, a ring-type electrode is formed between the front substrate and the rear substrate to surround the wall of the discharge cell with a discharge electrode, and a sidewall dielectric is formed between the two electrodes to insulate them. In addition, it has been proposed in a plasma display panel having an electrode structure in which a protective film layer is formed on the sidewall dielectric to protect the dielectric.

In the plasma display panel having a ring-shaped electrode structure, an upper opening of the discharge space is sealed by a front substrate, and a discharge electrode or bus electrode made of ITO film, a dielectric layer formed to cover them, and a protective film are not formed on the front substrate. In addition, it was possible to maximize the luminous efficiency by improving the aperture ratio and improving the transmittance.

However, in the conventional plasma display panel having a ring-shaped electrode structure, the front substrate includes a glass substrate, and the glass substrate has a low thermal conductivity of about 0.8 W / mK. There was an issue present.

The present invention is to solve the above problems, by forming a groove on the inner surface of the front substrate to fill the film with a high thermal conductivity, improve the thermal conductivity of the front substrate to produce a bright afterimage according to the temperature difference of the panel during discharge It is an object of the present invention to provide a plasma display panel that can be prevented.

The present invention in order to achieve the above object is a front substrate formed with a groove on the inner surface; A rear substrate disposed to face the front substrate; A dielectric wall disposed between the front substrate and the rear substrate and defining a discharge space together with the front substrate and the rear substrate; A sustain electrode disposed separately along the circumference of the discharge space and having X and Y electrodes embedded in the dielectric wall; An address electrode disposed on the rear substrate and buried by a dielectric layer; A phosphor coated in the discharge space; It is characterized by providing a plasma display panel including a filling film of a thermally conductive material disposed in a groove of the front substrate.

The groove is formed in the non-discharge region except for the discharge space, corresponding to the dielectric wall.

The groove is formed in the non-discharge region except for the discharge space along at least one of the direction parallel to the address electrode or the direction crossing the address electrode.

The filling film disposed in the groove includes a non-oxide-based ceramic material such as silicon nitride or aluminum nitride.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 illustrates a cross-sectional view of a plasma display panel according to an exemplary embodiment of the present invention, and illustrates a cross-sectional view of a unit discharge cell. FIG. 3 is an exploded perspective view illustrating a portion of the plasma display panel of the present invention shown in FIG.

2 and 3, the plasma display panel 200 according to an exemplary embodiment of the present invention includes a front substrate 210 and a rear substrate 220 disposed to face the front substrate 210. The front substrate 210 includes a transparent glass substrate including components such as PbO, SiO 2, B 2 O 3, and the like. The rear substrate 200 also includes a transparent glass substrate similar to the front substrate 210. The front substrate 210 and the rear substrate 220 are sealed to each other by frit glass.

The address electrode 230 is disposed on an inner surface of the rear substrate 220. The address electrode 230 is disposed in a direction parallel to the Y direction, and has a stripe shape disposed to be spaced apart by a predetermined interval in the X direction. The address electrode 230 is arranged for each discharge space S of each unit discharge cell, and is formed using a metal material having excellent conductivity, for example, silver paste.

 In the embodiment of the present invention, the address electrode 230 has a stripe-shaped pattern so as to correspond to each discharge space S in order to apply a voltage for selecting the discharge space S to start discharge. Rather than the shape of the discharge space (S) may have a variety of patterns. In addition, the address electrode 230 may be disposed on the rear substrate 220, but is not necessarily limited thereto, and may be disposed at an appropriate position such as the partition wall 250.

The dielectric layer 241 is entirely formed on the rear substrate 220 to cover the address electrode 230. In the exemplary embodiment of the present invention, the dielectric layer 241 is formed on the front surface of the substrate to cover the address electrode 230, but is not necessarily limited thereto, and may be patterned to cover only the address electrode 230.

Sidewalls forming a plurality of discharge spaces S, that is, a plurality of barrier ribs 250, are disposed between the dielectric layer 241 and the rear substrate 220 of the front substrate 210. The partition 250 has a horizontal partition 252 disposed in a direction orthogonal to the address electrode 230, that is, an X direction, and a vertical partition 251 disposed in a direction parallel to the address electrode 230, that is, in a Y direction. Includes. The partition wall 250 including the vertical partition wall 251 and the horizontal partition wall 252 has a grid shape and defines a plurality of discharge spaces S by the partition wall 250. A rectangular discharge space S is formed by the partition wall 250.

In the exemplary embodiment of the present invention, the partition wall 250 has a lattice shape, and the discharge space S defined by the partition wall 250 is illustrated as having a rectangular shape, but is not necessarily limited thereto. 250 may have various forms to form a plurality of discharge spaces (S).

For example, the partition 250 may have an open partition such as a stripe type or meander type, as well as a closed partition such as a matrix or delta type. In addition, in the case of the closed partition wall, as in the embodiment of the present invention, the discharge space S formed by the partition wall 250 may have a shape such as a circle or an ellipse as well as a polygon, such as a triangle or a pentagon, in addition to a rectangle. Can be.

In the present exemplary embodiment, the barrier rib 250 is disposed on the dielectric layer 241. However, the barrier rib 250 is disposed on the rear substrate 220, and the barrier rib 250 is disposed on the rear substrate 220. The address electrode 230 and the dielectric layer 241 may be sequentially disposed on the 220.

The storage electrode 260 is disposed between the front substrate 210 and the partition 250. The sustain electrode 260 includes an X electrode 261 disposed relatively adjacent to the front substrate 210, and a Y electrode 262 disposed relatively adjacent to the rear substrate 220. The X electrode 261 and the Y electrode 262, which are the sustain electrode 260, are embedded by a dielectric wall 245, and are separated into upper and lower portions. Since the X electrode 261 and the Y electrode 262 are separately disposed up and down and are buried by the dielectric wall 245 so as to maintain an insulating state therebetween, different voltages can be applied.

The dielectric wall 245 is positioned between the front substrate 210 and the partition wall 250, and the X electrode 261 and the Y electrode 362 are disposed upside down. The dielectric wall 245 partitions the discharge space S together with the front substrate 210, the rear substrate 220, and the partition 250.

The dielectric wall 245 is made of a dielectric material having a high dielectric constant mainly composed of a material, for example, frit glass, with the dielectric layer 241 of the back substrate 220. The dielectric wall 245 has a thickness and a height sufficient to fill the X electrode 261 and the Y electrode 262, which are sustain electrodes 260, and have substantially the same shape as the partition wall 250. (250) Located above.

The sustain electrode 260 is not disposed on the inner surfaces of the opposing front substrate 210 and the rear substrate 220 in the discharge space S, but is positioned at the upper end of the partition wall 250 so as to surround the discharge space S. It is arranged along. The X electrode 261 and the Y electrode 262 have the same shape and include a metal material having high conductivity. The X electrode 261 and the Y electrode 262 may be formed by, for example, a printing method, a sand blasting method, a deposition method, an etching method, and the like, and the X electrode 261 and the Y electrode 262 are both partition walls. It is preferable to arrange so as to be located above 205.

Although not shown in the drawing, the X electrode 261 and the Y electrode positioned in the discharge space S adjacent to the address electrode 230 in the X electrode 261 and the Y electrode 262, that is, in the X direction. 262 may be integrally connected to each other to have a ladder shape. In addition, the X electrode 261 and the Y electrode 262 positioned in the discharge space adjacent to the address electrode 230 in the X electrode 261 and the Y electrode 262, that is, in the X direction, respectively, are conductive connection members. It may have a shape that is integrally connected by.

In the exemplary embodiment of the present invention, the partition wall 250 is disposed on the back substrate 220, and the dielectric wall 245 is disposed on the partition wall 250, and the sustain electrode 260 is disposed on the dielectric wall 245. Although the structure in which the X electrode 261 and the Y electrode 262 are embedded is illustrated, the present invention is not limited thereto, and the dielectric wall 245 is disposed on the rear substrate without the partition wall 250 disposed on the rear substrate 220. The dielectric wall 245 may serve as the partition wall 250 by being formed between the 220 and the front substrate 210.

In addition, in the embodiment of the present invention, the X electrode 261 and the Y electrode 262, which are the sustain electrodes 260, form a closed loop discharge space S to be discharged by an AC voltage applied between the two electrodes. In order to prevent this from happening, the dielectric material 245 is buried in the upper part of the barrier rib 250, but the present invention is not limited thereto, and the X electrode 261 and the Y electrode 262 may be formed at the side in which the discharge space S is formed. As long as it can generate a discharge, it can be arrange | positioned in various forms, positions, etc.

At this time, the X electrode 261 and the Y electrode 262 is preferably disposed so that the discharge can be easily initiated and easily diffused even at a low voltage. In addition, the Y electrode 262 of the sustain electrode 260 is preferably disposed to be close to the address electrode 230 in order to lower the address voltage applied between the address electrode 230 and the Y electrode 262. Therefore, it is preferable that the Y electrode 262 of the X electrode 261 and the Y electrode 262 constituting the sustain electrode 260 be disposed closer to the rear substrate 220 where the address electrode 230 is disposed. .

In addition, in the exemplary embodiment of the present invention, the X electrode 261 and the Y electrode 261 are illustrated as having a ring shape, but the shape of the X electrode 261 and the Y electrode 261 are not necessarily limited thereto. Can have

In the discharge space S partitioned by the partition 250 and the dielectric wall 245, a phosphor layer 270 is excited by ultraviolet rays generated from the discharge gas and emits visible light. When the plasma display panel of the present invention implements a full color image, red, green, and blue phosphor layers 270 are applied to each discharge cell. In this case, Y (V, P) O4: Eu may be used as the red light emitting phosphor, and ZnSiO4: Mn, YbO3: Tb may be used as the green light emitting phosphor, and BAM: Eu may be used as the blue light emitting phosphor.

The phosphor layer 270 may be coated on any surface of the discharge space, but considering the transmittance of visible light emitted from the phosphor layer 270, the phosphor layer 270 is disposed under the dielectric wall 245 in which the sustain electrode 260 is formed. It is preferable to coat the inside of the partition wall 250. That is, as shown in the figure, it is preferable to be applied so as to cover the bottom surface and the lower side of the rear substrate 220 side of the discharge space (S).

A passivation layer 280 is formed on the inner surface of the dielectric wall 245 to protect the dielectric wall 245. The protective layer 280 is to prevent dielectric breakdown of the dielectric wall 245 and to increase secondary electron emission, and includes magnesium oxide (MgO).

In the discharge space S, a discharge gas including any one of neon, helium (He), or arcon (Ar) gas including 10% xenon (Xe) gas, or a mixed gas of two or more thereof is included. Is charged.

In addition, in the exemplary embodiment of the present invention, the front substrate 210 includes a groove 215 in a portion excluding the discharge space S, that is, in a non-discharge region. The groove 215 is formed by etching the inner surface of the front substrate 210 by a predetermined thickness and width. The groove 215 is formed to be disposed along the discharge space S in the non-discharge region.

In the exemplary embodiment of the present invention, the groove 215 is illustrated as having a lattice shape like the partition wall 250, but may have various shapes like the partition wall 250. Meanwhile, in the exemplary embodiment of the present invention, the groove 215 is illustrated as having the same shape as the partition wall 250, but unlike the partition wall 250, the stripe shape extends in the direction parallel to the address electrode 230, that is, in the Y direction. Alternatively, a groove 215 having a stripe shape extending in the direction crossing the address electrode 230, that is, the X direction may be disposed on the non-discharge area, for example, on the partition 250.

A filling film 290 made of a material having a high thermal conductivity for improving the thermal conductivity of the front substrate 210 is disposed in the groove 215 of the front substrate 210. The filling film 290 includes a non-oxide-based ceramic material such as silicon nitride and aluminum nitride having excellent thermal conductivity. Silicon nitride and aluminum nitride for the filling film 290 have a high thermal conductivity, and is a material resistant to heat and discharge by sputtering. Silicon nitride has a high thermal conductivity of about 120 to 150 W / mK, and aluminum Has a high thermal conductivity of approximately 150 to 200 W / mK.

The operation of the plasma display panel of the present invention having the configuration as described above is as follows.

First, when a predetermined address voltage is applied to the Y electrode 262 of the address electrode 230 and the sustain electrode 260 from an external power source, a corresponding discharge space among the plurality of discharge spaces S is selected, and the selected discharge is selected. Wall charges are accumulated on the Y electrode 262 in the space S.

Subsequently, when a positive voltage of a predetermined level is applied to the X electrode 261 and a voltage higher than the voltage applied to the X electrode is applied to the Y electrode 262, the voltage between the X electrode 261 and the Y electrode 262 is applied. The wall charges are moved by the car.

When the wall charges move in this way, they collide with discharge gas atoms in the discharge space S to generate a discharge to generate plasma. Such discharge is likely to occur from adjacent portions of the X electrode 261 and the Y electrode 262 where a relatively strong electric field is formed. Therefore, in the present invention, since the X electrode 261 and the Y electrode 262 are disposed along the side surface of the discharge space S, the possibility of discharge is greatly increased. As a result, the luminous efficiency is increased.

If the difference between the voltages applied to the X electrode 261 and the Y electrode 262 is kept large enough over time, the electric field formed between the two electrodes 261 and 262 is gradually concentrated. As a result, the discharge is diffused into the entire discharge space S. FIG.

After the discharge is formed in the manner as described above, when the voltage difference between the X electrode 261 and the Y electrode 262 is lower than the discharge voltage, the discharge no longer occurs, and the space charge and the wall charge are discharge space S. Is formed. At this time, when the polarities of the voltages applied to the X electrode 261 and the Y electrode 362 are changed, discharge occurs with the help of wall charges.

As such, when the polarities of the voltages applied to the X electrode 261 and the Y electrode 262 are changed, the first discharge process as described above is repeated, and the discharge is stably generated while repeating the above process.

The ultraviolet light generated by the discharge excites the fluorescent material of the phosphor layer 270 applied to each discharge space S to generate visible light, and the generated visible light is radiated into the discharge space S to obtain a desired image. Will be implemented.

Therefore, since the dielectric layer for embedding the sustain electrode and the sustain electrode on the inner surface of the discharge space S and the front substrate 210 and the protective film layer coated on the inner surface of the dielectric layer are not formed, the aperture ratio of the panel 200 is increased. And transmittance of visible light is improved.

In addition, by disposing the filling film 290 made of a non-oxide-based ceramic material having a thermal conductivity in the groove 215 formed on the inner surface of the front substrate 210, the temperature difference of the panel during the discharge is reduced.

As described above, according to the plasma display panel of the present invention, an electrode such as a sustain electrode is not formed on the inner surface, and a dielectric layer for covering the electrode and a protective film layer for protecting the dielectric layer are not formed. It is possible to improve the transmission efficiency of visible light.

In addition, the inner surface of the front substrate having low thermal conductivity is etched to form grooves, and then the material having high thermal conductivity is filled to improve the thermal conductivity of the front substrate, thereby preventing bright images from occurring due to the temperature difference of the panel during discharge. .

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (5)

A front substrate having a groove formed on an inner side thereof; A rear substrate disposed to face the front substrate; A dielectric wall disposed between the front substrate and the rear substrate and defining a discharge space together with the front substrate and the rear substrate; A sustain electrode disposed separately along the circumference of the discharge space and having X and Y electrodes embedded in the dielectric wall; An address electrode disposed on the rear substrate and buried by a dielectric layer; A phosphor coated in the discharge space; And a filling film made of a thermally conductive material disposed in the groove of the front substrate. The method of claim 1, And the groove is formed in a non-discharge region except for the discharge space corresponding to the dielectric wall. The method of claim 1, And the groove is formed in a non-discharge region except for the discharge space along at least one of a side-by-side direction along the address electrode or a direction crossing the address electrode. The method of claim 1, The filling film disposed in the groove is a plasma display panel comprising a non-oxide-based ceramic material. The method of claim 4, wherein The filling film disposed in the groove is selected from silicon nitride and aluminum nitride.

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