KR20050122537A - Plasma display panel - Google Patents

Abstract

The present invention provides a high-efficiency plasma display panel capable of low-voltage discharge by lowering the discharge start voltage and the discharge voltage, and provides a plasma display panel which can avoid shortening the life even when the amount of ions colliding with the protective layer is increased. In order to achieve this object, a front substrate made of a transparent body, a sustain discharge electrode pair having an X electrode and a Y electrode provided under the front substrate, a front dielectric layer covering the sustain discharge electrode pair, and At least one electric field concentrator formed between the pair of sustain discharge electrodes, at least one discharge path enlargement portion formed on the front dielectric layer, a protective film layer formed on the front dielectric layer and the discharge path enlargement portion, and the front substrate. A rear substrate disposed in parallel toward the rear substrate An address electrode formed on the substrate, a back dielectric layer covering the address electrode, a partition wall formed between the front substrate and the back substrate and partitioning a discharge cell, a phosphor layer formed on a wall surface of the discharge cell, and a discharge injected into the discharge cell. A plasma display panel including a gas is provided.

Description

Plasma display panel {Plasma display panel}

The present invention relates to a plasma display panel (PDP) of the present invention, and more particularly, low voltage discharge is possible, the discharge path is lengthened to uniform the wall charge distribution in the discharge cell, and to lower the discharge start voltage. The present invention relates to a plasma display panel.

1 is a perspective view of a conventional plasma display panel used in a plasma display device.

As shown in FIG. 1, the conventional plasma display panel is made by bonding the front panel 1 and the rear panel 2 to each other.

The front panel 1 includes a front substrate 60, a sustain discharge electrode pair 70 having a Y electrode 72 and an X electrode 71 formed on a bottom surface of the front substrate 60, and the sustain discharge electrode. An upper dielectric layer 80 covering the pair 70. The upper dielectric layer 80 is covered by a protective film layer 90 which is usually formed of MgO.

The rear panel 2 includes a rear substrate 10, address electrodes 20 formed on an upper surface of the rear substrate 10 to intersect the pair of sustain discharge electrodes 82, and the address electrodes 20. Formed on the lower dielectric layer 30 that covers the lower dielectric layer 30, the barrier rib 40 defining the discharge cell together with the sustain discharge electrode pair 82, and the side wall of the barrier rib and the upper surface of the lower dielectric layer 30. The phosphor layer 50 is provided.

The sustain discharge electrode pair 70 may be composed of an X electrode 71 and a Y electrode 72 each composed of a transparent electrode and a bus electrode. When a long gap electrode structure in which the distance between the X electrode 71 and the Y electrode 72 is 200 mu m or more is applied to the plasma display panel having such a configuration, the discharge start voltage and the discharge voltage become high and the discharge is performed. The problem of low efficiency arises. In addition, when a high concentration of Xe gas of 10% by volume or more is applied to increase the discharge efficiency, the ionization and excitation of atoms increase the generation of charged particles and excitation species, thereby increasing the luminance and discharge efficiency, but increasing the concentration of Xe gas. The reason is that the discharge voltage tends to be high, and therefore, the necessity of developing a plasma display panel capable of lowering the discharge start voltage has emerged. In addition, as the high concentration of Xe gas is applied, the amount of ions colliding with the protective film layer 90 increases, and in this case, there is a need for a method for preventing the life of the plasma display panel from being shortened.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a high-efficiency plasma display panel capable of low voltage discharge by lowering the discharge start voltage and the discharge voltage. Another object of the present invention is to provide a plasma display panel which can avoid shortening the life even when the amount of ions colliding with the protective film layer increases.

In order to achieve the above object, a front substrate made of a transparent body, a sustain discharge electrode pair having an X electrode and a Y electrode provided below the front substrate, a front dielectric layer covering the sustain discharge electrode pair, the sustain discharge electrode pair At least one electric field concentrator formed therebetween, at least one discharge path enlarger formed on the front dielectric layer, a passivation layer formed on the front dielectric layer and the discharge path enlarged portion, and disposed in parallel to the front substrate A rear substrate, an address electrode formed on the rear substrate, a back dielectric layer covering the address electrode, a partition wall formed between the front substrate and the back substrate, partitioning a discharge cell, a phosphor layer formed on a wall surface of the discharge cell, and The plasma display panel including the discharge gas injected into the discharge cell is made. Ball.

Here, the X electrode and the Y electrode are each provided with a transparent electrode and a bus electrode, the bus electrode is preferably disposed adjacent to the electric field concentrator on the bottom of the transparent electrode.

Here, the electric field concentrator is formed in the discharge space between the X electrode and the Y electrode, the thickness of the front dielectric layer is preferably formed thinner than other portions.

Here, the electric field concentrator is preferably a groove formed in the front dielectric layer between the X electrode and the Y electrode.

Here, the groove may be continuously formed in the longitudinal direction along the partition wall, or may be formed intermittently in the longitudinal direction along the partition wall.

Here, the discharge path enlarged portion is preferably formed on the surface of the front dielectric layer corresponding to the sustain discharge electrode pair.

Here, the discharge path enlarged portion may be a floating electrode to which no potential is applied, and may be formed of carbon nanotubes.

Here, it is preferable that the said discharge gas contains 10 volume% or more of Xe gas.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. For the same member as the member described in the prior art, the same member number is used in describing the embodiment of the present invention below.

FIG. 2 is a perspective view of the plasma display panel according to the present invention, and FIG. 3 is a side view viewed from the direction III of FIG. 2.

2 and 3, the plasma display panel 100 according to the present invention includes a back substrate 10, an address electrode 20, a back dielectric layer 30, a partition wall 40, and a phosphor layer 50. ), The front substrate 60, the sustain discharge electrode pairs 170, the front dielectric layer 180, the electric field concentrator 185, the discharge path enlarger 175, the passivation layer 190, and the discharge gas.

The back substrate 10 is disposed parallel to the front substrate 60, and functions to support the address electrodes 20 and the back dielectric layer 30, and is typically formed of glass as a main material.

The address electrode 20 extends in the longitudinal direction over the discharge cells partitioned by the partition wall 40. The address electrodes 20 are for generating an address discharge to facilitate a discharge between the sustain discharge electrode pairs 170, and serve to lower a voltage (discharge starting voltage) for discharging. The address discharge is a discharge occurring between the Y electrode 172 and the address electrode 20. When the address discharge is completed, cations accumulate on the Y electrode side and electrons accumulate on the X electrode side. It becomes easier.

The back dielectric layer 30 covers the address electrodes 20, and functions to prevent cations or electrons from colliding with the address electrodes 20 and damaging the address electrodes 20 during discharge. It is formed as a dielectric capable of inducing charge onto the phase. Such dielectrics include PbO, B ₂ O ₃ , SiO _2, and the like.

The partition wall 40 is disposed between the front substrate 60 and the rear substrate 10 to partition discharge cells, which are areas in which the phosphor layers 50 are formed. In the stripe-shaped partition wall as shown in FIGS. 2 and 3, the discharge cell is not partitioned by the partition wall 40 alone, and more precisely, the discharge cell is the partition wall 40 and the sustain discharge electrode. Partitioned by pair 170. The partition 40 functions to prevent erroneous discharges from occurring between the discharge cells 50. In FIG. 2, the partition wall 40 is formed in a stripe shape, but is not limited thereto. The partition wall 40 may be formed in a matrix, honeycomb, or other polygonal shape.

The address electrodes 20 may be disposed on an upper surface of the rear substrate 10, and the partition 40 may be disposed on the rear dielectric layer 30.

The front substrate 60 is made of a transparent material such as glass and made to transmit visible light.

The upper dielectric layer 180 prevents the adjacent X electrode 171 and the Y electrode 172 from directly conducting electricity during kitchen discharge, and cations or electrons in the discharge cell directly collide with the X electrode 171 and the Y electrode 172. To prevent damaging them. Accordingly, the upper dielectric layer 180 is formed as a dielectric having good light transmittance by inducing charge on the surface thereof and having good light transmittance. Such dielectrics include PbO, B ₂ O ₃ , and SiO ₂ . .

The electric field concentrator 185 is formed in a discharge space between the X electrode and the Y electrode, and may have a shape of a groove having a thickness of the front dielectric layer 180 thinner than other portions. The electric field concentrator 185 may be continuously formed along the length direction of the sustain discharge electrode pair 170, or may be discontinuously provided in plurality. In addition, the electric field concentrator 185 may be formed on the X electrode 171 and the Y electrode 172 instead of the discharge space between the X electrode 171 and the Y electrode 172. Instead of forming the front dielectric layer 180, the front dielectric layer 180 may be directly exposed to the surface of the front substrate 60. That is, the structure of which the electric field can be concentrated by making the thickness of the front dielectric layer 180 relatively thinner than other regions is not limited to the illustrated structure.

On the other hand, the electric field concentrator 185 is formed between the sustain discharge electrode pairs 170 for dividing one discharge cell, and the X electrode 173 of another discharge cell adjacent to the Y electrode 172. It is not formed between and.

Thus, the electric field concentrator 185 formed thinner than the thickness of the front dielectric layer 180 in another region is formed, thereby ionizing gas atoms with a stronger electric field effect in the discharge space between the X electrode 171 and the Y electrode 172. You can be active here. That is, in a short discharge space, discharge is started first to lower the discharge voltage. In a large discharge space, the discharge initial voltage of low voltage is generated by the generation of charged particles and excitation species concentrated around the sustain electrode during discharge. This makes it possible to improve the discharge efficiency.

The X electrode 171 and the Y electrode 172 have transparent electrodes 171a and 172a and bus electrodes 171b and 172b, respectively, and the bus electrodes 171b and 172b are the transparent electrodes 171a and 172a, respectively. Is placed on the bottom of the. In this case, the bus electrodes 171b and 172b are disposed close to the electric field concentrator 185 to be adjacent to each other. By thus placing the bus electrodes 171b and 172b close to each other, even in a long gap electrode structure in which the distance between the transparent electrodes 171a and 172a becomes 200 µm or more, ionization of gas atoms and the like can be performed with a strong electric field effect. It becomes active and, as a result, it is possible to lower the discharge start voltage.

The passivation layer 190 is covered by the upper dielectric layer 180, and functions to prevent cations and electrons from colliding with the upper dielectric layer 180 when being discharged, thereby damaging the upper dielectric layer 180. The passivation layer 190 is preferably formed of a material having good light transmittance to allow visible light to pass therethrough and capable of emitting a large amount of secondary electrons during discharge. Typically, MgO is used as the material of the protective film layer 190.

When the upper dielectric layer 180 itself is formed of MgO, the same effect can be obtained without the protective layer 190. However, in this case, the discharge path enlarger 175 may be preferably covered by the upper dielectric layer 180.

The phosphor layer 50 is disposed in a discharge cell partitioned by the partition wall 40, and is preferably formed over the entire side surface of the partition wall 40 and the top surface of the back dielectric layer 30. The sustain discharge electrode pairs 170 include an X electrode 171 and a Y electrode 172 extending laterally and are covered by the upper dielectric layer 180.

The discharge gas is mainly encapsulated in the discharge cell as a Ne-Xe mixed gas. The discharge gas may be a high concentration Xe gas containing 10% by volume or more of Xe gas. In this case, the ionization and excitation reaction of the gas atoms increase the generation of charged particles and excitation species, thereby increasing the brightness and efficiency, but tending to increase the discharge voltage.

In order to prevent the tendency of the discharge voltage to increase as the high concentration of Xe gas is applied, the discharge path expanding unit 175 is formed. The discharge path expanding unit 175 is formed on a surface of the front dielectric layer 180 corresponding to the sustain discharge electrode pair 170. That is, as shown in FIG. 3, the bus electrode is disposed below the transparent electrode.

The discharge path expanding unit 175 is made of a carbon-based material such as carbon nanotube (CNT) or fullerene having excellent secondary electron emission characteristics and sputtering characteristics.

Among these, the discharge path expansion unit 175 made of carbon nanotubes has a maximum current transport of 1 × 10 ⁹ A / cm ² , and is superior to metal materials such as copper or aluminum, and has excellent tensile strength, temperature stability, and heat transfer characteristics. In addition, the discharge path expanding unit 175 exhibits a quantum behavior, and the electron transport through the surface is not subjected to any resistance, and tends to move along the orbit. Positive electrons can be moved. The discharge path expanding unit 175 is a floating electrode to which no potential is applied.

By forming the discharge path expanding unit 175 as described above, the discharge path is long, so that the wall charge distribution inside the discharge cell is uniform. As a result, the impact of the ions on the protective film layer 190 is made uniform to extend the life of the plasma display panel.

The position at which the discharge path enlargement unit is installed is not limited to that shown in FIG. 3, and may be located in the non-discharge area farther from the electric field concentrator 185 than the position where the bus electrodes 171b and 172b are disposed.

The discharge path expanding unit 175 formed of the carbon nanotubes as described above may be formed by a printing method using a carbon nanotube raw material or may be formed by a deposition method. The electric field concentrator 185 can be formed by a printing method, a molding method, a sand blasting method, or an etching method.

Looking at the operation of the plasma display panel 100 according to an embodiment of the present invention having the configuration as described above are as follows.

First, when a predetermined pulse voltage is applied to the Y electrode 172 and the address electrode 20, address discharge occurs between them to form wall charges on the inner surface of the discharge space. At this time, the generated wall charge is charged in the electric field concentrator 185 formed in the discharge space between the X electrode 171 and the Y electrode 172.

In this state, when a voltage is applied to the X electrode 171 and the Y electrode 172, sustain discharge occurs between them. The discharge start voltage for the sustain discharge can be lowered by the electric field concentrator 185 and the electric charges charged therein.

In particular, the discharge path expansion unit formed near the X electrode 171 and the Y electrode 172 that a high concentration discharge gas is injected to increase the discharge start voltage by about 10% by volume for high efficiency discharge in the discharge space ( 175 can be compensated.

That is, the formation of the discharge path enlarger 175 made of carbon nanotubes increases the discharge path so that the electric field distribution is concentrated in the kitchen space, thereby uniformly distributing the wall charge in the discharge cell, The impact of ions is made uniform to improve the life of the panel.

According to the present invention as described above, the sustain discharge electrode pair is composed of the X electrode and the Y electrode, each of the X electrode and the Y electrode is provided with a transparent electrode and a bus electrode, respectively, the interval between the transparent electrode is 200㎛ or more Even in a long gap electrode structure, the bus electrodes are disposed adjacent to the electric field concentrators so as to be close to each other, thereby actively energizing ionization of gas atoms with a strong electric field effect, and consequently lowering the discharge start voltage. Will be.

Further, by forming an electric field concentrator formed thinner than the thickness of the front dielectric layer in another region, ionization excitation of gas atoms can be actively activated with a stronger electric field effect in the discharge space between the X electrode and the Y electrode. That is, in a short discharge space, discharge is started first to lower the discharge voltage. In a large discharge space, the discharge initial voltage of low voltage is generated by the generation of charged particles and excitation species concentrated around the sustain electrode during discharge. This makes it possible to improve the discharge efficiency.

In addition, by forming a discharge path enlarged part made of carbon nanotubes, the discharge path is long, and the electric field distribution concentrated in the kitchen space uniforms the wall charge distribution inside the discharge cell, thereby uniformly colliding with ions in the protective film layer. This improves the life of the panel.

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

1 is a partially exploded perspective view illustrating an example of a conventional plasma display panel;

2 is a partially exploded perspective view illustrating a plasma display panel according to the present invention.

3 is a side view as viewed from the direction III of FIG.

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

1, 100: plasma display panel

10: back substrate 20: address electrode

30 back dielectric layer 40 partition wall

50: phosphor layer 60: front substrate

70: sustain discharge electrode pair 71, 171, 173: X electrode

72, 172: Y electrode 80, 180: front dielectric layer

90, 190: passivation layer 171a, 172a: transparent electrode

171b and 172b: bus electrode 175: discharge path expanding portion

185: field concentrator

Claims (10)

A front substrate made of a transparent body; A sustain discharge electrode pair having an X electrode and a Y electrode disposed under the front substrate; A front dielectric layer covering the sustain discharge electrode pair; At least one electric field concentrator formed between the sustain discharge electrode pairs; At least one discharge path enlargement portion formed on the front dielectric layer; A passivation layer formed on the front dielectric layer and the discharge path expanding portion; A rear substrate disposed in parallel to the front substrate; An address electrode formed on the rear substrate; A back dielectric layer covering the address electrode; A partition wall formed between the front substrate and the rear substrate and partitioning a discharge cell; A phosphor layer formed on the wall surface of the discharge cell; And And a discharge gas injected into the discharge cell. The method of claim 1, And the X and Y electrodes each include a transparent electrode and a bus electrode, and the bus electrode is disposed adjacent to the electric field concentrator on a bottom surface of the transparent electrode. The method of claim 1, And the field concentrator is formed in a discharge space between the X electrode and the Y electrode, and the thickness of the front dielectric layer is thinner than that of other portions. The method of claim 3, wherein And the field concentrator is a groove formed in the front dielectric layer between the X electrode and the Y electrode. The method of claim 4, wherein And the groove is formed between each pair of the X and Y electrodes. The method of claim 4, wherein And the groove is intermittently formed only in part between the paired X and Y electrodes. The method of claim 1, And the discharge path expanding portion is formed on a surface of the front dielectric layer corresponding to the sustain discharge electrode pair. The method of claim 7, wherein And the discharge path expanding portion is a floating electrode to which a potential is not applied. The method of claim 1, And the discharge path expanding portion is formed of carbon nanotubes. The method of claim 1, And the discharge gas comprises 10% by volume or more of Xe gas.