KR20000074476A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to improve a light emitting efficiency with a low discharge voltage by installing a sub electrode between common/scanning electrodes. CONSTITUTION: In feeding a pulse voltage between scanning/address electrodes(24,28), a wall electric charge is charged by generating a pre-discharge between the electrodes(24,28). A holding discharge occurs by feeding an AC of 180V in common/scanning electrodes(23,24) in the charged space. In occurring the holding discharge, plasma is formed in the charged space. A radiated ultraviolet ray excites a fluorescent layer(210) to embody an image. A sub electrode(220) is installed between common/scanning electrodes(23,24) to generate the holding discharge. In feeding the voltage between common/scanning electrodes(23,24), a sub discharge is generated between the sub electrode(220) and the common electrode(23) or the scanning electrode(24). Gases in the charged space are stimulated by generating a main discharge between two electrodes(23,24).

Description

Plasma display panel {Plasma display panel}

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which an auxiliary electrode is formed between a common electrode and a scan electrode on a front substrate.

In general, a plasma display panel injects and seals a discharge gas on two substrates coated with a plurality of electrodes, applies a discharge voltage, and excites a phosphor by ultraviolet rays generated by the discharge voltage. Refers to the device to implement.

Such a plasma display panel may be classified into a direct current type and an alternating current type according to a type of driving voltage applied to a discharge cell, for example, a discharge type, and may be classified into a counter discharge type and a surface discharge type according to the configuration of the electrodes.

In the DC plasma display panel, all electrodes are exposed to the discharge space, and charge transfer is directly performed between the corresponding electrodes, whereas in the AC plasma display panel, at least one electrode is embedded in the dielectric layer, and the corresponding electrode Instead of direct charge transfer between them, the discharge is performed by an electric field of wall charge.

In the opposite discharge type plasma display panel, an address electrode and a scan electrode are provided to each unit pixel so as to face each other, and an addressing discharge and sustaining method is provided between the two electrodes. An address electrode, a common electrode, and a scan electrode corresponding to each pixel are provided to generate addressing discharge and sustain discharge.

As shown in FIG. 1, the conventional surface discharge plasma display panel 10 is provided such that the front substrate 11 and the rear substrate 12 face each other. The common electrode 13 and the scan electrode 14 are alternately formed in a strip form on the lower surface of the front substrate 11. Bus electrodes 15 are formed on the lower surfaces of the common and scan electrodes 13 and 14 to reduce line resistance. A dielectric layer 16 is formed on the bottom surface of the front substrate 11 so that the electrodes 13, 14, 15 are embedded. A protective film 17, such as a magnesium oxide (MgO) film, may be further formed on the bottom surface of the dielectric layer 16.

On the other hand, the address electrode 18 is formed in a strip shape on the rear substrate 12 so as to intersect the common and scan electrodes 13 and 14. The address electrode 18 is buried by a dielectric layer 19 coated on the rear substrate 12, and on the dielectric layer 19, a barrier rib 100 having a strip shape in a direction parallel to the address electrode 18 is formed. The phosphor layer 110 of red, green, and blue is formed between the partition walls 100.

In the conventional plasma display panel 10 having the structure described above, a voltage is applied between the scan electrode 14 and the address electrode 18 so that a preliminary discharge occurs to charge the wall charge. In the discharge space filled with the wall charge, a voltage is applied between the common electrode 13 and the scan electrode 14 to generate a main discharge, thereby forming a plasma, and the ultraviolet rays emitted therefrom excite the phosphor layer 110. To realize the image.

In this case, the luminous efficiency is changed according to the interval between the common electrode 13 and the scan electrode 14. That is, as the interval between the common and scan electrodes 13 and 14 is wider, the aperture ratio of the plasma display panel 10 is improved, and as a result, the luminous efficiency is increased.

By the way, although the space | interval between the common and scan electrodes 13 and 14 is about 60-100 micrometers, it is advantageous to improve this luminous efficiency preferably by making this space | interval wider. Problems caused by the spacing adjustment include that the discharge voltages of the common and scan electrodes 13 and 14 increase. Therefore, it should be possible to improve the luminous efficiency and to generate a discharge even at a low discharge voltage.

In addition, as the area occupied by the two electrodes 13 and 14 in the discharge cells including the pair of common and scan electrodes 13 and 14 increases, power consumption due to leakage current increases. There is also a need to prevent it.

The present invention has been made to solve the above problems, and by providing a separate auxiliary electrode between the common electrode and the scan electrode of the front substrate, the structure is improved plasma display to improve the luminous efficiency even at low discharge voltage The purpose is to provide a panel.

1 is a partial ablation perspective view illustrating a conventional plasma display panel;

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

3 is a cross-sectional view showing a part of a plasma display panel according to a second embodiment of the present invention;

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

10,20,30 ... plasma display panel

11,21,31 ... front substrate 12,22,32 ... back substrate

13,23,33 ... common electrode 14,24,34 ... scan electrode

18,28,38 ... address electrode 220 ... secondary electrode

320 ... first auxiliary electrode 330 ... second auxiliary electrode

Plasma display panel according to an aspect of the present invention to achieve the above object, the front substrate; A plurality of common electrodes and scan electrodes alternately formed on the lower surface of the front substrate; An auxiliary electrode disposed between the two electrodes in a direction parallel to the common electrode and the scan electrode and to which a predetermined voltage is applied; A dielectric layer applied to a lower surface of the front substrate to fill the common electrode, the scan electrode, and the auxiliary electrode; A rear substrate disposed to face the front substrate; A plurality of address electrodes disposed on an upper surface of the rear substrate to intersect the common and scan electrodes; A partition wall disposed between the address spaces to partition a discharge space; And a phosphor layer applied in the discharge space partitioned by the partition wall.

In addition, the interval between the common electrode and the scan electrode is characterized in that more than 100 micrometers.

Here, the auxiliary electrode is characterized in that it is mutually energized with any one of the common electrode or the scan electrode.

In addition, the plurality of auxiliary electrodes may include a first auxiliary electrode which is energized with the common electrode, and a second electrode which is energized with the scan electrode.

Further, the auxiliary electrode is characterized in that the distance from the common electrode or the scan electrode causing the discharge is 50 micrometers or less.

Hereinafter, a plasma display panel according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 shows a plasma display panel 20 according to a first embodiment of the present invention.

Referring to the drawings, the plasma display panel 20 is provided with a front substrate 21 and a rear substrate 22 facing the front substrate 21. The common electrode 23 and the scan electrode 24 are alternately formed in a strip shape on the lower surface of the front substrate 21. A bus electrode 25 is formed on one side of the common and scan electrodes 23 and 24 to serve as an auxiliary electrode that prevents a voltage drop of the electrodes 23 and 24. The common and scan electrodes 23 and 24 and the bus electrode 25 are embedded by a dielectric layer 26 formed on the lower surface of the front substrate 21.

On the other hand, the upper surface of the back substrate 22 is formed in the form of a strip of address electrodes 28 that intersect the common and scan electrodes 23, 24. The address electrode 28 is buried by a dielectric layer 29 formed on the upper surface of the back substrate 22. On the top surface of the dielectric layer 29, the address electrodes 28 are formed in parallel with each other, and partition walls 200 defining a discharge space are provided, and red, green, and blue phosphor layers (between the partition walls 200) are formed. 210 is applied.

Here, the interval between the common electrode 23 and the scan electrode 24 is 100 micrometers or more. This spacing is wider than the spacing between the common and scan electrodes 13 and 14 according to the prior art, and has the advantage of improving the luminous efficiency of the discharge cells partitioned by the common and scan electrodes 23 and 24. Have

In addition, in order to prevent an increase in the discharge voltage generated as the interval between the common and scan electrodes 23 and 24 increases, an auxiliary electrode 220 is disposed between the two electrodes 23 and 24. It is provided in the direction parallel to (23) (24). The auxiliary electrode 220 is preferably a metal material.

The auxiliary electrode 220 may be connected to the ends of the common or scan electrodes 23 and 24 so as to be energized to each other, or to at least one of the ends and the center of the common or scan electrodes 23 and 24. It is connected to

In this case, the auxiliary electrode 220 is installed adjacent to any one of the common or scan electrodes 23 and 24 to generate an auxiliary discharge, which is one of the auxiliary electrode 220 and the two electrodes 23 and 24. It is desirable to keep the distance from one to 50 micrometers or less.

In addition, the auxiliary electrode 220 preferably has a minimum width so as to have a minimum effect on the opening ratio of the discharge cell. In this embodiment, the auxiliary electrode 220 has a width of 50 micrometers or less.

3 shows a plasma display panel 30 according to a second embodiment of the present invention.

Referring to the drawings, a plurality of common electrodes 33 and scan electrodes 34 are alternately formed on the lower surface of the front substrate 31, and bus electrodes 35 are disposed on one side of the lower surfaces of the common and scan electrodes 33 and 34. ) Is formed, and the electrodes 33, 34, 35 are embedded by the dielectric layer 36. A passivation layer 37 may be further formed on the bottom surface of the dielectric layer 36.

On the other hand, an address electrode 38 is formed on the upper surface of the rear substrate 32 opposite to the front substrate 31 so as to cross the common and scan electrodes 33 and 34, and the address electrode ( 38 is buried by the dielectric layer 39, and the barrier rib 300 is formed on the top surface of the dielectric layer 39 in a direction parallel to the address electrode 38. The phosphor layer 310 is formed between the barrier ribs 300.

Here, an auxiliary electrode is provided between the common and scan electrodes 33 and 34 as shown in FIG. 2, and in this embodiment, a plurality of auxiliary electrodes 320 and 330 are provided.

That is, the first auxiliary electrode 320, which is installed to be in electrical communication with the common electrode 33, is disposed at a position adjacent to the electrode 33, while the second auxiliary electrode is in electrical communication with the scan electrode 34. The auxiliary electrode 330 is provided adjacent to the scan electrode 34. Since the auxiliary electrodes 320 and 330 of this type are electrically connected to the common and scan electrodes 33 and 34, respectively, the auxiliary electrodes 320 and 330 may reduce the discharge voltage more effectively.

The operation of the plasma display panel according to the present invention having the structure as described above will be described with reference to FIG.

First, when a pulse voltage is applied between the scan electrode 24 and the address electrode 28, preliminary discharge occurs between the two electrodes 24 and 28 to charge the wall charge. Subsequently, an alternating voltage of approximately 180 volts (V) is applied to the common electrode 23 and the scan electrode 24 in the discharge space filled with the wall charge to generate sustain discharge.

When sustain discharge is generated, plasma is formed in the discharge space. As a result, the emitted ultraviolet rays excite the phosphor layer 210 to implement an image.

According to the present invention, an auxiliary electrode 220 is provided between the common and scan electrodes 23 and 24 to generate sustain discharge.

That is, when a voltage is applied between the common electrode 23 and the scan electrode 24, firstly, one of the auxiliary electrode 220, the common electrode 23, or the scan electrode 24 having a short distance between the electrodes is first. Auxiliary discharge occurs. Subsequently, a main discharge occurs between the auxiliary electrodes 220 and the two electrodes 23 and 24 having a larger distance than the common and scan electrodes 23 and 24 to excite the gases charged in the discharge space.

As such, the auxiliary electrode 220 is positioned in a discharge cell and is electrically connected to at least one of the common or scan electrodes 23 and 24, so that the adjacent common or scan electrodes 23 and 24 are preferentially adjacent to each other. And secondary discharge.

As described above, the plasma display panel of the present invention can obtain the following effects by providing an auxiliary electrode between a pair of common and scan electrodes constituting a discharge cell.

First, the gap between the common electrode and the scan electrode can be widened to improve the luminous efficiency.

Second, an increase in the discharge voltage due to the increase in the distance between the common and the scan electrodes can be prevented by preferentially causing a discharge in either the common or the scan electrodes and the auxiliary electrode, thereby reducing the discharge voltage.

Since the space between the set material, the common and the scan electrodes is wide, the area of the electrode is relatively reduced, thereby reducing power consumption due to leakage current.

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 (7)

Front substrate; A plurality of common electrodes and scan electrodes alternately formed on the lower surface of the front substrate; An auxiliary electrode disposed between the two electrodes in a direction parallel to the common electrode and the scan electrode and to which a predetermined voltage is applied; A dielectric layer applied to a lower surface of the front substrate to fill the common electrode, the scan electrode, and the auxiliary electrode; A rear substrate disposed to face the front substrate; A plurality of address electrodes disposed on an upper surface of the rear substrate to intersect the common and scan electrodes; A partition wall disposed between the address spaces to partition a discharge space; And And a phosphor layer applied in the discharge space partitioned by the partition wall. The method of claim 1, And a distance between the common electrode and the scan electrode is 100 micrometers or more. The method of claim 1, And the auxiliary electrode is electrically energized with any one of the common electrode and the scan electrode. The method of claim 2, The auxiliary electrode is a plurality, And a second auxiliary electrode which is energized with the common electrode, and a second auxiliary electrode which is energized with the scan electrode. The method according to claim 3 or 4, And the auxiliary electrode has a distance of 50 micrometers or less from the common electrode or the scan electrode causing the discharge. The method of claim 1, The auxiliary electrode is a plasma display panel, characterized in that the metal material. The method of claim 1, And the auxiliary electrode has a width of 50 micrometers or less.