KR20020062049A - A Plasma Display Panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to improve luminescence and emission efficiency and accomplish low power consumption with improved structure of MgO protection layer. CONSTITUTION: A plasma display panel comprises a pair of sustain electrodes, a dielectric layer, and a MgO protection layer. The MgO protection layer is partially removed between 1/4-2/4 portion of the width of the sustain electrode from the inner boundary of the pair of the sustain electrodes to directly expose the dielectric layer to discharge space. Because cathode electrode discharge spreading significantly depends on secondary electron emission due to collision of ion and the MgO protection layer, the removal of the MgO protection layer reduces cathode electrode discharge spreading. In spite of the removal of the MgO protection layer, anode electrode discharge spreading does not changed. The cathode electrode discharge spreading is stopped at the removed portion of the MgO protection layer, and then discharge path in the removed portion is lengthened.

Description

Plasma Display Panel {A Plasma Display Panel}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of improving the structure of an MgO protective layer to improve luminance, luminous efficiency, and low power consumption.

FIG. 1 is a view illustrating a schematic configuration of a general AC surface discharge plasma display panel, and includes a front glass substrate 20, an address electrode A ″ formed on the front glass substrate, and a rear glass substrate facing the front glass substrate ( 10) a pair of sustain electrodes (X (7), Y (8)) arranged parallel to each other on a back glass substrate, a dielectric layer 12 formed to cover the pair of sustain electrodes, and MgO protection on the dielectric layer 12 And a partition wall 21 disposed between the front glass substrate 20 and the rear glass substrate 10 to define a discharge space, wherein each of the sustain electrodes is a transparent ITO electrode Xa. And Ya) and bus electrodes Xb and Yb disposed at one end of the ITO electrode.

FIG. 2 is a diagram illustrating a sustain electrode, a dielectric layer, and an MgO protective layer of a conventional AC PDP. The top dielectric layer 12 covering the two sustain electrodes X (7) and Y (8) prevents damage due to ion collision. Covered by the MgO protective layer 13. Another role of the MgO protective layer 13 is to discharge secondary electrons during ion collision to cause and maintain a discharge. FIG. 3 shows that in the conventional AC PDP as shown in FIG. 2, the discharge spreads first to the sustain electrode (positive electrode), and the discharge spreads to the non- applied voltage (negative electrode) due to the movement of heavy ions. Giving. FIG. 4 shows the potential on the MgO protective layer at the same time in FIG. 3. When electrons having negative charges move to the outside of the positive electrode and accumulate wall charges, a voltage drop occurs, and the discharge is maintained by the potential difference (indicated by an ellipse in FIG. 4) between the portion where the voltage is dropped and the portion that is not dropped, Spread outwards. On the negative electrode side, the ions accumulate wall charges and the discharge spreads to the outside of the negative electrode.

Here, the discharge spread to the positive electrode and the discharge spread to the negative electrode have two big differences. One is that the spread of the discharge of the positive electrode is driven by a low potential difference (the part indicated by the right ellipse in (b) and (c) of Figure 4) as can be seen in the potential plot of Figure 4, but the spread of the discharge to the negative electrode is relatively This is driven by the strong potential difference (the part indicated by the left ellipse in FIG. 4 (C) and the ellipse in FIG. 4 (D)). Another difference is that the spread of discharge of the positive electrode is mainly caused by ionization by electron-neutral particle collision, whereas the negative electrode has almost no electrons distributed in space, so secondary electron emission due to collision of ion-MgO protective layer is discharged. It is the main factor of spread.

It can be seen from the above analysis that the conventional AC PDP discharge efficiency is greatly lowered by the negative electrode discharge driven by the strong electric field, and in order to solve this problem, the discharge spreading efficiency at the negative electrode must be increased.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problem, and to provide a plasma display panel capable of improving the structure of the MgO protective layer to improve luminance, luminous efficiency, and low power consumption.

1 is a diagram showing a schematic configuration of a typical AC surface discharge PDP;

2 is a view partially showing a cell structure of a conventional three-electrode surface discharge PDP;

3 is a view showing discharge progress in a cell structure of a conventional three-electrode surface discharge PDP;

4 is a view showing a potential shift at a protective film position according to discharge in FIG. 3;

5 is a view showing a structure partially removed MgO protective film according to the present invention,

6 is a view showing the discharge progress in the structure partially removed the MgO protective film according to the present invention,

FIG. 7 is a diagram showing a potential shift at a protective film position according to discharge in FIG. 5, and

8 is a view showing a comparison of power consumption, light quantity, and efficiency of a conventional PDP and a PDP according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: back glass substrate 12: dielectric layer

13: MgO protective layer 20: front glass substrate

21: bulkhead 24: phosphor

A ": address electrode X (7), Y (8): sustain electrode pair

Technical solution of the present invention for achieving the above object is a pair of substrates arranged at regular intervals, a plurality of address electrodes formed on the one substrate, and the other substrate formed in a predetermined width to cross the address electrode A plasma layer including a plurality of sustain electrode pairs, a dielectric layer formed to cover the plurality of sustain electrodes on the other substrate, a passivation layer formed on the dielectric layer and exposed to a discharge space, and discharge cells formed at an intersection of the address electrode and the sustain electrode pair. In the display panel, the passivation layer is formed so that the dielectric layer is at least partially directly exposed to the discharge space in each discharge cell, thereby reducing the negative electrode discharge.

In the discharge cell, the exposed portion of the dielectric layer is preferably a portion between 1/4 and 2/4 of the width of each sustain electrode at the inner boundary of the facing sustain electrode pair.

Hereinafter, embodiments of the present invention according to the above configuration will be described with reference to the accompanying drawings.

5 shows the structure of the sustain electrode pair (X (7), Y (8)), the dielectric layer 12, and the MgO protective layer 13 according to the present invention, and the width of each sustain electrode at the inner boundary of the sustain electrode pair. The dielectric layer 12 is directly exposed to the discharge space by removing the MgO protective layer at a portion between 1/4 and 2/4 of the. Since the negative electrode discharge spreading is highly dependent on the secondary electron emission due to the collision of the ion-MgO protective layer, the portion of the MgO protective layer may be removed to prevent secondary electron emission, thereby reducing the negative electrode discharge spreading.

Figure 6 shows the discharge spread phenomenon in the present invention by numerical analysis. Since the discharge spread to the positive electrode does not depend on the secondary electrons, it can be seen that the process proceeds almost similar to the conventional AC PDP without the MgO protective film. The big difference is in the spread of discharge to the negative electrode. In the conventional AC PDP, as shown in FIG. 2, the spread of discharge is continuously shown. In the present invention, the spread of the negative electrode discharge stops at the portion where the MgO protective layer is removed (FIG. 6 (C)), and the MgO protection. A discharge spreads by skipping over the part without a layer (FIG. 6 (d), (e)).

This type of discharge spreading affects the discharge efficiency in three ways. First, the power consumption is reduced by reducing the discharge depending on the secondary electrons, and second, the long path discharge is generated at the negative electrode as shown in FIG. The longer the discharge path is, the larger the proportion of the low electric field is, which produces more particles in the excited state than the ions, so that the luminance can be maintained. Third, the longer the discharge path, the closer the plasma distribution is to the phosphor 24 on the lower plate, so that the VUV-visible light conversion is higher.

Visible light generated in AC PDP is generated when the VUV generated during excitation of xenon reaches the phosphor and is converted into visible light. The closer the phosphor is, the higher the VUV-visible light conversion.

As a result of the above three effects, power consumption can be reduced without decreasing luminance, thereby increasing the overall luminous efficiency.

FIG. 7 shows the potential on the MgO protective layer at the same time of FIG. 6. The aspect of the positive electrode is similar to that of the conventional AC PDP, and in the negative electrode, the wall charges are accumulated in the portion without the MgO protective layer, so that the voltage rise due to the wall charges is partially reduced (from (e) in FIG. 7) to an ellipse. Indicated portion) to prevent the spread of continuous discharge.

FIG. 8 compares the conventional AC PDP with power consumption, luminance, and luminous efficiency of the present invention according to the driving voltage. Data represented by a triangle (▲) is for the conventional AC PDP, and an inverted triangle (▼). Marked with respect to the present invention. According to FIG. 8, it can be seen that the present invention has almost no change in luminance compared with the related art, while the power consumption is small, thereby improving the overall luminous efficiency by about 30%.

Therefore, according to the present invention, the power consumption is reduced by removing a part of the MgO protective layer corresponding to a part of the sustain electrode pair, thereby reducing the discharge depending on the secondary electrons, and by generating a long path discharge at the negative electrode. The decrease in the luminance due to the negative electrode discharge is prevented, and the longer the discharge path is, the closer the plasma distribution is to the phosphor 24 in the lower plate, thereby increasing the VUV-visible light conversion.

Although the present invention has been described in detail as the embodiments described above, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, and such modifications and modifications belong to the appended claims.

Claims (2)

A pair of substrates arranged at regular intervals, a plurality of address electrodes formed on the one substrate, a plurality of pairs of sustain electrodes formed on a predetermined width to intersect the address electrodes on another substrate, and a plurality of sustain electrodes on the other substrate A plasma display panel comprising a dielectric layer formed to cover, a protective film formed on the dielectric layer and exposed to a discharge space, and discharge cells formed at intersections of the address electrode and the sustain electrode pair. And the protective film is formed so that the dielectric layer is at least partially directly exposed to the discharge space in each discharge cell, thereby lowering the negative electrode discharge. The method of claim 1, And a portion of the discharge cell in which the dielectric layer is exposed is a portion that is between 1/4 and 2/4 of the width of each of the sustain electrodes at the inner boundary of the facing sustain electrode pair.