KR100456139B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel capable of improving luminous efficiency and luminance.

The present invention includes a first sustain electrode pair alternately supplied with a first sustain voltage to cause sustain discharge, and a sustain electrode disposed on both sides of the first sustain electrode pair, the second sustain voltage being higher than the first sustain voltage. And a second sustain electrode pair supplied with a sustain voltage to extend the sustain discharge path, wherein the first sustain electrode pair and the second sustain electrode pair are stepped.

By such a configuration, the present invention improves the luminous efficiency by increasing the discharge path and the discharge area. In addition, the production cost is reduced by not using a transparent electrode.

Description

Plasma Display Panel {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 luminous efficiency and luminance.

Plasma Display Panel (hereinafter referred to as "PDP") is a display device using visible light generated from a phosphor when vacuum ultraviolet rays generated by gas discharge excite the phosphor.

PDP is thinner and lighter than Cathode Ray Tube (CRT), which has been the mainstay of display means, and has the advantage of being able to realize high definition large screen. PDP is composed of a plurality of discharge cells arranged in a matrix form, one discharge cell constitutes a pixel of the screen.

1A and 1B are diagrams showing the discharge cell structure of a conventional three-electrode AC surface discharge type PDP.

1A and 1B, a discharge cell of a conventional three-electrode AC surface discharge type PDP includes a scan / sustain electrode 12Y and a common sustain electrode 12Z formed on an upper substrate 10, and a lower substrate 18. Is provided on the address electrode 20X.

The scan / sustain electrode 12Y and the common sustain electrode 12Z are made of transparent electrodes and formed side by side on the upper substrate 10. Each of the scan / sustain electrode 12Y and the common sustain electrode 12Z has bus electrodes 13Y and 13Z having high electrical conductivity, respectively. The bus electrodes 13Y and 13Z serve to stably supply a constant voltage to the panel by using a material having high electrical conductivity.

The material used for the bus electrodes 13Y and 13Z generally has an opaque material that cannot transmit visible light. On the other hand, the material used as the scan / sustain electrode 12Y and the common sustain electrode 12Z uses a material that can transmit visible light well, and generally has a higher electrical conductivity than the material used for the bus electrodes 13Y and 13Z. Somewhat falling

As described above, the upper dielectric layer 14 and the passivation layer 16 are stacked on the scan / sustain electrode 12Y and the common sustain electrode 12Z formed with the bus electrodes 13Y and 13Z, respectively. In the upper dielectric layer 14, wall charges generated during plasma discharge are accumulated.

The protective layer 16 prevents the ions generated during the plasma discharge from damaging the upper dielectric layer 14 and increases the discharge efficiency of the secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used.

The lower dielectric layer 22 and the partition wall 24 are formed on the lower substrate 18 on which the address electrode 20X is formed, and the phosphor layer 26 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24. The address electrode 20X is formed in the direction crossing the scan / sustain electrode 12Y and the common sustain electrode 12Z.

The partition wall 24 is formed in parallel with the address electrode 20X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert gas for gas discharge is injected into the discharge space provided between the upper substrate 10 / lower substrate 18 and the partition wall 24.

The AC surface discharge type PDP is driven by dividing one frame into several subfields having different discharge times in order to express gray levels of an image. Each subfield is further divided into a reset period for uniformly causing discharge, an address period for selecting a discharge cell, and a sustain period for expressing gray scale according to the number of discharges. For example, when the image is to be displayed with 256 gray levels, the frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields. Each of the eight subfields is further divided into an address period and a sustain period. Here, the reset period and the address period of each subfield are the same for each subfield, while the sustain period is 2 ⁿ (n = 0,1,2,3,4,5,6,7) in each subfield. Is increased. In this way, since the sustain period is different in each subfield, the gray level of the image can be expressed.

Here, in the reset period, a reset pulse is supplied to the common sustain electrode 12Z to cause reset discharge. In the address period, scan pulses are supplied to the scan / sustain electrodes 12Y, and data pulses are supplied to the address electrodes 20X to generate address discharges between the two electrodes 12Y and 20X. During the address discharge, wall charges are formed in the upper and lower dielectric layers 14 and 22. In the sustain period, sustain discharge occurs between the two electrodes 12Y and 12Z by a pulse signal alternately supplied to the scan / sustain electrode 12Y and the common sustain electrode 12Z as shown in FIG.

In detail, when a pulse signal is supplied to the scan / sustain electrode 12Y and the common sustain electrode 12Z, a sustain discharge occurs while the scan / sustain electrode 12Y and the common sustain electrode 12Z repeat the cathode and the anode. do. At this time, since the scan / sustain electrode 12Y and the common sustain electrode 12Z are formed at the center of the discharge cell at narrow intervals, the utilization of the discharge space is low.

In other words, the sustain discharge is generated between the scan / sustain electrode 12Y and the common sustain electrode 12Z that are formed adjacent to each other, and the plasma generated by the sustain discharge is horizontally along the electrodes 12Y and 12Z. Is formed. That is, since discharge occurs between the electrodes 12Y and 12Z that are formed adjacent to each other, the discharge path is shortened, and thus the discharge area is reduced, thereby reducing the discharge efficiency.

In order to solve such a problem, as shown in Figs. 3a and 3b, the electrode shape of the conventional AC surface discharge type PDP cell is changed.

3A and 3B, the discharge cells of another conventional PDP cell are transparent used as the scan / sustain electrode 12Y and the common sustain electrode 12Z in the discharge cells of the conventional PDP shown in FIG. 1. Instead of the electrodes, first to third scan / sustain electrodes Y1, Y2 and Y3 and first to third common sustain electrodes Z1, Y2 and Y3 are formed using only bus electrodes having high electrical conductivity.

That is, a plurality of narrow first to third scan / sustain bus electrodes Y1 having a fence shape serving as a scan / sustain electrode 12Y and a common sustain electrode 12Z having a large area in the related art. , Y2 and Y3 and the first to third common sustain bus electrodes Z1, Y2 and Y3 are replaced.

Such a discharge cell of another conventional PDP is supplied with a driving pulse as shown in FIG.

In detail, when the pulse signal Vsus is supplied to the first to third scan / sustain bus electrodes Y1, Y2 and Y3 and the first to third common sustain bus electrodes Z1, Z2 and Z3. Sustain discharge occurs while the first to third scan / sustain bus electrodes Y1, Y2 and Y3 and the first to third common sustain bus electrodes Z1, Z2 and Z3 repeat the cathode and the anode.

The primary discharge is generated between the first scan / sustain bus electrode Y1 and the first common sustain bus electrode Z1 which are formed adjacent to each other. As such, when the primary discharge occurs, charged particles are generated, and the secondary discharge is induced between the second scan / sustain bus electrode Y2 and the second common sustain bus electrode Z2 by the priming effect of the generated charged particles. . In addition, a third discharge is induced between the third scan / sustain bus electrode Y3 and the third common sustain bus electrode Z3 by the priming effect of the charged particles generated by the secondary discharge.

4A and 3B, light emission efficiencies are compared with light emission efficiencies of a conventional surface discharge type PDP for two cases of a PDP cell having a bus electrode having a fence shape as shown in FIGS. 3A and 3B.

Referring to FIG. 4, in the conventional PDP, the interval between the scan / sustain electrode 12Y and the common sustain electrode 12Z is 60 μm, and the width of each scan / sustain electrode 12Y and the common sustain electrode 12Z is It is 380 micrometers, and the distance to the edge part of each electrode and the boundary of a cell is 220 micrometers. In the first PDP having a general fence structure, each bus electrode (Y, Z) has a width of 60 µm and a distance between each bus electrode (Y, Z) is 100 µm. In addition, the second PDP having the fence structure has a width of only 60 mu m for the bus electrodes Y1 and Z1, and the width of the remaining bus electrodes Y2, Y3, Z2 and Z3 has a width of 40 mu m. The distance between the bus electrodes Y and Z is 120 탆. The distance between the end portions of the bus electrodes Y and Z located outside the cell and the boundary of the cell is 220 占 퐉 as in the conventional PDP.

As shown in FIG. 4, when comparing the luminous efficiency of the conventional PDP and the first and second PDPs having a general fence structure, there is no significant difference. Rather, since the discharge of the plasma in the general fence PDP is less active than that of the conventional PDP, light emission occurs. No improvement in efficiency can be expected.

Accordingly, an object of the present invention is to provide a plasma display panel capable of improving luminous efficiency and luminance.

1A is a cross-sectional view showing a conventional AC surface discharge PDP cell.

1B is a plan view showing a conventional AC surface discharge PDP cell.

FIG. 2 is a waveform diagram showing driving waveforms applied to the address electrode and sustain electrode pairs shown in FIGS. 1A and 1B;

3A is a cross-sectional view showing a conventional fence structure PDP cell in which a sustain electrode pair is formed only of a bus electrode;

3B is a plan view showing a conventional fence structure PDP cell in which a sustain electrode pair is formed only of a bus electrode;

4 is a graph comparing luminous efficiency of the PDP cells shown in FIGS. 1A and 1B and the PDP cells shown in FIG. 3.

5A is a cross-sectional view illustrating a PDP cell having a fence structure according to an embodiment of the present invention in which a sustain electrode pair is formed only of a bus electrode;

5B is a plan view illustrating a PDP cell having a fence structure according to an embodiment of the present invention in which a sustain electrode pair is formed using only a bus electrode;

FIG. 6 is a waveform diagram showing driving waveforms applied to the address electrode and sustain electrode pairs shown in FIGS. 5A and 5B;

7 is a graph comparing luminous efficiency of PDP cells according to the first to third embodiments of the present invention and conventional PDP cells.

8 is a graph comparing power consumption of PDP cells according to the first to third embodiments of the present invention and conventional PDP cells.

10 is a graph comparing luminous efficiency according to an insertion depth of a conventional PDP cell and a third sustain electrode pair of a PDP cell according to the first to third embodiments of the present invention.

FIG. 11 is a graph showing luminous efficiency according to an insertion depth of a third sustain electrode pair of a PDP cell according to the first to third embodiments of the present invention. FIG.

<Description of Symbols for Main Parts of Drawings>

10, 30: upper substrate 12Y, 32Y: scanning / sustaining electrode

12Z, 32Z: common sustain electrode 14, 34: upper dielectric layer

16, 36: protective film 18, 38: the lower substrate

20X, 40X: address electrode 22, 42: lower dielectric layer

24, 44 partition 26, 46 phosphor layer

In order to achieve the above object, the plasma display panel according to the present invention includes a first sustain electrode pair which is alternately supplied with a first sustain voltage to cause sustain discharge, and sustain electrodes disposed on both sides of the first sustain electrode pair, respectively. And a second sustain electrode pair supplied with a second sustain voltage higher than the first sustain voltage to extend a sustain discharge path, wherein the first sustain electrode pair and the second sustain electrode pair are stepped. It is done.

Forming surfaces of the first and second sustain electrode pairs are different.

The second sustain electrode pair is closer to the discharge space than the first sustain electrode pair.

The first sustain electrode pair is formed on a substrate.

The second sustain electrode pair is formed close to the edge of the discharge cell.

The second sustain voltage is 20 V or more higher than the first sustain voltage.

And a plurality of auxiliary storage electrode pairs including sustain electrodes disposed on both sides of the first sustain electrode pair at predetermined intervals, respectively, and supplied with the first sustain voltage.

Each of the first and second sustain electrode pairs and the auxiliary sustain electrode pairs may be formed of only a bus electrode.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

A preferred embodiment of the present invention will be described with reference to FIGS. 5A to 11.

5A and 5B, the discharge cells of the PDP according to the present invention are narrow first to third scan / sustain bus electrodes Y1, Y2, which are formed side by side at equal intervals on the upper substrate 30. Y3) and the first to third common sustain bus electrodes Z1, Z2, and Z3, and the address electrode 40X formed on the lower substrate 38 is provided.

Each of the first to third scan / sustain bus electrodes Y1, Y2, and Y3 and the first to third common sustain bus electrodes Z1, Z2, and Z3 are formed of bus electrodes having high electrical conductivity. These bus electrodes serve to stably supply a constant voltage to the panel by using a highly conductive material. To this end, the first to third scan / sustain bus electrodes Y1, Y2, and Y3 and the first to third common sustain bus electrodes Z1, Z2, and Z3 generally use an opaque material that cannot transmit visible light. Have.

As such, the first and second scan / sustain bus electrodes Y1 of the first to third scan / sustain bus electrodes Y1, Y2, and Y3 and the first to third common sustain bus electrodes Z1, Z2, and Z3 are the same. , Y2 and the first and second common sustain bus electrodes Z1 and Z2 are formed on the upper substrate 30. On the other hand, the third scan / sustain bus electrode Y3 and the third common sustain bus electrode Z3 positioned at the edge of the discharge cell are inserted into the upper dielectric layer 34. That is, the first and second scan / sustain bus electrodes Y1 and Y2 and the first and second common sustain bus electrodes Z1 and Z2 are formed on the upper substrate 30, and the third scan / sustain bus electrodes (Y3) and the third common sustain bus electrode Z3 are formed close to the passivation layer 36.

The upper dielectric layer 34 and the passivation layer 36 are formed on the first and second scan / sustain bus electrodes Y1 and Y2 and the first and second common sustain bus electrodes Z1 and Z2 formed on the upper substrate 30. This is laminated. Accordingly, the third scan / sustain bus electrode Y3 and the third common sustain bus electrode Z3 are inserted close to the passivation layer 36 so that the first and second scan / sustain bus electrodes Y1 and Y2 and the first and second scan bus electrodes Y3 and Y2 are connected to the protective film 36. And a formation surface different from the second common sustain bus electrodes Z1 and Z2.

The wall charges generated during the plasma discharge are accumulated in the upper dielectric layer 34 as described above.

The protection layer 36 prevents the ions generated during the plasma discharge from damaging the upper dielectric layer 34 and increases the discharge efficiency of the secondary electrons. As the protective film 36, magnesium oxide (MgO) is usually used.

The lower dielectric layer 42 and the partition wall 44 are formed on the lower substrate 38 on which the address electrode 40X is formed, and the phosphor layer 46 is coated on the surfaces of the lower dielectric layer 42 and the partition wall 44. The address electrode 40X is formed in a direction crossing the first to third scan / sustain bus electrodes Y1, Y2 and Y3 and the first to third common sustain bus electrodes Z1, Z2 and Z3.

The partition wall 44 is formed in parallel with the address electrode 40X to prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 46 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert gas for gas discharge is injected into the discharge space provided between the upper substrate 30 / lower substrate 38 and the partition wall 44.

The AC surface discharge type PDP is driven by dividing one frame into several subfields having different discharge times in order to express gray level of an image. Each subfield is further divided into a reset period for uniformly causing discharge, an address period for selecting a discharge cell, and a sustain period for expressing gray scale according to the number of discharges. For example, when the image is to be displayed with 256 gray levels, the frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields. Each of the eight subfields is further divided into an address period and a sustain period. Here, the reset period and the address period of each subfield are the same for each subfield, while the sustain period is 2 ⁿ (n = 0,1,2,3,4,5,6,7) in each subfield. Is increased. In this way, since the sustain period is different in each subfield, the gray level of the image can be expressed.

Here, in the reset period, a reset pulse is supplied to the first to third common sustain bus electrodes Z1, Z2, and Z3 to generate a reset discharge.

In the address period, a scan pulse is supplied to the first to third scan / sustain bus electrodes Y1, Y2, and Y3, and a data pulse is supplied to the address electrode 40X, so that the first to third scan / sustain bus electrodes Y1 are supplied. , Y2, Y3 and the first to third common sustain bus electrodes Z1, Z2, and Z3 generate an address discharge. During the address discharge, wall charges are formed in the upper and lower dielectric layers 34 and 42.

In the sustain period, as illustrated in FIG. 6, pulse signals alternately supplied to the first to third scan / sustain bus electrodes Y1, Y2 and Y3 and the first to third common sustain bus electrodes Z1, Z2 and Z3 ( Vsus causes sustain discharge between the first to third scan / sustain bus electrodes Y1, Y2, and Y3 and the first to third common sustain bus electrodes Z1, Z2, and Z3.

FIG. 6 is supplied to the first to third scan / sustain bus electrodes Y1, Y2 and Y3 and the first to third common sustain bus electrodes Z1, Z2 and Z3 in the sustain period according to the embodiment of the present invention. A waveform diagram showing a drive waveform.

Referring to FIG. 6, the PDP according to the present invention includes a driving voltage and first and second scans supplied to the third scan / sustain bus electrode Y3 and the third common sustain bus electrode Z3 formed on the edge of the discharge cell. The driving voltages supplied to the sustain bus electrodes Y1 and Y2 and the first and second common sustain bus electrodes Z1 and Z2 are differently supplied.

That is, the alternate driving voltages supplied to the first and second scan / sustain bus electrodes Y1 and Y2 and the first and second common sustain bus electrodes Z1 and Z2 are driven to the conventional surface discharge PDP cell. It is supplied equal to the voltage Vsus. In addition, the alternate driving voltage Vsus + 20V supplied to the third scan / sustain bus electrode Y3 and the third common sustain bus electrode Z3 is the first and second scan / sustain bus electrodes Y1 and Y2. The driving voltage Vsus supplied to the first and second common sustain bus electrodes Z1 and Z2 is increased by about 20V, respectively.

Each driving pulse is formed to be adjacent to each other as it is supplied to the first to third scan / sustain bus electrodes Y1, Y2, and Y3 and the first to third common sustain bus electrodes Z1, Z2, and Z3. Primary discharge occurs between the scan / sustain bus electrode Y1 and the first common sustain bus electrode Z1. As such, when the primary discharge occurs, charged particles are generated, and the secondary discharge is induced between the second scan / sustain bus electrode Y2 and the second common sustain bus electrode Z2 by the priming effect of the generated charged particles. . In addition, a third discharge is induced between the third scan / sustain bus electrode Y3 and the third common sustain bus electrode Z3 by the priming effect of the charged particles generated by the secondary discharge.

As such, a wide gap between the first to third scan / sustain bus electrodes Y1, Y2, and Y3 and the first to third common sustain bus electrodes Z1, Z2, and Z3 including three narrow bus electrodes is provided. Through this, the discharge path is lengthened. Accordingly, the discharge area is increased to improve the overall luminous efficiency.

FIG. 7 is a graph comparing luminous efficiency of three PDP cells having a distance between different bus electrodes and a conventional PDP cell according to an embodiment of the present invention.

In Fig. 7, the horizontal axis represents the sustain voltage (V), and the vertical axis represents the luminous efficiency (lm / W).

In the conventional PDP cell, the interval between the scan / sustain electrode and the common sustain electrode is 60 mu m, and each electrode width is 380 mu m. In addition, the distance between the boundary of the PDP cell and each electrode is 220 탆.

First to third scan / sustain bus electrodes Y1, Y2, and Y3 and first to third common sustain bus electrodes Z1 and Z2 of the first PDP, the second PDP, and the third PDP used in the embodiment of the present invention. , The interval between Z3) is 60 μm, which is the same as in the case of a general PDP, and includes first to third scan / sustain bus electrodes Y1, Y2 and Y3 and first to third common sustain bus electrodes Z1, Z2, The width and spacing of Z3) are as follows.

The distance between the third scan / sustain bus electrode Y3 or the third common sustain bus electrode Z3 at the boundary of the discharge cell is d1, and the third scan / sustain bus electrode Y3 and the second scan / sustain bus The distance between the electrodes Y2 or the distance between the third common sustain bus electrode Z3 and the second common sustain bus electrode Z2 is d2, and the second scan / sustain bus electrode Y2 and the first scan / sustain are The distance between the bus electrodes Y1 or the distance between the second common sustain bus electrode Z2 and the first common sustain bus electrode Z1 is referred to as d3.

In addition, the width of the third scan / sustain bus electrode Y3 and the third common sustain bus electrode Z3 is w1, and the width of the second scan / sustain bus electrode Y2 and the second common sustain bus electrode Z2 is The width of the first scan / sustain bus electrode Y1 and the first common sustain bus electrode Z1 is referred to as w2.

In the first PDP, d1, d2 and d3 are 220 µm, 120 µm and 120 µm, respectively, and w1, w2 and w3 are 40 µm, 40 µm and 60 µm, respectively. In the second PDP, d1, d2 and d3 are 180 µm, 140 µm and 140 µm, respectively, and w1, w2 and w3 are 40 µm, 40 µm and 60 µm, respectively. In the third PDP, d1, d2 and d3 are 160 µm, 160 µm and 160 µm, respectively, and w1, w2 and w3 are 40 µm, 40 µm and 40 µm, respectively. Also, the insertion depth of the third scan / sustain bus electrode Y3 and the third common sustain bus electrode Z3 inserted into the outer upper dielectric 34 of the cell is 35 μm from the upper substrate 30.

Referring to FIG. 7, PDPs according to an embodiment of the present invention have a higher luminous efficiency than the conventional case. For example, the third PDP having the largest gap between bus electrodes has the highest luminous efficiency value, and the conventional PDP has the lowest luminous efficiency value.

In other words, when the sustain voltage is 200 V, the conventional PDP has luminous efficiency of 1.39 1./W, while the first PDP is 3.09 ㏐ / W, the second PDP is 3.38 ㏐ / W, and the third PDP is 3.88 ㏐. Each has a luminous efficiency of / W.

Therefore, PDPs according to the embodiment of the present invention have a light emission efficiency value improved by about 2.2 to 2.8 times compared to the conventional PDP.

8 is a diagram illustrating a luminance value cd / m ² according to a change in the sustain voltage V according to an exemplary embodiment of the present invention.

Referring to FIG. 8, PDPs according to an embodiment of the present invention have a higher luminance value than in the conventional case. For example, the third PDP has the highest luminance value, and the conventional PDP has the lowest luminance value.

In other words, the conventional PDP has a luminance of 610 mW / m 2 when the sustain voltage is 200 V, while the first PDP is 1520 mW / m 2, the second PDP is 1613 mW / m 2, and the third PDP is 1919 mW / m 2. The luminance of m 2 is respectively shown.

Therefore, PDPs according to an embodiment of the present invention have a luminance value that is approximately 2.5 to 3.1 times improved compared to the conventional PDP.

9 is a diagram illustrating a value of power consumption (W) according to the change of the sustain voltage (V) according to an embodiment of the present invention.

9, PDPs according to an embodiment of the present invention have a slightly higher power consumption value than in the conventional case. For example, the first PDP has the highest power consumption value, and the conventional PDP and the third PDP have the lowest power consumption value.

In other words, when the sustain voltage is 200 V, the conventional PDP has a power consumption value of 0.00062 W, while the first PDP has 0.00070 W, the second PDP has 0.00068 W, and the third PDP has 0.00062 W, respectively. Have

Therefore, PDPs according to the embodiment of the present invention have a power consumption value that is similar or improved by 1.1 times compared to the conventional PDP.

FIG. 10 is a graph comparing luminous efficiency according to insertion depths of bus electrodes Y3 and Z3 inserted into an upper dielectric using a third PDP used in an embodiment of the present invention.

Referring to FIG. 10, the third PDP used in the embodiment of the present invention has an upper substrate (0 μm) than the outer bus electrodes Y3 and Z3 of the cell are positioned on the upper substrate in the same manner as other bus electrodes (0 μm). 30) shows high luminous efficiency at each sustain voltage when they are 15 µm, 25 µm and 35 µm apart, respectively.

In other words, when the outer bus electrodes Y3 and Z3 of the cell are not inserted into the dielectric and the insertion depth is shallow to about 15 μm, the light emission efficiency is very low because discharge is not properly formed at a low driving voltage. As shown in FIG. 11, the greater the distance between the outer bus electrodes Y3 and Z3 of the cell from the upper substrate 30, the higher the luminous efficiency.

Referring to FIG. 11, when the sustain voltage is 220 V, light emission efficiency according to the insertion depth of the bus electrodes Y3 and Z3 inserted into the upper dielectric is compared to be the outer bus electrodes Y3 and Z3 of the cell. The further away from the upper substrate and the closer to the discharge space, the greater the luminous efficiency increases.

Therefore, in order to improve the luminous efficiency of the PDP according to the present invention, it is preferable to insert the outer bus electrodes Y3 and Z3 into the dielectric as deep as possible within the range of stable operation.

As described above, the plasma display panel according to the present invention comprises the scan / sustain electrode and the common sustain electrode only with six narrow electrically conductive bus electrodes and the outermost bus electrode close to the discharge space. By forming and applying a voltage 20V higher than the driving voltage applied to the other bus electrodes, the light emission efficiency is improved by increasing the discharge path and the discharge area through a wide gap between the bus electrodes. In addition, the production cost is reduced by not using a transparent electrode.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (8)

A first sustain electrode pair alternately supplied with a first sustain voltage to cause sustain discharge; A second sustain electrode pair including sustain electrodes disposed on both sides of the first sustain electrode pair, and having a second sustain voltage higher than the first sustain voltage to extend a sustain discharge path; And the first sustain electrode pair and the second sustain electrode pair are stepped. The method of claim 1, And the formation surfaces of the first and second sustain electrode pairs are different. The method of claim 1, And the second sustain electrode pair is closer to the discharge space than the first sustain electrode pair. The method of claim 2, And the first sustain electrode pair is formed on a substrate. The method of claim 1, And the second sustain electrode pair is formed close to the edge of the discharge cell. The method of claim 1, And the second sustain voltage is at least 20V higher than the first sustain voltage. The method of claim 1, And an auxiliary sustain electrode pair to which the first sustain voltage is supplied, including sustain electrodes disposed on both sides of the first sustain electrode pair at predetermined intervals, respectively. The method of claim 7, wherein And the first and second sustain electrode pairs and the auxiliary sustain electrode pairs each include only bus electrodes.