KR100927710B1 - Plasma display panel - Google Patents

Abstract

The present invention mitigates the decrease of the discharge intensity near the edge of the discharge cell and induces a sustain discharge generated between the pair of display electrodes to the opposite discharge, wherein movement of the surface charge from the display electrode to the electrode close to the fluorescent layer is prevented. It relates to a plasma display panel that facilitates.

A plasma display panel according to the present invention includes: a first substrate and a second substrate disposed to face each other; Address electrodes formed on the first substrate in parallel with one direction; Barrier ribs disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells; Phosphor layers formed in the discharge cells; First and second electrodes corresponding to each discharge cell while extending in a direction crossing the address electrodes on the second substrate; And third electrodes spaced apart from the first electrodes and the second electrodes to protrude toward the first substrate in a direction away from the second substrate and to face each other with a space therebetween. Four electrodes, each of the first electrode and the second electrode extending in a direction crossing the address electrode and corresponding to each discharge cell, from the bus electrode toward the center of each discharge cell; And a protruding electrode which protrudes, the protruding electrode having a wide portion positioned in the center of the discharge cell, a narrow portion connected to the bus electrode and formed to have a smaller width than the wide portion, and the large portion and the small portion connected to each other. It includes a connecting portion.

Plasma display, counter discharge, protruding electrode, large part, small part, connection part

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a graph schematically showing a voltage distribution between a cathode and an anode in a typical glow discharge.

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

FIG. 3 is a partial plan view of a first embodiment schematically showing the structure of electrodes and discharge cells in the plasma display panel shown in FIG. 2.

4 is a partial cross-sectional view taken along line A-A with the plasma display panel shown in FIG.

FIG. 5 is a partial plan view of a second embodiment schematically showing a structure of electrodes and a discharge cell in the plasma display panel shown in FIG. 2.

6 is a partial cross-sectional view showing in detail the structure of the front substrate in the plasma display panel according to the present invention.

7 is a partial cross-sectional view schematically showing the size and location of the cathode spot and the anode spot with time after the start of discharge in the plasma display panel according to the present invention.

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 having an electrode structure that is advantageous for realizing a display of high density and high luminance.

In general, a plasma display panel (hereinafter referred to as a 'PDP') is used to implement an image using visible light generated by a vacuum ultraviolet ray (VUV) emitted from a plasma obtained through gas discharge. Display element. Such a PDP can realize an ultra-large screen of 60 inches or more with a thickness of only 10 cm or less, and is a self-luminous display device such as a CRT. In addition, the manufacturing method is simpler than LCD, and thus has advantages in terms of productivity and cost.

The structure of the PDP has been developed for a long time since the 1970s, and the structure generally known is a three-electrode surface discharge type structure. The three-electrode surface discharge type structure consists of a front substrate including two electrode groups located on the same surface and a back substrate including address electrodes vertically spaced apart from each other by a predetermined distance therebetween, with a discharge gas therebetween. It is a sealed structure. In general, the presence or absence of the discharge is determined by the discharge between the scan electrode controlled independently of the two electrodes and the address electrode opposite thereto, and the sustain discharge indicating the luminance is determined by the two electrode groups located on the same plane. Is done.

The PDP glow glows to produce visible light for humans, which takes several steps to reach visible light in the human eye. That is, when a glow discharge is generated, excited gas is generated by collision between electrons and gases, and ultraviolet rays are generated from the excited gas. The ultraviolet rays collide with the phosphor in the discharge cell to produce visible light, which reaches the human eye through the transparent front substrate. Through this step, input power is significantly lost.

This glow discharge is usually possible when a voltage above the discharge start voltage is applied between the two electrodes under a low atmospheric pressure (less than 1 atm). This discharge start voltage is a function of the type of gas, the atmospheric pressure, and the distance between electrodes. In the case of AC discharge, in addition to these three, the discharge start voltage is also affected by the dielectric capacitance (dielectric constant, electrode area, dielectric thickness) and the frequency of the applied voltage.

Although a very high voltage is required for the discharge to be initiated, the voltage distribution between the cathode and the anode is distorted as shown in FIG. 1 due to the difference in the space charge generated around the cathode and the anode once the discharge occurs. Figure 1 shows that most of the voltage is consumed around two electrodes, that is, in areas called cathode sheath and anode sheath, and relatively little voltage is consumed in the positive column region. Shows that In particular, it is known that the glow discharge generated in the PDP is much higher than the voltage consumed in the cathode sheath region.

Visible light is generated when the ultraviolet light impinges on the phosphor, and the ultraviolet light is generated when the energy level is changed from the excited state of xenon to the ground state of xenon. On the other hand, xenon in an excited state is made by the collision of stable xenon and electrons. Therefore, in order to increase the ratio of generating visible light among the input energy, that is, the luminous efficiency, the electron heating efficiency must be increased.

In general, since the electron heating efficiency in the positive column region is higher than the preheating efficiency in the cathode sheath region, the improvement of the PDP luminous efficiency is possible by increasing the positive column region. Since the sheath regions have almost the same thickness under the same pressure, it is necessary to increase the distance of discharge to increase the luminous efficiency.

In the case of a PDP having a three-electrode structure, discharge is initiated in the region between the two electrodes closest to the center of the discharge cell, after which the discharge moves to the edge region of the electrode. The discharge occurs in the center region because the discharge start voltage in this region is low. In general, the discharge start voltage is a function of the product of the pressure and the distance between the electrodes, and the PDP operating region is located to the right of the minimum value of the Paschen curve. Once the discharge is initiated, the discharge is maintained under a voltage much lower than the discharge start voltage due to the formation of space charge, and the voltage applied between the two electrodes gradually decreases with time. After the start of the discharge, the intensity of the electric field is weakened as ions and electrons accumulate in the central region, and the discharge disappears in this region.

Cathode spots and anode spots move over time in areas without surface charge, ie around the electrode edges. At this time, since the voltage applied between the two electrodes decreases with time, strong discharge occurs in the center region of the discharge cell (low light emitting efficiency), and weak discharge occurs near the edge of the discharge cell (high light emitting efficiency). Based on the same principle, the conventional three-electrode surface discharge structure has a low ratio used for heating electrons among the input energy, resulting in low luminous efficiency.

In order to overcome the weakness of the three-electrode structure, a method of increasing the distance between the display electrodes may be considered, but this causes an increase in the discharge start voltage.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to alleviate a decrease in the intensity of discharge near the edge of a discharge cell, and to induce a sustain discharge generated between a pair of display electrodes to a counter discharge. A plasma display panel having a cell structure is provided.

Another object of the present invention is to provide a plasma display panel which facilitates the movement of surface charge from the display electrode to the electrode close to the fluorescent layer in inducing the sustain discharge generated in the pair of display electrodes to the opposite discharge.

In order to achieve the above object, the plasma display panel according to the present invention,

A first substrate and a second substrate disposed to face each other;

Address electrodes formed on the first substrate in parallel with one direction;

Barrier ribs disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells;

Phosphor layers formed in the discharge cells;

First and second electrodes corresponding to each discharge cell while extending in a direction crossing the address electrodes on the second substrate; And

Third and fourth electrodes spaced apart from the first and second electrodes to protrude toward the first substrate in a direction away from the second substrate, and to face each other with a space therebetween Including electrodes,

 Each of the first electrode and the second electrode,

A bus electrode corresponding to each discharge cell while extending in a direction crossing the address electrode and protruding electrode protruding from the bus electrode toward the center of each discharge cell,

The protruding electrode,                     

A wide portion positioned in the center of the discharge cell, a narrow portion connected to the bus electrode and formed to have a smaller width than the wide portion, and a connecting portion interconnecting the large portion and the small portion.

The wide portion is formed to have a width larger than the width of the narrow portion, and the small portion is formed to have a width larger than the width of the connecting portion.

The wide part is formed with an area larger than the area of the narrow part and the connecting part.

The wide portions are formed in a straight line along the direction crossing the address electrodes. In addition, the wide portion is formed by branching in the extending direction of the address electrode.

The narrow portion of the protruding electrode is formed to have a width larger than that of the bus electrode.

A narrow portion of the protruding electrode is formed to have a width larger than that of the third electrode and the fourth electrode.

The protruding electrode is formed of a transparent electrode.

The third electrode and the fourth electrode are formed on a layer different from the layer on which the first electrode and the second electrode are formed on the second substrate.

The cross section of the third electrode and the fourth electrode cut in a plane perpendicular to the longitudinal direction is formed to have a longer length in the direction perpendicular to the second substrate than the length in the direction parallel to the second substrate.

The third electrode and the fourth electrode are formed of a metal electrode.

The second substrate is provided with the first electrode and the second electrode, the first electrode and the second electrode are covered with a first dielectric layer, and a third electrode and a fourth electrode are formed on the first dielectric layer, A structure is formed in which the third electrode and the fourth electrode are surrounded by the second dielectric layer.

The first dielectric layer is formed of a transparent dielectric, and the second dielectric layer is formed of an opaque dielectric.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

2 is a partially exploded perspective view illustrating a plasma display panel according to the present invention, and FIG. 3 is a partial plan view of a first embodiment schematically showing the structure of electrodes and discharge cells in the plasma display panel shown in FIG. 4 is a partial cross-sectional view taken along line AA of the plasma display panel shown in FIG.

Referring to the PDP according to the present invention with reference to the drawings, this PDP is basically a first substrate 10 (hereinafter referred to as 'back substrate') and the second substrate 20 (hereinafter referred to as 'front substrate') The battery cells are disposed to face each other at predetermined intervals, and a plurality of discharge cells 18 are partitioned by partition walls 16 in the spaces between the substrates 10 and 20. In the discharge cell 18, a phosphor layer 19 that absorbs ultraviolet rays and emits visible light is formed along the partition wall and the bottom surface, and discharge gas (for example, xenon (Xe), neon ( Ne) and the like (mixed gas) are filled.

Address electrodes 12 are formed along one direction (y-axis direction of the drawing) on the opposite surface of the front substrate 20 of the rear substrate 10, and cover the address electrodes 12 to cover the entire inner surface of the rear substrate 10. A dielectric layer 14 is formed in the. The address electrodes 12 are formed parallel to each other while maintaining a distance corresponding to the other address electrodes 12 adjacent to the discharge cells 18 along the x axis direction.

The partition wall 16 is formed on the dielectric layer 14 formed on the rear substrate 10. In this embodiment, the partition wall 16 includes a first partition member 16a extending in parallel with the address electrode 12; The second partition member 16b is formed to intersect the first partition member 16a and partitions each discharge cell 18 into an independent discharge space. The barrier rib structure is not limited to the above-described structure, and the barrier rib structure having only the barrier member in parallel with the address electrode may be applied to the present invention, and the barrier rib structure having various shapes for partitioning the discharge cells may be used. It also belongs to the scope of the present invention.

Meanwhile, referring to FIG. 3, the first electrode 21 and the first electrode 21 are formed on the inner surface of the front substrate 20 opposite to the rear substrate 10 along the direction crossing the address electrode 12 (the x-axis direction of the drawing). The two electrodes 21 are formed to extend each other. In the present exemplary embodiment, each of the first electrode 21 and the second electrode 21 extends along a direction crossing the address electrode 12 and has bus electrodes 21b and 22b corresponding to the respective discharge cells 18. And protruding electrodes 21a and 22a extending from the bus electrodes 21b and 22b toward the center of each discharge cell 18 to form a predetermined discharge gap g. In this case, the bus electrodes 21b and 22b may be made of metal electrodes, and the enlarged electrodes 21a and 22a may be made of transparent electrodes such as indium tin oxide (ITO) electrodes to secure the aperture ratio.

In the present exemplary embodiment, each of the protruding electrodes 21a and 22a is positioned at the center of the discharge cell 18 and positioned at the outer edges of the wide portions 21aa and 22aa and the discharge cell 18 having a relatively large width Wa. Narrow portions 21ab and 22ab which are connected to the bus electrodes 21b and 22b and are formed to have a width Wb narrower than the wide portions 21aa and 22aa, and the wide portions 21aa and 22aa and the narrow portions 22ab, 23ab) is formed to include the connecting portions (21ac, 22ac) which are electrically interconnected, respectively. The connecting portions 21ac and 22ac are formed to have a width Wc narrower than the width Wb of the small width portions 22ab and 23ab.

The wide portions 21aa and 22aa are smaller than the areas of the narrow portions 21ab and 22ab and the connecting portions 21ac and 22ac in order to lower the breakdown voltage between the first and second electrodes 21 and 22. It is desirable to form a large area. The wide portions 21ab and 22ab having such a shape may be variously formed.

As an example, FIG. 3 illustrates wide portions 21aa and 22aa formed in a straight line along a direction intersecting with the address electrode 12 (x-axis direction), and FIG. 5 illustrates an extension direction of the address electrode 12 (see FIG. The wide parts 21aa and 22aa which are branched and formed in the y-axis direction) are illustrated. The wide portions 21aa and 22aa of FIG. 3 simply form a surface discharge structure at the discharge gap g, whereas the wide portions 21aa and 22aa of FIG. 5 are formed at the center portion of the discharge cell 18. g) is elongated, i.e., a long gap is formed to improve luminous efficiency.

The narrow portions 21ab and 22ab of the protruding electrodes 21a and 22a are preferably formed to have a width larger than that of the bus electrodes 21b and 22b as shown in FIGS. 3 and 5. This facilitates the alignment of both in forming the bus electrodes 21b and 22b on the protruding electrodes 21a and 22a.

As shown in FIG. 6, the narrow portions 21ab and 22ab of the protruding electrodes 21a and 22a have surface charges due to surface discharge of the first and second electrodes 21 and 22. The width of the third electrode 23 and the fourth electrode 24 may be greater than that of the third electrode 23 and the fourth electrode 24 so as to smoothly move toward the 23 and 24 sides.

On the other hand, a pair of the first electrode 21 and the second electrode 22 correspond to each discharge cell 18 to be involved in the discharge of the sustain period, one of the first, second electrode (21, 22) Together with the address electrode 12 is involved in the discharge of the address section. However, the electrodes do not need to be limited to the above because they may have different roles depending on the signal voltage applied thereto.

In addition, referring to FIG. 4, in the present exemplary embodiment, the front substrate 20 is spaced apart from the first electrodes 21 and the second electrodes 22, and the third electrodes 23 and the fourth electrode. 24 are formed respectively. The third electrodes 23 and the fourth electrodes 24 are spaced apart from the first and second electrodes 21 and 22, respectively, and are separated from the front substrate 20 (the negative z in the drawing). Protruding toward the first substrate 10 in the axial direction, and are formed to face each other with a space therebetween. The space formed as described above may induce an opposite discharge between the third electrode 23 and the fourth electrode 24 facing each other. The third electrode 23 and the fourth electrode 24 are preferably made of a metal electrode having a low electrical resistance.                     

In the present embodiment, the third electrode 23 and the fourth electrode 24 are formed on layers different from those on which the first electrode 21 and the second electrode 22 are formed. That is, the first dielectric layer 28a is formed on the front substrate 20 to cover the first electrode 21 and the second electrode 22, and the third electrode 23 and the third electrode 23 are formed on the first dielectric layer 28a. Four electrodes 24 are formed, and a second dielectric layer 28b is formed to surround these third and fourth electrodes 23 and 24. In this case, the first dielectric layer 28a is preferably made of a transparent dielectric material to emit visible light generated in the discharge cells 18 to the outside. The second dielectric layer 28b may be made of the same material as the first dielectric layer 28a. Alternatively, the second dielectric layer 28b may be made of an opaque dielectric material to improve the clear contrast of the PDP.

As described above, the third electrode 23 and the fourth electrode 24 are formed to protrude, and the second dielectric layer 28b is formed to surround them, and dielectric blocks are formed between the discharge cells 18 adjacent to each other. This dielectric block prevents ions and electrons from moving between neighboring discharge cells 18, significantly reducing the occurrence of crosstalk and thus reducing misdischarge between on-off cells.

The bus electrodes 21b and 22b of each of the first electrode 21 and the second electrode 22 are formed to pass over the discharge cell 18 adjacent to the edge of each discharge cell 18, and the third electrode. The 23 and fourth electrodes 24 are formed to extend in the direction crossing the address electrode 12 at positions corresponding to the bus electrodes 21b and 22b. That is, the third electrodes 23 and the fourth electrodes 24 are also formed to pass over the discharge cells 18 adjacent to the edges of the respective discharge cells 18, except that the first electrodes 21 and The second electrode 22 is spaced apart from each other with the first dielectric layer 28a interposed therebetween.

The MgO protective film 29 formed on the first dielectric layer 28a and the second dielectric layer 28b protects the dielectric layer from collision of ions of the ionized atoms during plasma discharge. The MgO protective layer 29 also has an advantage of increasing discharge efficiency because the emission coefficient of secondary electrons is high when ions collide with each other.

6 is a partial cross-sectional view showing in detail the structure of the front substrate in the plasma display panel according to the present invention.

In this embodiment, in order for the opposite discharge to occur easily between the third electrode 23 and the fourth electrode 24, the end of the rear substrate 20 side of the third electrode 23 (or the fourth electrode 24) is formed. It should protrude further toward the rear substrate 20 than the surface of the first dielectric layer 28a corresponding to the center of the discharge cell 18, and the bus electrodes 21b and 22b of the first electrode 21 and the second electrode 22. It is preferable that the thickness measured in the thickness direction (z-axis direction) of the panel is thicker than). That is, referring to FIG. 6, the conditions δ> 0 and H (b) <H (m) are satisfied. Here,? Represents the length of the third electrode 23 (or the fourth electrode 24) protruding from the surface of the first dielectric layer 28a, and H (b) is a bus measured from the front substrate 20 surface. The thickness of the electrodes 21b and 22b is shown, and H (m) represents the thickness which measured the 3rd electrode 23 (or the 4th electrode 24) in the thickness direction of a panel.

In order to fabricate such a front plate structure, the dielectric layer surrounding the electrode installed on the front substrate 20 may be dug out by sandblasting, or the dielectric layer may be partially cut out by using a photosensitive dielectric or green sheet. Alternatively, the electrode part including the third electrode 23 and the fourth electrode 24 is separately manufactured by using a thick film ceramic sheet (TFCS) technique, and then the first electrode 21 and the second electrode 22 are formed. It can also be manufactured by coupling to the front substrate 20.

The larger the width Wb of the bus electrodes 21b and 22b and the width Wm of the third electrode 23 (or the fourth electrode 24), or the bus electrodes 21b, 22b and the third electrode ( Since the closer the distance H (mb) is between 23 (or the fourth electrode 24), the capacitance between the first and second electrodes 21 and 22 and the third and fourth electrodes 23 and 24 increases. Discharge may be easily transferred from the first and second electrodes 21 and 22 on the front substrate 20 to the third and fourth electrodes 23 and 24.

The cross section which cuts the 3rd electrode 23 and the 4th electrode 24 into the plane perpendicular | vertical to the longitudinal direction, respectively, is perpendicular | vertical to the board | substrate surface rather than the length Wm in the direction parallel to the board | substrate surface (y-axis direction of a figure). The length Hm in one direction (z-axis direction in the drawing) may be longer. In other words, the height from the front substrate 20 surface of the third electrode 23 and the fourth electrode 24 can be made higher. In this case, when the size of the discharge cell 18 needs to be reduced in the planar direction in order to implement a high-definition display, the height of the third electrode 23 and the fourth electrode 24 may be increased to compensate for this.

Meanwhile, when the second dielectric layer 28b is formed to surround the third electrode 23 and the fourth electrode 24, as shown in FIG. 6, the third electrode 23 and the fourth electrode 24. The thickness of the second dielectric layer 28b formed on the surface where the third electrode 23 and the fourth electrode 24 face the back substrate 10 rather than the thickness W1 of the second dielectric layer 28b formed on the opposite surface. (H1) is formed thicker. In addition, the third electrode 23 and the fourth electrode 24 is formed between the different electrodes between the discharge cells 18 adjacent to the thickness (W1) of the second dielectric layer 28b formed on the opposite surface The thickness W2 of the two dielectric layers 28b is formed larger. Through this structure, erroneous discharge can be prevented from occurring between the electrodes disposed in the adjacent discharge cells 18 during the sustain discharge.

7 is a partial cross-sectional view schematically showing the size and location of the cathode spot and the anode spot with time after the start of discharge in the plasma display panel according to the present invention.

In order to drive the PDP formed as described above, an external voltage may be selectively selected from one of the third and fourth electrodes 23 and 24 or the bus electrodes 21b and 22b of the first and second electrodes 21 and 22. Is applied. In other words, one of the electrode groups among the bus electrodes 21b and 22b of the third and fourth electrodes 23 and 24 and the first and second electrodes 21 and 22 may be a floating electrode. In this case, a potential difference is generated between the third and fourth electrodes 23 and 24 and the bus electrodes 21b and 22b of the first and second electrodes 21 and 22 by capacitive coupling. do.

After discharge is initiated in a region closest to the first electrode 21 and the second electrode 22 formed on the front substrate 20-the center of the discharge cell 18-as ions and electrons accumulate. The voltage across the discharge gap g decreases, and thus the cathode spot and the anode spot move to an area without surface charge, that is, an edge area of the discharge cell 18. At this time, the voltage applied to the discharge gap g decreases with time, so that the intensity of the discharge becomes weak (see FIGS. 7A and 7B).                     

In the structure according to the present embodiment, unlike the conventional three-electrode structure in which the discharge is turned off at the edge region of the discharge cell 18, the discharge is performed to the third and fourth electrodes 23 and 24 provided at the edge of the discharge cell 18. Is moved. In the third and fourth electrodes 23 and 24, since discharge occurs more easily than the bus electrodes 21b and 22b between the third electrode 23 and the fourth electrode 24 utilizing the opposite discharge. The discharge intensity of is only slightly weaker as compared with the discharge on the surfaces of the bus electrodes 21b and 22b. Discharge is maintained for a long time while the cathode spot and the anode spot move from the upper vicinity (z-axis direction) to the lower vicinity of the third and fourth electrodes 23 and 24, and the surface charge is maintained in the third and fourth electrodes 23. After sufficiently accumulating on the second dielectric layer 28b to which 24 is applied, the discharge disappears (see FIGS. 6C and 6D).

As such, when the two electrodes are the same, since the discharge start voltage in the counter discharge electrode structure is much lower than that of the coplanar discharge electrode structure, discharge is likely to occur. The discharge transition from the first and second electrodes 21 and 22 installed in the 20 to the third and fourth electrodes 23 and 24 is easy. Therefore, there is an advantage that the discharge is maintained for a long time in the region having a long discharge path with good luminous efficiency-near the edge of the discharge cell.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

 As described above, according to the plasma display panel according to the present invention, the first substrate and the second electrode are provided on the front substrate, and the third and fourth electrodes spaced apart from each other are provided to protrude toward the rear substrate. The sustain discharge generated by the surface discharge between the first and second electrodes is induced by the counter discharge between the third and fourth electrodes, thereby alleviating the decrease in the discharge intensity near the edge of the discharge cell, and the first and second electrodes respectively. It is formed of a bus electrode and a protruding electrode, and the protruding electrode is provided with a wide part, a narrow part, and a connecting part to correspond to the discharge cells. In induction, there is an effect of facilitating the transfer of surface charges.

Claims (14)

A first substrate and a second substrate disposed to face each other; Address electrodes formed on the first substrate in parallel with one direction; Barrier ribs disposed in a space between the first substrate and the second substrate to partition a plurality of discharge cells; A phosphor layer formed inside each of the discharge cells; First and second electrodes corresponding to each of the discharge cells while extending in a direction crossing the address electrodes on the second substrate; And Third electrodes spaced apart from each other on the first electrodes and the second electrodes to protrude toward the first substrate in a direction away from the second substrate, and formed to face each other with a space therebetween; Including fourth electrodes, Each of the first electrodes and the second electrodes, A bus electrode corresponding to each of the discharge cells while extending along a direction crossing the address electrodes, and a protruding electrode protruding from the bus electrode toward the center of each of the discharge cells, The protruding electrode, And a narrow portion positioned at the center of the discharge cell, a narrow portion connected to the bus electrode and formed to have a smaller width than the wide portion, and a connecting portion interconnecting the large portion and the small portion. The method of claim 1, And the wide portion is formed to have a width greater than the width of the small portion, and the small portion is formed to have a width larger than the width of the connection portion. The method of claim 1, And the wide portion is formed to have a larger area than the narrow portion and the connection portion. The method of claim 1, And the wide portions are formed in a straight line in a direction crossing the address electrodes. The method of claim 1, And the wide portion is formed by branching in the extending direction of the address electrodes. The method of claim 1, And the narrow portion of the protruding electrode is formed to have a width larger than that of the bus electrode. The method of claim 1, And the narrow portion of the protruding electrode is formed to have a width greater than the width of the third and fourth electrodes. The method of claim 1, And a protrusion electrode formed of a transparent electrode. The method of claim 1, The third electrodes and the fourth electrodes are formed on a layer different from the layer on which the first electrodes and the second electrodes are formed on the second substrate. The method of claim 1, A plasma having a longer length in the direction perpendicular to the second substrate than a length in the direction parallel to the second substrate in a cross section of the third electrodes and the fourth electrodes in a plane perpendicular to the length direction Display panel. The method of claim 1, And the third electrodes and the fourth electrodes are formed of a metal electrode. The method of claim 1, The second substrate includes the first electrodes and the second electrodes, the first electrodes and the second electrodes are covered with a first dielectric layer, and the third electrodes and the second electrode are disposed on the first dielectric layer. And a fourth electrode and a structure in which the third electrodes and the fourth electrodes are surrounded by a second dielectric layer. The method of claim 12, And the first dielectric layer is formed of a transparent dielectric. The method of claim 12, And the second dielectric layer is formed of an opaque dielectric.

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