Abstract:
The present invention relates to a plasma display panel, particularly, to a plasma display panel equipped with an electrode structure which can perform readily a discharge between a scan electrode and a sustain electrode. A plasma display panel according to an aspect of the present invention comprises a front substrate comprising a scan electrode and a sustain electrode; and a rear substrate comprising a barrier rib for forming a discharge cell, wherein the scan electrode and the sustain electrode comprise a plurality of projecting electrode parts in the discharge cell. The present invention modifies the shape of the transparent electrode to broaden the discharge area, so that the luminous efficiency increases to improve a luminance. Moreover, since a stable and uniform discharge is generated, the white balance can be efficiently implemented. In addtion, the unnecessary expensive ITO area is removed and the fabrication cost of the plasma display panel can be lowered.

Description:
[0001]     This application claims the benefit of Korean Patent Application No. 10-2005-0039364, filed on May 11, 2005, which is hereby incorporated by reference for all purposes as if fully set forth herein.  
       BACKGROUND OF THE INVENTION  
       [0002]     1. Field of the Invention  
         [0003]     The present invention relates to a plasma display panel, particularly, to a plasma display panel equipped with an electrode structure which can perform readily a discharge between a scan electrode and a sustain electrode.  
         [0004]     2. Description of the Background Art  
         [0005]     Generally, a plasma display panel includes barrier ribs formed between a front panel and a rear panel. Together, the barrier ribs and the front and rear panels form cells. Each of the cells is filled with a primary discharge gas such as neon Ne, helium He or a mixed gas comprising Ne and He. In addition, each cell contains an inert gas comprising a small amount of xenon. If the inert gas is discharged using a high frequency voltage, ultraviolet rays are generated. The ultra-violet rays excite light-emitting phosphors in each cell, thus creating a visible image.  
         [0006]      FIG. 1  is a perspective view showing the structure of a conventional plasma display panel.  
         [0007]     As shown in  FIG. 1 , as to the plasma display panel, the front substrate  100  and the rear substrate  110  are parallelly combined with a given distance. The front substrate  100  includes a scan electrode  102  and a sustain electrode  103 , both of which make a pair to form a plurality of sustain electrode pairs on a front glass  101  where an image is displayed. A plurality of address electrodes  113  are arranged in order to intersect with the plurality of sustain electrode pairs on the rear glass  111  in the rear substrate  110 .  
         [0008]     The front substrate  100  includes a scan electrode  101  and a sustain electrode  102 , both of which are employed in controlling the discharge and light emission of the discharge cell. The Y electrode  101  and the Z electrode  102  each have a transparent electrode “a” made of a transparent ITO material, and a bus electrode “b” made of a metal material. The Y electrode  101  and the Z electrode  102  together form an electrode pair. The Y electrode  101  and the Z electrode  102  are covered with at least one dielectric layer  103  for limiting a discharge current and for providing insulation. A protection layer  104 , having magnesium oxide (MgO) deposited thereon to facilitate a discharge condition, is formed on the dielectric layer  103 .  
         [0009]     In the rear substrate  110 , barrier ribs  112  in the form of a stripe pattern (or well type), for forming a plurality of discharge spaces, i.e., discharge cells, are arranged in a parallel_manner. Further, a plurality of address electrodes  113  for use in achieving an address discharge which results in the generation of ultraviolet light, is disposed parallel to the barrier ribs  112 . Red (R), green (G) and blue (B) phosphors  114 , for emitting visible light for image display upon address discharge, are coated on a top surface of the rear substrate  110 . A dielectric layer  115 , which protects the address electrodes  113 , is formed between the address electrodes  113  and the phosphors  114 .  
         [0010]     Hereinafter, the electrode structure of a conventional plasma display panel is illustrated in  FIG. 2 .  
         [0011]      FIG. 2  is a plane view showing the electrode structure of the conventional plasma display panel.  
         [0012]     As shown in  FIG. 2 , the the transparent electrode a and the bus electrode b of the plasma display panel are arranged in the front substrate with a stripe type, while the address electrode  113  is formed in the rear substrate (not shown) in the direction intersecting with the transparent electrode a and the bus electrode b.  
         [0013]     A plurality of address electrodes  113  are arranged in parallel with the barrier ribs  112 .  
         [0014]     The electrode structure within the discharge cell of the plasma display panel is illustrated in  FIG. 3 .  
         [0015]      FIG. 3  is a plane view showing the electrode structure within the discharge cell of the conventional plasma display panel.  
         [0016]     As shown in  FIG. 3 , the rectangular transparent electrode a is formed in the front substrate. The transparent electrode a of a rectangular shape is positioned in the both sides where the bus electrode b in the discharge cell is formed and faces each other across the central part of the discharge cell.  
         [0017]     Moreover, the address electrode  113  intersects with the transparent electrode a and the bus electrode b, separated with the the transparent electrode a and the bus electrode b as much as a given distance in a discharge.  
         [0018]     The erosion state of the MgO surface in the life test of the plasma display panel having the electrode structure is illustrated in  FIG. 4 .  
         [0019]      FIG. 4  is a diagram showing the electric field distribution in the life test of the conventional plasma display panel.  
         [0020]     As shown in  FIG. 4 , the density of the discharge stream in the domain where a dark colour is displayed in the discharge area is great in testing the lifetime of the plasma display panel.  
         [0021]     In other words, a discharge is initiated in the intermediate domain of the ITO line width. As to the discharge path, the center region of the ITO electrode is longer in comparision with the peripheral region. As shown in  FIG. 5 , due to the discharge, the damage of MgO increases as it proceedes from the denotation  1  area to the denotation  4  area of  FIG. 4 .  
         [0022]     Therefore, it can be noticed that discharges, which is initiated in the intermediate domain of the ITO line width and proceeds near to the bus electrode, are strongly occured, while relatively weak discharges are occured in the pheripheral region of the ITO line width.  
         [0023]     As described, as to the discharge of the plasma display panel, on the whole, since the discharge is unevenly generated, it is difficult to implement a white balance.  
         [0024]     Moreover, although the ITO electrode area where a discharge is generated is fixed, which is not considered in the conventional plasma display panel. In result, there is a problem in that the fabrication cost of the plasma display panel is increased since the ITO which is expensive is used for the ITO electrode area in which a discharge is not generated.  
       SUMMARY OF THE INVENTION  
       [0025]     Accordingly, an object of the present invention is to solve at least the problems and disadvantages of the background art.  
         [0026]     The present invention is to provide a plasma display panel which is able to implement a white balance by performing an uniform discharge in the discharge performance between the scan electrode and the sustain electrode.  
         [0027]     A plasma display panel according to an aspect of the present invention comprises a front substrate comprising a scan electrode and a sustain electrode; and a rear substrate comprising a barrier rib for forming a discharge cell, wherein the scan electrode and the sustain electrode comprise a plurality of projecting electrode parts in the discharge cell.  
         [0028]     A plasma display panel panel according to another aspect of the present invention comprises a front substrate comprising a scan electrode and a sustain electrode; and a rear substrate comprising a barrier rib for forming a discharge cell, wherein each of the scan electrode and the sustain electrode comprises a plurality of projecting scan electrode parts and a plurality of projecting sustain electrode parts in the discharge cell, wherein the gap between the projecting scan electrode part and the projecting sustain electrode part confronting the projecting scan electrode comprises at least two different gaps.  
         [0029]     A plasma display panel according to still another aspect of the present invention comprises a front substrate comprising a scan electrode and a sustain electrode; and a rear substrate comprising a barrier rib for forming a discharge cell, wherein one of the scan electrode and the sustain electrode comprises a first electrode part; and a plurality of second electrode part protruding from the first electrode part.  
         [0030]     As to the present invention, by modifyiing the shape of the transparent electrode to broaden the discharge area, the luminous efficiency increases to improve a luminance. Moreover, since a stable and uniform discharge is generated, the white balance can be efficiently implemented. In addtion, the unnecessary expensive ITO area is removed and the fabrication cost of the plasma display panel can be lowered. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0031]     The accompany drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:  
         [0032]      FIG. 1  is a perspective view showing the structure of a conventional plasma display panel.  
         [0033]      FIG. 2  is a plane view showing the electrode structure of a conventional plasma display panel.  
         [0034]      FIG. 3  is a plane view showing the electrode structure within the discharge cell of a conventional plasma display panel.  
         [0035]      FIG. 4  is a diagram showing the electric field distribution in the life test of a conventional plasma display panel.  
         [0036]      FIG. 5  is a plane view showing the electrode structure within the discharge cell of the plasma display panel according to an embodiment of the present invention.  
         [0037]      FIG. 6  is a diagram for illustrating the discharge area in the present invention.  
         [0038]      FIG. 7  is a plane view showing the electrode structure within the discharge cell of the plasma display panel according to another embodiment of the present invention.  
         [0039]      FIG. 8  is a plane view showing the electrode structure within the discharge cell of the plasma display panel according to still another embodiment of the present invention.  
         [0040]      FIG. 9  is a plane view showing the electrode structure within the discharge cell of the plasma display panel according to still another embodiment of the present invention.  
         [0041]      FIG. 10  is a plane view showing the electrode structure within the discharge cell of the plasma display panel according to still another embodiment of the present invention. 
     
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS  
       [0042]     Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.  
         [0043]     A plasma display panel according to an aspect of the present invention comprises a front substrate comprising a scan electrode and a sustain electrode; and a rear substrate comprising a barrier rib for forming a discharge cell, wherein the scan electrode and the sustain electrode comprise a plurality of projecting electrode parts in the discharge cell.  
         [0044]     The projecting electrode part comprises a first projecting electrode part and a second projecting electrode part.  
         [0045]     The first projecting electrode part is disposed between the second projecting electrode parts.  
         [0046]     The first projecting electrode part comprises at least one projecting electrode.  
         [0047]     The second projecting electrode part comprises at least two projecting electrodes.  
         [0048]     A first gap between the first projecting electrode part of the scan electrode and the first projecting electrode part of the sustain electrode is greater than a second gap between the second projecting electrode part of the second projecting electrode part of the scan electrode and the Sustain electrode.  
         [0049]     A plasma display panel panel according to another aspect of the present invention comprises a front substrate comprising a scan electrode and a sustain electrode; and a rear substrate comprising a barrier rib for forming a discharge cell, wherein each of the scan electrode and the sustain electrode comprises a plurality of projecting scan electrode parts and a plurality of projecting sustain electrode parts in the discharge cell, wherein the gap between the projecting scan electrode part and the projecting sustain electrode part confronting the projecting scan electrode comprises at least two different gaps.  
         [0050]     The projecting scan electrode part comprises a first projecting scan electrode part including at least two projecting scan electrode formed in parallel each other; and a second projecting scan electrode part, formed between the first projecting scan electrodes, including at least one projecting scan electrode, while the projecting sustain electrode part comprises a first projecting sustain electrode part including at least two projecting sustain electrode formed in parallel each other; and a second projecting sustain electrode part, formed between the first projecting sustain electrodes, including at least one projecting sustain electrode.  
         [0051]     A first gap between the first projecting scan electrode part and the first projecting sustain electrode part is different from a second gap between the second projecting scan electrode part and the second projecting sustain electrode part.  
         [0052]     The first gap is smaller than the second gap.  
         [0053]     The length of the first projecting scan electrodes are substantially identical.  
         [0054]     The length of the first projecting sustain electrodes are substantially identical.  
         [0055]     The second gap ranges from 1 times to 5 times in comparision with the first gap.  
         [0056]     The second gap ranges from 1.5 times to 3 times in comparision with the first gap.  
         [0057]     A plasma display panel according to still another aspect of the present invention comprises a front substrate comprising a scan electrode and a sustain electrode; and a rear substrate comprising a barrier rib for forming a discharge cell, wherein one of the scan electrode and the sustain electrode comprises a first electrode part; and a plurality of second electrode part protruding from the first electrode part.  
         [0058]     The second electrode part is formed within one discharge cell.  
         [0059]     The second electrode part comprises a second projecting electrode part including at least two projecting electrodes formed in parallel; and a first projecting electrode part, formed between the second projecting electrodes, including at least one projecting electrode, wherein the lenth of the first projecting electrode part is different from the length of the second projecting electrode part.  
         [0060]     The length of the first projecting electrode part is smaller than the length of the second projecting electrode part.  
         [0061]     Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the attached drawings.  
         [0062]      FIG. 5  is a plane view showing the electrode structure within the discharge cell of the plasma display panel according to an embodiment of the present invention.  
         [0063]     As shown in  FIG. 5 , an electrode within the discharge cell of the plasma display panel is comprised of the scan electrode  30  and the sustain electrode  40  including the pair of the transparent electrode a and the bus electrode b.  
         [0064]     The scan electrode  30  and the sustain electrode  40  are arranged in parallel to face each other, while the transparent electrode a of the scan electrode  30  and the sustain electrode  40  have a plurality of the electrode part  300 ,  302  protruding into the inner side.  
         [0065]     The electrode part  300 ,  302  of the scan electrode  30  and the sustain electrode  40  are formed with a first discharge electrode part  300  including one electrode and a second discharge electrode part  302  including two electrodes in one discharge cell, however, it is not restricted in such pattern.  
         [0066]     That is, the first discharge electrode part  300  and the second discharge electrode part  302  including two electrodes is a projecting electrode which performs readily a discharge between the scan electrode  30  and the sustain electrode  40 .  
         [0067]     The gap of the first discharge electrode part  300  is different from the gap of the second discharge electrode part  302 . The gap g 2  between the first discharge electrode parts  300  or gaps g 1 , g 3  between the second discharge electrode parts  302  are identical respectively, while the gap of the first discharge electrode part  300  is different from the gap of the second discharge electrode part  302 .  
         [0068]     At this time, the gap g 2  between the first discharge electrode parts  300  is larger than gaps g 1 , g 3  between the second discharge electrode parts  302 . For example, the gap g 2  between the first discharge electrode part  300  may be greater 1 to 5 times, further, 1.5 to 3 times than the gaps g 1 , g 3  between the second discharge electrode part  302 .  
         [0069]     The present invention is effective just when the gap g 2  between the first discharge electrode part  300  is greater 1 times than gaps g 1 , g 3  between the second discharge electrode part  302 . Moreover, there is a problem that the discharge voltage between Y and Z drastically rises if the gap g 2  between the first discharge electrode part  300  is less 5 times than the gaps g 1 , g 3  between the second discharge electrode part  302 .  
         [0070]     Preferably, the gap g 2  between the first discharge electrode part  300  may be greater 1.5 to 3 times than the gaps g 1 , g 3  between the second discharge electrode part  302 . Only when the gap g 2  between the first discharge electrode part  300  is greater over 1.5 times than gaps g 1 , g 3  between the second discharge electrode part, then, the discharge between the first discharge electrode part and the second discharge electrode part is uniformly generated. Additionally, there is a problem that if the gap g 2  between the first discharge electrode part  300  is greater 3 times than gaps g 1 , g 3  between the second discharge electrode part  302 , then, the discharge between the first discharge electrode part and the second discharge electrode part is unevenly formed, furthermore, the discharge voltage between the first discharge electrode part and the second discharge electrode part increases.  
         [0071]     It is described that the cross section of the end of the first discharge electrode part  300  and the second discharge electrode part  302  are formed as square shape.  
         [0072]     In this way, the operation of the example embodiment of the present invention will be described.  
         [0073]     As described in the above, as to the plasma display panel, a discharge generation is initiated in the intermediate region of the transparent electrode line width, while the discharges are more strongly generated in the bus electrode b than in the intermediate region of the transparent electrode line width.  
         [0074]     Generally, if the gap between the electrodes generating discharges is small, it is possible that strong discharges can be occurred with a small driving voltage. Accordingly, by forming gaps g 1 , g 3 , between the second discharge electrode part  302  in which relatively weak discharge occurs, to be of a small size in comparision with the first discharge electrode part  300  in which the strong discharge is generated, thereby more strong discharge can be generated in the second discharge electrode part  302 .  
         [0075]     At the same time, as described above, the gap g 2 , between the first discharge electrode part  300  in which strong discharge is generated, is formed into a big size so that discharges are equally generated with the second discharge electrode part  302 . Thus, a stable discharge, as a whole, is induced to efficiently implement a white balance.  
         [0076]     Moreover, the gap g 2  between the first discharge electrode part  300  is formed with a big size. Accordingly, the discharge area can be widened and the positive column region can be efficiently used. The more detailed description will be followed in  FIG. 6 .  
         [0077]      FIG. 6  is a drawing illustrating the discharge area in the present invention.  
         [0078]     As shown in  FIG. 6 , if a voltage is applied to the cathode and the anode, the secondary electrons generated and emitted by the cathode collision of the ions are accelerated by the electric field, generating a new electron is generated due to a collision with a neutral particle.  
         [0079]     If the change of a voltage is big, the secondary electron is more strongly accelerated in the negative glow region where the magnitude of the electric field is a relatively great. The electronics generated by a collision continuously obtains the energy in the state where the ionization proceeds on, reaching the positive column region. However, the electronics generated by the collision is not any more able to obtain the energy from the positive column region, delivering the energy through a collision to the neutral particle. In this process, while excited particles fall down to the equilibrium state, the visible rays and the vacuum ultraviolet ray are generated.  
         [0080]     In the positive column region among the discharge area, an emitting light is happened not by the electric field but by exciting only the gas having high energy.  
         [0081]     Moreover, while the ionization nearly does not occur in the positive column, the radiation by an activating is very much generated, so that the efficiency in transforming the energy into the light is high.  
         [0082]     Therefore, the positive column described above can be efficiently used by forming the gap g 2 , between the first discharge electrode part  300  in the discharge cell of the plasma display panel, to be great to broaden the distance between the transparent electrodes of the scan electrode  30  and the sustain electrode  40 .  
         [0083]     In the above description, it was only illustrated that the scan electrode  30  and the sustain electrode  40  were formed with one first discharge electrode part  300  and two second discharge electrode part  302  in one discharge cell, however, it is not restricted in such an embodiment.  
         [0084]     That is, it is possible for the first discharge electrode part  300  and the second discharge electrode part  302  to implement with a plurality of electrodes, or at least one electrode in one discharge cell. An example of the above description is illustrated in  FIG. 7 .  
         [0085]      FIG. 7  is a plane view showing the electrode structure within the discharge cell of the plasma display panel according to another embodiment of the present invention.  
         [0086]     As shown in  FIG. 7 , the scan electrode  30  and the sustain electrode  40  may be implemented with a first discharge electrode part  300  including two electrodes and a second discharge electrode part  302  including two electrodes in one discharge cell. However, the number of the first discharge electrode part  300  and the second discharge electrode part  302  can be decided by considering the characteristics of the discharge of one discharge cell.  
         [0087]     That is, the first discharge electrode part  300  may be implemented to include a plurality of projecting electrodes, or two and over projecting electrodes. Therefore, as shown in  FIG. 7 , the first discharge electrode part  300  include two projecting electrodes, however, it may be implemented to include three and over projecting electrodes  
         [0088]     In the meantime, each gap of the first discharge electrode part  300  and the second discharge electrode part  302  is identical with the drawing illustrated in  FIG. 5 . In other words, the gap between the first discharge electrode parts  300  including a plurality of projecting electrode is uniform, being greater than the gap between the second discharge electrode part  302 . Accordingly, it is possible to easily perform a discharge. In the meantime, as described above, the gap g 2  between the first discharge electrode part  300  may be greater 1 to 5 times, further, 1.5 to 3 times than the gaps g 1 , g 3  between the second discharge electrode part  302 .  
         [0089]     As described above, the present invention is effective just when the gap g 2  between the first discharge electrode part  300  is greater 1 times than gaps g 1 , g 3  between the second discharge electrode part  302 . Moreover, there is a problem that the discharge voltage between Y and Z drastically rises if the gap g 2  between the first discharge electrode part  300  is less 5 times than the gaps g 1 , g 3  between the second discharge electrode part  302 .  
         [0090]     Preferably, the gap g 2  between the first discharge electrode part  300  may be greater 1.5 to 3 times than the gaps g 1 , g 3  between the second discharge electrode part  302 . Only when the gap g 2  between the first discharge electrode part  300  is greater over 1.5 times than gaps g 1 , g 3  between the second discharge electrode part, then, the discharge between the first discharge electrode part and the second discharge electrode part is uniformly generated. Additionally, there is a problem that if the gap g 2  between the first discharge electrode part  300  is greater 3 times than gaps g 1 , g 3  between the second discharge electrode part  302 , then, the discharge between the first discharge electrode part and the second discharge electrode part is unevenly formed, furthermore, the discharge voltage between the first discharge electrode part and the second discharge electrode part increases.  
         [0091]     It was described that the cross section of the end of the first discharge electrode part  300  and the second discharge electrode part  302  are formed as square shape, however, it is not restricted in such pattern, but it is possible to implement it as one of a shape of a polygon or a circular.  
         [0092]      FIG. 8  is a plane view showing the electrode structure within the discharge cell of the plasma display panel according to still another embodiment of the present invention.  
         [0093]     As shown in  FIG. 8 , an electrode within the discharge cell of the plasma display panel is comprised of the scan electrode  10  and the sustain electrode  20  including the pair of the transparent electrode a and the bus electrode b.  
         [0094]     The scan electrode  10  and the sustain electrode  20  are arranged in parallel to face each other, while the transparent electrode a of the scan electrode  10  and the sustain electrode  20  have a plurality of the electrode part  500 ,  502  protruding into the inner side.  
         [0095]     The electrode part  500 ,  502  of the scan electrode  10  and the sustain electrode  20  are formed with a first discharge electrode part  500  including one electrode and a second discharge electrode part  502  including two electrodes in one discharge cell, however, it is not restricted in such pattern.  
         [0096]     That is, the first discharge electrode part  500  and the second discharge electrode part  502  including two electrodes is a projecting electrode which performs readily a discharge between the scan electrode  10  and the sustain electrode  20 .  
         [0097]     The gap of the first discharge electrode part  500  is different from the gap of the second discharge electrode part  502 . The gap g 2  between the first discharge electrode parts  500  or gaps g 1 , g 3  between the second discharge electrode parts  502  are identical respectively, while the gap of the first discharge electrode part  500  is different from the gap of the second discharge electrode part  502 .  
         [0098]     At this time, the gap g 2  between the first discharge electrode parts  500  is larger than gaps g 1 , g 3  between the second discharge electrode parts  502 . For example, the gap g 2  between the first discharge electrode part  500  may be greater 1 to 5 times, further, 1.5 to 3 times than the gaps g 1 , g 3  between the second discharge electrode part  502 .  
         [0099]     The present invention is effective just when the gap g 2  between the first discharge electrode part  500  is greater  1  times than gaps g 1 , g 3  between the second discharge electrode part  502 . Moreover, there is a problem that the discharge voltage between Y and Z drastically rises if the gap g 2  between the first discharge electrode part  500  is less 5 times than the gaps g 1 , g 3  between the second discharge electrode part  502 .  
         [0100]     Preferably, the gap g 2  between the first discharge electrode part  500  may be greater 1.5 to 3 times than the gaps g 1 , g 3  between the second discharge electrode part  502 . Only when the gap g 2  between the first discharge electrode part  500  is greater over 1.5 times than gaps g 1 , g 3  between the second discharge electrode part, then, the discharge between the first discharge electrode part and the second discharge electrode part is uniformly generated. Additionally, there is a problem that if the gap g 2  between the first discharge electrode part  500  is greater 3 times than gaps g 1 , g 3  between the second discharge electrode part  502 , then, the discharge between the first discharge electrode part and the second discharge electrode part is unevenly formed, furthermore, the discharge voltage between the first discharge electrode part and the second discharge electrode part increases.  
         [0101]     It is preferable that the cross section of the end of the first discharge electrode part  500  and the second discharge electrode part  502  are formed as square shape.  
         [0102]     In the meantime, in the still another embodiment of the present invention, it includes a first barrier rib  503 , a second barrier rib  504  which are disposed in parallel with or vertical with the bus electrode  10   b  of the scan electrode  10  and the sustain electrode  20 . The first discharge electrode part  500  and the second discharge electrode part  502  protruded from the scan electrode  10  and the sustain electrode  20  are formed in parallel with the first barrier rib  503 .  
         [0103]     The plasma display panel according to the still another embodiment is also applicable in case that it employs the barrier rib structure of the stripe type. It is noted that the barrier rib is formed only in one direction.  
         [0104]     In  FIG. 8 , it is illustrated that the first discharge electrode part  500  and the second discharge electrode part  502  are partially overlapped with the first barrier rib  503 . However, the first discharge electrode part  500  and the second discharge electrode part  502  can be implemented so that they may be completely-overlapped with the first barrier rib  503 .  
         [0105]     In this case, the width W 1  of the first barrier  503  illustrated in  FIG. 8  is greater than the width W 2  of the second discharge electrode part  502 . Accordingly, as described in the above, it is possible that the first discharge electrode part  500  and the second discharge electrode part  502  can be completely overlapped with the first barrier rib  503 . Additionally, the width W 2  of the first discharge electrode part  500  is identical with the second discharge electrode part  502 .  
         [0106]      FIG. 9  is a plane view showing the electrode structure within the discharge cell of the plasma display panel according to still another embodiment of the present invention.  
         [0107]     As shown in  FIG. 9 , the scan electrode  30  and the sustain electrode  40  may be implemented with a first discharge electrode part  700  including two electrodes and a second discharge electrode part  702  including two electrodes in one discharge cell. However, the number of the first discharge electrode part  700  and the second discharge electrode part  702  can be decided by considering the characteristics of the discharge of one discharge cell.  
         [0108]     That is, the first discharge electrode part  700  may be implemented to include a plurality of projecting electrodes, or two and over projecting electrodes. Therefore, as shown in  FIG. 9 , the first discharge electrode part  700  include two projecting electrodes, however, it may be implemented to include three and over projecting electrodes  
         [0109]     In the meantime, each gap of the first discharge electrode part  700  and the second discharge electrode part  702  is the same as described above. In other words, the gap between the first discharge electrode parts  700  including a plurality of projecting electrode is uniform, being greater than the gap between the second discharge electrode part  702 . Accordingly, it is possible to easily perform a discharge. In the meantime, as described above, the gap g 2  between the first discharge electrode part  700  may be greater 1 to 5 times, further, 1.5 to 3 times than the gaps g 1 , g 3  between the second discharge electrode part  702 .  
         [0110]     As described above, the present invention is effective just when the gap g 2  between the first discharge electrode part  700  is greater 1 times than gaps g 1 , g 3  between the second discharge electrode part  702 . Moreover, there is a problem that the discharge voltage between Y and Z drastically rises if the gap g 2  between the first discharge electrode part  700  is less 5 times than the gaps g 1 , g 3  between the second discharge electrode part  702 .  
         [0111]     Preferably, the gap g 2  between the first discharge electrode part  700  may be greater 1.5 to 3 times than the gaps g 1 , g 3  between the second discharge electrode part  702 . Only when the gap g 2  between the first discharge electrode part  700  is greater over 1.5 times than gaps g 1 , g 3  between the second discharge electrode part, then, the discharge between the first discharge electrode part and the second discharge electrode part is uniformly generated. Additionally, there is a problem that if the gap g 2  between the first discharge electrode part  700  is greater 3 times than gaps g 1 , g 3  between the second discharge electrode part  702 , then, the discharge between the first discharge electrode part and the second discharge electrode part is unevenly formed, furthermore, the discharge voltage between the first discharge electrode part and the second discharge electrode part increases.  
         [0112]     It was described that the cross section of the end of the first discharge electrode part  700  and the second discharge electrode part  702  are formed as square shape, however, it is not restricted in such pattern, but it is possible to implement it as one of a shape of a polygon or a circular.  
         [0113]     In the meantime, in the still another embodiment of the present invention, in  FIG. 8 , as described in the above, it includes a first barrier rib  703  and a second barrier rib  704  formed in parallel with or vertical with the bus electrode  30   b ,  40   b  of the scan electrode  30  and the sustain electrode  40 . The first barrier rib  703  and the second barier rib  704  protruded from the scan electrode  30  and the sustain electrode  40  is formed parallel to the first barrier rib  703 .  
         [0114]     As described in the above, the first discharge electrode part  700  and the second discharge electrode part  702  can be partly overlapped with the first barrier rib  703 , further, can be completely overlapped.  
         [0115]     The width W 3  of the first barrier  703  illustrated in  FIG. 9  is greater than the width W 4  of the first discharge electrode part  700  and the second discharge electrode part  702 . Accordingly, as described in the above, it is possible that the first discharge electrode part  700  and the second discharge electrode part  702  are completely overlapped with the first barrier rib  703 .  
         [0116]      FIG. 10  is a plane view showing the electrode structure within the discharge cell of the plasma display panel according to still another embodiment of the present invention.  
         [0117]     As shown in  FIG. 9 , in the still another embodiment of the present invention, as described in the above, it includes a first barrier rib  903  and a second barrier rib  904  formed in parallel with or vertical with the bus electrode  50   b ,  60   b  of the scan electrode  50  and the sustain electrode  60 . The first barrier rib  903  and the second barier rib  904  protruded from the scan electrode  50  and the sustain electrode  60  is formed parallel to the first barrier rib  903 .  
         [0118]     That is, while the still another embodiment of the present invention has the electrode structure identical with the electrode structure illustrated in  FIG. 9 . However, it has a difference in that the first barrier rib  903  and the second discharge electrode part  902  are not overlapped. In conclusion, regardless of the location of a barrier rib, the present invention is capable of performing a stable discharge by appropriately controlling an interval between the protruded electrodes from the scan electrode and the sustain electrode.  
         [0119]     It will be apparent to those skilled in the art that various modifications and variation can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.