Patent Publication Number: US-7911416-B2

Title: Plasma display panel

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a divisional application of U.S. patent application Ser. No. 10/867,857 filed on Jun. 14, 2004, which claims priority to and the benefit of Korea Patent Applications: No. 2003-0041491 filed on Jun. 25, 2003, No. 2003-0044861 filed on Jul. 3, 2003, No. 2003-0050278 filed on Jul. 22, 2003, No. 2003-0052598 filed on Jul. 30, 2003, No. 2003-0053461 filed on Aug. 1, 2003, No. 2003-0073518 filed on Oct. 21, 2003 and No. 2003-0073519 filed on Oct. 21, 2003, all in the Korean Intellectual Property Office, the entire content of which are incorporated herein by reference. 
    
    
     BACKGROUND OF THE INVENTION 
     (a) Field of the Invention 
     The present invention relates to a plasma display panel (PDP), and more particularly, to a plasma display panel having a structure preventing the reflection of external light to improve screen contrast. 
     (b) Description of the Related Art 
     A PDP is typically a display device in which vacuum ultraviolet rays generated by the discharge of gas occurring in discharge cells excite phosphors to realize predetermined images. As a result of the high resolution possible with PDPs (even with large screen sizes), many believe that they will become a major, next generation flat panel display configuration. 
     In a conventional PDP, with reference to  FIG. 24 , address electrodes  101  are formed along one direction (direction X in the drawing) on rear substrate  100 . Dielectric layer  103  is formed over an entire surface of rear substrate  100  on which address electrodes  101  are located such that dielectric layer  103  covers address electrodes  101 . Barrier ribs  105  are formed on dielectric layer  103  in a striped pattern and at locations corresponding to between address electrodes  101 . Formed between barrier ribs  105  are red, green, and blue phosphor layers  107 . 
     Formed on a surface of front substrate  110  facing rear substrate  100  are discharge sustain electrodes  112 ,  113  realized through a pair of transparent electrodes and bus electrodes  113 . Discharge sustain electrodes  112 ,  113  are arranged in a direction substantially perpendicular to address electrodes  101  of rear substrate  100  (direction Y). Dielectric layer  116  is formed over an entire surface of front substrate  110  on which discharge sustain electrodes  112 ,  113  are formed such that dielectric layer  116  covers discharge sustain electrodes  114 . MgO protection layer  118  is formed covering entire dielectric layer  116 . 
     Areas between where address electrodes  101  of rear substrate  100  and discharge sustain electrodes  112 ,  113  of front substrate  110  intersect become areas that form discharge cells. Each of the discharge cells are filled with discharge gas. 
     An address voltage Va is applied between address electrodes  101  and one of discharge sustain electrodes  112 ,  113  to perform address discharge and thereby select discharge cells in which illumination is to occur, then a sustain voltage Vs is applied between a pair of the discharge sustain electrodes  112 ,  113  to perform sustain discharge. Vacuum ultraviolet rays (VUV) generated at this time excite corresponding phosphor layers such that visible light is emitted through transparent front substrate  110  to realize the display of images. 
     The PDP operating in this manner has a bright room contrast and a dark room contrast to a level exhibiting a contrast ratio. Bright room contrast refers to the contrast when a light source of 150 lux or greater exists to the exterior of the panel and the PDP receives the affect of the external light. Dark room contrast refers to the contrast when a light source of 21 lux or less exists to the exterior of the panel and the PDP receives no substantial affect of the external light. 
     In conventional PDPs, front substrate  110  is made of a transparent glass material such that the reflection of external light is unavoidable. The reflection of external light occurs when light from outside the panel passes through front substrate  110 , reaches the discharge cells, and is reflected on phosphor layers  107  or dielectric layer  116 . External light also reflects directly on an outer surface of front substrate  110 . 
     In the case where external light passes through front substrate  110  to be reflected on either phosphor layers  107  or dielectric layer  116 , the brightness of black display is increased. This reduces the dark room contrast of the screen. When external light is reflected directly from the outer surface of front substrate  116 , part of the screen is shielded and therefore cannot be seen. This causes a decrease in the bright room contrast of the screen. 
     Accordingly, a light shielding film is formed between the discharge sustain electrodes  112 ,  113  of the conventional PDP such that light entering through front substrate  110  is blocked and prevented from being reflected. This is a common configuration used in PDPs. U.S. Pat. Nos. 5,952,782 and 6,200,182 disclose PDPs using such light shielding films between the front substrate and the phosphor layers. 
     However, with the mounting of light shielding films on the inner surface of the front substrate and therefore adjacent to areas of discharge, the material in the light shielding films used to block light negatively affects the discharge operation so that discharge does not occur normally. Further, the light shielding films are unable to prevent reflection from the outer surface of the front substrate. This may cause problems (i.e., significant reflection) when the PDP is placed in a room using fluorescent lights or other such high-intensity lighting, thereby being unable to prevent a reduction in bright room contrast. 
     Color characteristics of red, green, and blue phosphor layers determine the color temperature of the screen. The phosphors of these different color layers used in conventional systems have differing phosphor efficiencies and therefore varying brightness ratios. Accordingly, in order to improve color temperature, it is necessary to compensate for the phosphor with the lowest brightness ratio among these three colors of phosphors. 
     The typical method used to perform such color compensation in conventional PDPs is to perform gamma compensation so that peak values for the different colors are reduced. This is performed prior to digitizing analog image signals for the colors that do not have the lowest brightness ratios, for example, the red and green colors (assuming for the sake of this example that blue has the lowest brightness ratio). Therefore, the number of sustain pulses, which indicate maximum brightnesses of red and green, is reduced to below the number for blue. Further, the discharge cells containing the phosphor layers of the color exhibiting the lowest brightness ratio are made the largest, while the volumes for the discharge cells containing the phosphor layer of the other two colors are reduced in size. This further improves color temperature. 
     However, in the method utilizing gamma compensation described above, not all 255 sustain pulses needed for maximum green and red brightness are used. As a result, for images that gradually become bright or dark, green and red colors in the images realize such changes in increments and not in a gradual manner. Further, with the use of discharge cells of differing sizes, the likelihood of mis-discharge occurring increases, and a voltage margin, needed for stable driving, decreases. 
     SUMMARY OF THE INVENTION 
     In accordance with the present invention, a plasma display panel is provided that improves screen contrast by effectively preventing the reflection of external light from an outer surface of a front substrate while not causing any abnormalities in illumination in discharge cells. 
     Further, in accordance with the present invention, a plasma display panel is provided in which an internal structure of the panel is improved such that an area of external light absorption is increased or external light reflection is minimized, thereby enhancing bright room contrast of the screen. 
     In addition, in accordance with the present invention, a plasma display panel is provided that compensates for a color, among red, green, and blue colors, having the lowest brightness ratio to thereby improve color temperature and prevent external light reflection so that a dark/bright ratio is improved. 
     A plasma display panel includes a first substrate and a second substrate provided opposing one another with a predetermined gap therebetween. Address electrodes are formed on the second substrate. Barrier ribs are mounted between the first substrate and the second substrate, the barrier ribs defining a plurality of discharge cells and a plurality of non-discharge regions. A phosphor layer is formed within each of the discharge cells. Discharge sustain electrodes are formed on the first substrate in a direction intersecting the address electrodes. The non-discharge regions are formed in areas encompassed by discharge cell abscissas that pass through centers of adjacent discharge cells and discharge cell ordinates that pass through centers of adjacent discharge cells. The non-discharge regions are at least as large as distal ends of the barrier ribs forming the discharge cells. External light absorbing members are formed between the second substrate and the barrier ribs layer at areas corresponding to locations of the non-discharge regions. 
     The external light absorbing members have a planar shape that is similar to a planar shape of the non-discharge regions. 
     The barrier ribs defining adjacent discharge cells form the non-discharge regions into a cell structure. The non-discharge regions are formed by the barrier ribs separating diagonally adjacent discharge cells. 
     Each of the discharge cells is formed such that ends of the discharge cells gradually decrease in width along a direction the discharge sustain electrodes are formed as a distance from a center of the discharge cells is increased along a direction the address electrodes are formed. Also, the barrier ribs comprise first barrier rib members formed substantially parallel the direction of the address electrodes. Second barrier rib members are connected to the first barrier rib members and formed in a direction that is oblique to the direction of the address electrodes. The second barrier rib members are formed at a predetermined angle to the direction the address electrodes are formed to intersect over the address electrodes. 
     The external light absorbing members are adjacent to the dielectric layer. 
     The external light absorbing members may be formed on the dielectric layer. Also, grooves may be formed in the dielectric layer at areas corresponding to the location of the non-discharge regions, and the external light absorbing members may be positioned in the grooves. The external light absorbing members may be formed of black films. 
     The external light absorbing members may be realized by forming areas of the dielectric layer corresponding to locations of the non-discharge regions as tinted sections that are able to absorb external light. 
     The tinted sections are made of one of black coloring, blue coloring, and a mixture of black coloring and blue coloring. The black coloring is selected from the group consisting of FeO, RuO 2 , TiO, Ti 3 O 5 , Ni 2 O 3 , CrO 2 , MnO 2 , Mn 2 O 3 , Mo 2 O 3 , Fe 3 O 4 , and any combination of these compounds. The blue coloring is selected from the group consisting of Co 2 O 3 , CoO, Nd 2 O 3 , and any combination of these compounds. 
     Each of the discharge sustain electrodes includes bus electrodes that extend such that a pair of the bus electrodes is provided for each of the discharge cells. Protrusion electrodes are formed extending from each of the bus electrodes such that a pair of opposing protrusion electrodes is formed within areas corresponding to each discharge cell. The protrusion electrodes are formed such that proximal ends decrease in width along a direction the discharge sustain electrodes are formed as a distance from a center of the discharge cells is increased along a direction the address electrodes are formed. A distal end of each of the protrusion electrodes opposite proximal ends connected to and extended from the bus electrodes is formed including an indentation. A first discharge gap and a second discharge gap of different sizes are formed between distal ends of opposing protrusion electrodes. 
     The discharge cells may be filled with discharge gas containing 10% or more Xenon, or containing 10-60% Xenon. 
     The discharge sustain electrodes include scan electrodes and display electrodes provided such that one scan electrode and one display electrode correspond to each row of the discharge cells, the scan electrodes and the display electrodes including protrusion electrodes that extend into the discharge cells while opposing one another. The protrusion electrodes are formed such that a width of proximal ends thereof is smaller than a width of distal ends of the protrusion electrodes. The address electrodes include line regions formed along a direction the address electrodes are formed. Enlarged regions are formed at predetermined locations and expand along a direction substantially perpendicular to the direction of the line regions to correspond to the shape of protrusion electrodes of the scan electrodes. 
     The enlarged regions of the address electrodes are formed to a first width at areas opposing the distal ends of the protrusion electrodes, and to a second width that is smaller than the first width at areas opposing the proximal ends of the protrusion electrodes. 
     The discharge sustain electrodes include scan electrodes and display electrodes provided such that one scan electrode and one display electrode correspond to each row of the discharge cells. Each of the scan electrodes and display electrodes includes bus electrodes extended along a direction substantially perpendicular to the direction the address electrodes are formed. Protrusion electrodes extend into the discharge cells from the bus electrodes such that the protrusion electrodes of the scan electrodes oppose the protrusion electrodes of the display electrodes. One of the bus electrodes of the display electrodes is mounted between adjacent discharge cells of every other row of the discharge cells. The bus electrodes of the scan electrodes are mounted between adjacent discharge cells and between the bus electrodes of the display electrodes. 
     The protrusion electrodes of the display electrodes are extended from the bus electrodes of the display electrodes into discharge cells adjacent to opposite sides of the bus electrodes. The bus electrodes of the display electrodes have a width that is greater than a width of the bus electrodes of the scan electrodes. 
     A method is provided for manufacturing a plasma display panel having a plasma discharge structure defining non-discharge regions and discharge cells between a first substrate and a second substrate. The method includes forming address electrodes on a surface of the second substrate opposing the first substrate; forming a dielectric layer on the second substrate covering the address electrodes; forming external light absorbing members adjacent to the dielectric layer and at areas corresponding to locations of the non-discharge regions; forming barrier ribs on the dielectric layer such that the barrier ribs define the discharge cells and the non-discharge regions; and forming a phosphor layer within each of the discharge cells. 
     The forming external light absorbing members includes depositing black coloring on the dielectric layer, or forming grooves in the dielectric layer at areas corresponding to where the non-discharge regions are to be formed, and depositing black coloring in the grooves. 
     In another embodiment, a plasma display panel includes a first substrate and a second substrate provided opposing one another with a predetermined gap therebetween. Address electrodes are formed on the second substrate. Barrier ribs are mounted between the first substrate and the second substrate, the barrier ribs defining a plurality of discharge cells and a plurality of non-discharge regions. A phosphor layer is formed within each of the discharge cells; and discharge sustain electrodes formed on the first substrate in a direction intersecting the address electrodes. The non-discharge regions are formed in areas encompassed by discharge cell abscissas that pass through centers of adjacent discharge cells and discharge cell ordinates that pass through centers of adjacent discharge cells. The non-discharge regions are at least as large as distal ends of the barrier ribs forming the discharge cells. External light absorbing members are formed on an outer surface of the first substrate at areas corresponding to locations of the non-discharge regions. 
     Grooves are formed to a predetermined depth in the outer surface of the first substrate at areas corresponding to the location of the non-discharge regions. Light absorbing material is filled in the grooves. In one embodiment, the predetermined depth is 100-300 μm. In one embodiment, the light absorbing material is black. 
     In yet another embodiment, a plasma display panel includes a first substrate and a second substrate provided opposing one another with a predetermined gap therebetween. Address electrodes are formed on the second substrate. Barrier ribs mounted between the first substrate and the second substrate, the barrier ribs defining a plurality of discharge cells and a plurality of non-discharge regions. A red, green, or blue phosphor layer is formed within each of the discharge cells. Discharge sustain electrodes are formed on the first substrate in a direction intersecting the address electrodes. The non-discharge regions are formed in areas encompassed by discharge cell abscissas that pass through centers of adjacent discharge cells and discharge cell ordinates that pass through centers of adjacent discharge cells. The non-discharge regions are at least as large as distal ends of the barrier ribs forming the discharge cells. Color compensating members have a coloration corresponding to a color of the phosphor layers having the lowest brightness ratio among the three colors of the phosphor layers, the color compensating members being formed at areas corresponding to locations of the non-discharge regions, and at one of the locations of on the first substrate, and between the first substrate and the second substrate. 
     The color compensating members include one of red coloration, green coloration, and blue coloration. 
     The color compensating members are formed on an inner surface of the first substrate, or in the non-discharge regions. 
     Barrier ribs defining adjacent discharge cells form the non-discharge regions into a cell structure, and the color compensating members are formed within the cells forming the non-discharge regions. 
     The color compensating members may be formed on an inner surface of the first substrate and in the non-discharge regions, or on an outer surface of the first substrate. 
     The color compensating members include grooves formed to a predetermined depth in an outer surface of the first substrate, and color layers filled in the grooves. In one embodiment, the predetermined depth is 100-300 μm. 
     The color compensating members have a planar shape that is similar to a planar shape of the non-discharge regions. In one embodiment, the color compensating members have a combined area that is 50% or less an area of the first substrate. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a partial exploded perspective view of a plasma display panel according to a first embodiment of the present invention. 
         FIG. 2  is a partial plan view of the plasma display panel of  FIG. 1 . 
         FIG. 3  is a sectional view taken along line A-A of  FIG. 1 . 
         FIG. 4  is a sectional view taken along line B-B of  FIG. 1 . 
         FIG. 5  is a sectional view of a modified example of the plasma display panel of  FIG. 1 . 
         FIGS. 6-10  are schematic views used to describe manufacture of the plasma display panel of  FIG. 1 , where  FIG. 6   b  is a sectional view taken along line C-C of  FIG. 6   a , and  FIG. 7   b  is a sectional view taken along line D-D of  FIG. 7   a.    
         FIG. 11  is a partial exploded perspective view of a plasma display panel according to a second embodiment of the present invention. 
         FIG. 12  is a sectional view taken along line E-E of  FIG. 11 . 
         FIG. 13  is a partial plan view of a plasma display panel according to a third embodiment of the present invention. 
         FIG. 14  is a partial exploded perspective view of a plasma display panel according to a fourth embodiment of the present invention. 
         FIG. 15  is an enlarged partial plan view of one discharge cell of  FIG. 14 . 
         FIG. 16  is a partial plan view of a plasma display panel according to a fifth embodiment of the present invention. 
         FIG. 17  is a partial exploded perspective view of a plasma display panel according to a sixth embodiment of the present invention. 
         FIG. 18  is a sectional view of a front substrate of the plasma display panel of  FIG. 17 . 
         FIG. 19  is a partial exploded perspective view of a plasma display panel according to a seventh embodiment of the present invention. 
         FIG. 20  is a sectional view of a front substrate of the plasma display panel of  FIG. 19 . 
         FIG. 21  is a partial exploded perspective view of a plasma display panel according to an eighth embodiment of the present invention. 
         FIG. 22  is a partial exploded perspective view of a plasma display panel according to a ninth embodiment of the present invention. 
         FIG. 23  is a sectional view of a front substrate of a plasma display panel according to a tenth embodiment of the present invention. 
         FIG. 24  is a partial exploded perspective view of a conventional plasma display panel. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  is a partial exploded perspective view of a plasma display panel according to a first embodiment of the present invention.  FIG. 2  is a partial plan view of the plasma display panel of  FIG. 1 .  FIG. 3  is a sectional view taken along line A-A of  FIG. 1 . 
     A plasma display panel (PDP) according to the first embodiment includes first substrate  2  and second substrate  4  provided substantially in parallel with a predetermined gap therebetween. Non-discharge regions  10  and discharge cells  8 R,  8 G,  8 B are defined by barrier ribs  6  between first substrate  2  and second substrate  4 . 
     A plurality of address electrodes  12  is formed along one direction (direction X in the drawings) on a surface of second substrate  4  opposing first substrate  2 . As an example, address electrodes  12  are formed in a striped pattern with a uniform, predetermined interval between adjacent address electrodes  12 . Dielectric layer  14  is formed on second substrate  4  covering address electrodes  12 . 
     Barrier ribs  6  define the plurality of discharge cells  8 R,  8 G,  8 B, and also non-discharge regions  10  in the gap between first substrate  2  and second substrate  4 . In one embodiment barrier ribs  6  are formed over dielectric layer  14 , which is provided on second substrate  4  as described above. Discharge cells  8 R,  8 G,  8 B designate areas in which discharge gas is provided and where gas discharge is expected to take place with the application of an address voltage and a discharge sustain voltage. Non-discharge regions  10  are areas where a voltage is not applied such that gas discharge (i.e., illumination) is not expected to take place therein. Non-discharge regions  10  are areas that are at least as big as a thickness of barrier ribs  6  in a direction Y. 
     Referring to  FIGS. 1 and 2 , non-discharge regions  10  defined by barrier ribs  6  are formed in areas encompassed by discharge cell abscissas H and ordinates V that pass through centers of each of the discharge cells  8 R,  8 G,  8 B and that are respectively aligned with direction Y and direction X. In one embodiment, non-discharge regions  10  are centered between adjacent abscissas H and adjacent ordinates V. Stated differently, in one embodiment each pair of discharge cells  8 R,  8 G,  8 B adjacent to one another along direction X has a common non-discharge region  10  with another such pair of discharge cells  8 R,  8 G,  8 B adjacent along direction Y. With this configuration realized by barrier ribs  6 , each of the non-discharge regions  10  has an independent cell structure. 
     Barrier ribs  6  define discharge cells  8 R,  8 G,  8 B in a direction of address electrodes  12  (direction X), and in a direction substantially perpendicular to the direction address electrodes  12  are formed (direction Y). Discharge cells  8 R,  8 G,  8 B are formed in a manner to optimize gas diffusion. In particular, each of the discharge cells  8 R,  8 G,  8 B is formed with ends that reduce in width along direction Y as a distance from a center of each of the discharge cells  8 R,  8 G,  8 B is increased in the direction address electrodes  12  are provided (direction X). That is, as shown in  FIG. 1 , a width Wc of a mid-portion of discharge cells  8 R,  8 G,  8 B is greater than a width We of the ends of discharge cells  8 R,  8 G,  8 B with width We of the ends decreasing up to a certain point as the distance from the center of the discharge cells  8 R,  8 G,  8 B is increased. Therefore, in the first embodiment, the ends of discharge cells  8 R,  8 G,  8 B are formed in the shape of a trapezoid (with its base removed) until reaching a predetermined location where barrier ribs  6  close off discharge cells  8 R,  8 G,  8 B. This results in each of the discharge cells  8 R,  8 G,  8 B having an overall planar shape of an octagon. 
     Barrier ribs  6  defining non-discharge regions  10  and discharge cells  8 R,  8 G,  8 B in the manner described above include first barrier rib members  6   a  that are parallel to address electrodes  12 , and second barrier rib members  6   b  that define the ends of discharge cells  8 R,  8 G,  8 B as described above and so are not parallel to address electrodes  12 . In the first embodiment, second barrier rib members  6   b  are formed extending up to a point at a predetermined angle to first barrier rib members  6   a , then extending in direction Y to cross over address electrodes  12 . Therefore, second barrier rib members  6   b  are formed in substantially an X shape between discharge cells  8 R,  8 G,  8 B adjacent along the direction of address electrodes  12 . Second barrier rib members  6   b  can further separate diagonally adjacent discharge cells with a non-discharge region therebetween. 
     Red (R), green (G), and blue (B) phosphors are deposited within discharge cells  8 R,  8 G,  8 B to form phosphor layers  16 R,  16 G,  16 B, respectively. 
     With reference to  FIG. 3 , a depth at both ends of discharge cells  8 R along the direction of address electrodes  12  decreases as the distance from the center of discharge cells  8 R is increased. That is, a depth De at the ends of discharge cells  8 R is less than a depth Dc at the mid-portions of discharge cells  8 R, with the depth De decreasing as the distance from the center is increased along direction X. Discharge cells  8 G,  8 B of the other colors are formed identically to discharge cells  8 R and therefore operate in the same manner. 
     With respect to first substrate  2 , a plurality of discharge sustain electrodes  22  is formed on the surface of first substrate  2  opposing second substrate  4 . Discharge sustain electrodes  22  include scan electrodes  18  and display electrodes  20  extended in a direction (direction Y) substantially perpendicular to the direction (direction X) of address electrodes  12 . Further, dielectric layer  24  is formed over an entire surface of first substrate  2  covering discharge sustain electrodes  22 , and MgO protection layer  26  is formed on dielectric layer  24 . 
     Scan electrodes  18  and display electrodes  20  respectively include bus electrodes  18   a ,  20   a  that are formed in a striped pattern, and protrusion electrodes  18   b ,  20   b  that are formed extended from bus electrodes  18   a ,  20   a , respectively. For each row of discharge cells  8 R,  8 G,  8 B along direction Y, bus electrodes  18   a  are extended into one end of discharge cells  8 R,  8 G,  8 B and bus electrodes  20   a  are extended into an opposite end of discharge cells  8 R,  8 G,  8 B. Therefore, each of discharge cells  8 R,  8 G,  8 B has one of the bus electrodes  18   a  positioned over one end, and one of the bus electrodes  20   a  positioned over its other end. 
     That is, for each row of discharge cells  8 R,  8 G,  8 B along direction Y, protrusion electrodes  18   b  overlap and protrude from corresponding bus electrode  18   a  into the areas of the discharge cells  8 R,  8 G,  8 B. Protrusion electrodes  20   b  overlap and protrude from the corresponding bus electrode  20   a  into the areas of discharge cells  8 R,  8 G,  8 B. Therefore, one protrusion electrode  18   b  and one protrusion electrode  20   b  are formed opposing one another in each area corresponding to each of the discharge cells  8 R,  8 G,  8 B. 
     Proximal ends of protrusion electrodes  18   b ,  20   b  (i.e., where protrusion electrodes  18   b ,  20   b  are attached to and extend from bus electrodes  18   a ,  20   a , respectively) are formed corresponding to the shape of the ends of discharge cells  8 R,  8 G,  8 B. That is, the proximal ends of protrusion electrodes  18   b ,  20   b  reduce in width along direction Y as the distance from the center of discharge cells  8 R,  8 G,  8 B along direction X is increased to thereby correspond to the shape of the ends of discharge cells  8 R,  8 G,  8 B. 
     Protrusion electrodes  18   b ,  20   b  are realized through transparent electrodes having excellent light transmissivity such as ITO (indium tin oxide) electrodes. In one embodiment, a metal such as silver (Ag), aluminum (Al), and copper (Cu) is used for bus electrodes  18   a ,  20   a.    
     External light absorbing members are mounted between second substrate  4  and barrier ribs  6  at areas corresponding to non-discharge regions. The external light absorbing members are provided adjacent to dielectric layer  14  formed on second substrate  4 . In the first embodiment, external light absorbing members  28  are formed on dielectric layer  14  corresponding to the areas of non-discharge regions  10  to thereby minimize reflection brightness of the PDP. 
       FIG. 4  is a sectional view taken along line B-B of  FIG. 1 . External light absorbing members  28  are made of layers that are black or are a dark shade that is close to black in color. As described above, external light absorbing members  28  are positioned between second substrate  4  and barrier ribs  6  on dielectric layer  14 . If desired, external light absorbing members  28  may be provided in grooves  14   a  formed in dielectric layer  14  as shown in  FIG. 5 . If this configuration of  FIG. 5  is used, the difference in heights between dielectric layer  14  and external light absorbing members  28  is removed so that the combined dielectric layer  14  and external light absorbing members  28  is flat. 
     Frit is provided along edges of first substrate  2  and second substrate  4 , and the same are sealed in a state where discharge gas (typically an Ne—Xe compound gas) is filled between first substrate  2  and second substrate  4 . 
     If an address voltage Va is applied between an address electrode  12  and a scanning electrode  18  of a specific discharge cell, for example, a discharge cell  8 R, address discharge occurs in discharge cell  8 R. As a result, a wall charge accumulates on dielectric layer  24 , which covers discharge sustain electrodes  22 , to thereby select the specific discharge cell  8 R. 
     Next, if a sustain voltage Vs is applied between scanning electrode  18  and display electrode  20  of the selected discharge cell  8 R, plasma discharge is initiated in a gap between scanning electrode  18  and display electrode  20 , and VUV rays are emitted by the excitation of Xenon atoms generated during plasma discharge. The VUV rays excite phosphor layer  16 R of discharge cell  8 R to generate visible light and thereby realize predetermined images. 
     Plasma discharge generated by sustain voltage Vs is diffused in approximately an arc shape toward exterior regions of discharge cell  8 R, and is then extinguished. In the first embodiment, each of the discharge cells  8 R,  8 G,  8 B is formed to correspond to such diffusion of plasma discharge. Therefore, effect sustain discharge occurs over the entire regions of discharge cells  8 R,  8 G,  8 B, thereby increasing discharge efficiency. 
     Further, the area of contact with phosphor layers  16 R,  16 G,  16 B with respect to discharge areas is increased as exterior regions of discharge cells  8 R,  8 G,  8 B are approached to thereby increase illumination efficiency. Also, non-discharge regions  10  absorb heat emitted from discharge cells  8 R,  8 G,  8 B, and expel this heat to outside the PDP, thereby enhancing heat discharge characteristics of the PDP. 
     With the mounting of external light absorbing members  28  in the first embodiment, external light entering the PDP through first substrate  2  is absorbed to thereby reduce reflection brightness of the PDP. Ultimately, bright room contrast of the screen is improved. 
     Manufacture of the PDP according to the first embodiment will now be described with reference to  FIGS. 6-10 . 
     Referring first to  FIG. 6 , a conductive paste such as a silver (Ag) paste is printed on second substrate  4  in a stripe pattern. The conductive paste is dried and fired to form address electrodes  12 . Dielectric material is then printed over an entire surface of second substrate  4  on which address electrodes  12  are formed, after which the dielectric material is dried and fired to thereby form dielectric layer  14 . 
     Subsequently, with reference to  FIG. 7 , black paint is deposited on dielectric layer  14  at areas where non-discharge regions are to be formed to thereby form external light absorbing members  28 . As an example, external light absorbing members  28  are formed by first producing a black paste including MnO 2 , a conventional vehicle, an organic binder, and frit, then this black paste is printed on dielectric layer  14 , dried, and fired. 
     In another embodiment, with reference to  FIG. 8 , grooves  14   a  are formed in dielectric layer  14  at areas corresponding to where non-discharge regions are to be formed, then black paint is deposited in grooves  14   a  to form external light absorbing members. 
     Next, with reference to  FIG. 9 , barrier ribs  6  are formed on dielectric layer  14  to thereby define non-discharge regions  10  and discharge cells  8 R,  8 G,  8 B. Barrier ribs  6  may be printed into a desired pattern on dielectric layer  14 , then dried and fired. Alternatively, barrier rib material may be deposited over the entire dielectric layer  14 , after which a sandblasting process is performed to remove select areas and thereby form barrier ribs  6  that define (into a desired pattern) non-discharge regions  10  and discharge cells  8 R,  8 G,  8 B. 
     Referring now to  FIG. 10 , red, green, and blue phosphor material is printed respectively in discharge cells  8 R,  8 G,  8 B, then the phosphor material is dried and fired to form phosphor layers  16 R,  16 G,  16 B. As a result of this and the above processes, phosphor layers  16 R,  16 G,  16 B are positioned respectively in discharge cells  8 R,  8 G,  8 B, and external light absorbing members  28  are positioned on dielectric layer  14  at areas corresponding to non-discharge regions  10 , thereby completing the formation of second substrate  4 . Second substrate  4  is combined with first substrate  2 , on which discharge sustain electrodes, a transparent dielectric layer, and an MgO protection layer are formed, thereby completing the PDP. 
     In the structure of this embodiment in which barrier ribs  6  are formed following the formation of external light absorbing members  28  on dielectric layer  14  as described above, with the formation of external light absorbing members  28  to a predetermined thickness on dielectric layer  14 , areas of barrier ribs  6  on external light absorbing members  28  are higher than other areas of barrier ribs  6  to thereby form a stepped configuration of the same. This aids in the exhaust of the PDP during manufacture. 
       FIG. 11  is a partial exploded perspective view of a plasma display panel according to a second embodiment of the present invention, and  FIG. 12  is a sectional view taken along line E-E of  FIG. 11  in a state where the PDP is assembled. Like reference numerals will be used for elements identical to those of the first embodiment. 
     Dielectric layer  28  of the second embodiment includes tinted sections  28   a  that have the ability to absorb external light. Tinted sections  28   a  are formed corresponding to the location of non-discharge regions  10 . This increases an overall external light absorbing area of the PDP. Tinted sections  28   a  may have one of black coloring or blue coloring, or a mixture of black and blue coloring. As a result of this configuration, areas corresponding to non-discharge regions  10  are darkened. 
     In one embodiment, the black coloring is realized by one of FeO, RuO 2 , TiO, Ti 3 O 5 , Ni 2 O 3 , CrO 2 , MnO 2 , Mn 2 O 3 , Mo 2 O 3 , and Fe 3 O 4 , or an any combination of these compounds; and the blue coloring is realized by one of Co 2 O 3 , CoO, and Nd 2 O 3 , or any combination of these compounds. In the case where tinted sections  28   a  include blue coloration so that non-discharge regions  10  exhibit a blue color, color purity and color temperature of the screen are improved. 
     Dielectric layer  28  including tinted sections  28   a  may be manufactured by first forming tinted sections  28   a  at areas corresponding to where non-discharge regions  10  are to be formed, and then coating remaining areas on second substrate  4  with dielectric material. 
       FIG. 13  is a partial plan view of a plasma display panel according to a third embodiment of the present invention. Like reference numerals will be used for elements identical to those of the first embodiment. 
     In the PDP according to the third embodiment, discharge sustain electrodes  30 ,  31  respectively include bus electrodes  30   a ,  31   a  that are formed along a direction substantially perpendicular to a direction address electrodes  12  are and respectively include protrusion electrodes  30   b ,  31   a  that extend from bus electrodes  30   a ,  31   b  into areas corresponding to discharge cells  8 R,  8 G,  8 B. 
     Distal ends of protrusion electrodes  30   b ,  31   b  are formed such that center areas along direction Y are indented and sections to both sides of the indentations are protruded. Therefore, in each of the discharge cells  8 R,  8 G,  8 B, first discharge gap G 1  and second discharge gap G 2  of different sizes are formed between opposing protrusion electrodes  30   b ,  31   b . That is, second discharge gaps G 2  (or long gaps) are formed where the indentations of protrusion electrodes  30   b ,  31   b  oppose one another, and first discharge gaps G 1  (or short gaps) are formed where the protruded areas to both sides of the indentations of protrusion electrodes  30   b ,  31   b  oppose one another. Accordingly, plasma discharge, which initially occurs at center areas of discharge cells  8 R,  8 G,  8 B, is more efficiently diffused such that overall discharge efficiency is increased. 
     The distal ends of protrusion electrodes  30   b ,  31   b  may be formed with only indented center areas such that protruded sections are formed to both sides of the indentations, or may be formed with the protrusions to both sides of the indentations extending past a reference straight line r formed along direction Y. Further, protrusion electrodes  30   b ,  31   b  providing the pair of the same positioned within each of the discharge cells  8 R,  8 G,  8 B may be formed as described above, or only one of the pair may be formed with the indentations and protrusions. 
     External light absorbing members  38  are mounted between second substrate  4  and barrier ribs  6  at areas corresponding to non-discharge regions  10 . External light absorbing members  38  may be provided adjacent to dielectric layer  14  formed on second substrate  4  as in the first embodiment, or may be realized by the formation of tinted sections  28   a  at locations corresponding to non-discharge regions  10  to thereby increase the overall external light absorbing area of the PDP as in the second embodiment. 
     Discharge sustain electrodes  30 ,  31  are positioned with first and second gaps G 1 , G 2  interposed therebetween to thereby reduce a discharge firing voltage Vf. Accordingly, in the third embodiment, the amount of Xenon contained in the discharge gas may be increased and the discharge firing voltage Vf may be left at the same level. The discharge gas contains 10% or more Xenon. In one embodiment, the discharge gas contains 10˜60% Xenon. With the increased Xenon content, vacuum ultraviolet rays may be emitted with a greater intensity to thereby enhance screen brightness. 
       FIG. 14  is a partial exploded perspective view of a plasma display panel according to a fourth embodiment of the present invention, and  FIG. 15  is an enlarged partial plan view of one discharge cell of  FIG. 14 . Like reference numerals will be used for elements identical to those of previous embodiments. 
     In the PDP according to the fourth embodiment, barrier ribs  6  define non-discharge regions  10  and discharge cells  8 R,  8 G,  8 B as in the first embodiment. Further, discharge sustain electrodes  18 ,  20  are formed along a direction (direction Y) substantially perpendicular to the direction address electrodes  42  are formed. Discharge sustain electrodes  18 ,  20  respectively include bus electrodes  18   a ,  20   a  that extend along the direction address electrodes  42  are formed (direction Y), and protrusion electrodes  18   b ,  20   b  that are extended respectively from bus electrodes  18   a ,  20   a.    
     For each row of discharge cells  8 R,  8 G,  8 B along direction Y, bus electrodes  18   a  are extended along one end of discharge cells  8 R,  8 G,  8 B and bus electrodes  20   a  are extended into an opposite end of discharge cells  8 R,  8 G,  8 B. Therefore, each of the discharge cells  8 R,  8 G,  8 B has one of the bus electrodes  18   a  positioned over one end, one of the bus electrodes  20   a  positioned over its other end. Protrusion electrodes  18   b  overlap and protrude from corresponding bus electrode  18   a  into the areas of the discharge cells  8 R,  8 G,  8 B. Also, protrusion electrodes  20   b  overlap and protrude from the corresponding bus electrode  20   a  into the areas of discharge cells  8 R,  8 G,  8 B. Therefore, one protrusion electrode  18   b  and one protrusion electrode  20   b  are formed opposing one another in each area corresponding to each of the discharge cells  8 R,  8 G,  8 B. Discharge sustain electrodes  18  are scan electrodes, and discharge sustain electrodes  20  are display electrodes. 
     Proximal ends of protrusion electrodes  18   b ,  20   b  (i.e., where protrusion electrodes  18   b ,  20   b  are attached to and extend from bus electrodes  18   a ,  20   a , respectively) are formed corresponding to the shape of the ends of discharge cells  8 R,  8 G,  8 B. That is, the proximal ends of protrusion electrodes  18   b ,  20   b  reduce in width along direction Y as the distance from the center of discharge cells  8 R,  8 G,  8 B along direction X is increased to thereby correspond to the shape of the ends of discharge cells  8 R,  8 G,  8 B. 
     In the fourth embodiment, address electrodes  42  include enlarged regions  42   b  formed corresponding to the shape and location of protrusion electrodes  18   b  of scan electrodes  18 . Enlarged regions  42   b  increase an area of scan electrodes  13  that oppose address electrodes  42 . In more detail, address electrodes  42  include line regions  42   a  formed along direction X, and enlarged regions  42   b  formed at predetermined locations and expanding along direction Y corresponding to the shape of protrusion electrodes  18   b  as described above. 
     As shown in  FIG. 15 , when viewed from a front of the PDP, areas of enlarged regions  42   b  of address electrodes  42  opposing distal ends of protrusions  18   b  of scan electrodes  18  are substantially rectangular having width W 3 , and areas of enlarged regions  42   b  of address electrodes  42  opposing proximal ends of protrusions  18   b  of scan electrodes  18  are substantially in the shape of a trapezoid (with its base removed) having width W 4  that is less than width W 3  and decreases gradually as bus electrodes  18   a  are neared. With width W 5  corresponding to the width of line regions  42   a  of address electrodes  42 , the following inequalities are maintained: W 3 &gt;W 5  and W 4 &gt;W 5 . 
     With the formation of enlarged regions  42   b  at areas opposing scan electrodes  18  of address electrodes  42  as described above, address discharge is activated when an address voltage is applied between address electrodes  42  and scan electrodes  18 , and the influence of display electrodes  20  is not received. Accordingly, in the PDP of the fourth embodiment, address discharge is stabilized such that crosstalk is prevented during address discharge and sustain discharge, and an address voltage margin is increased. 
     External light absorbing members  48  are mounted between second substrate  4  and barrier ribs  6  at areas corresponding to non-discharge regions  10 . External light absorbing members  38  may be provided adjacent to dielectric layer  14  formed on second substrate  4  as in the first embodiment, or may be realized by the formation of tinted sections  28   a  at locations corresponding to non-discharge regions  10  to thereby increase the overall external light absorbing area of the PDP as in the second embodiment. 
       FIG. 16  is a partial plan view of a plasma display panel according to a fifth embodiment of the present invention. Like reference numerals will be used for elements identical to those of previous embodiments. 
     In the PDP according to the fifth embodiment, barrier ribs  6  define non-discharge regions  10  and discharge cells  8 R,  8 G,  8 B as in the first embodiment. Further, discharge sustain electrodes are formed along a direction (direction Y) substantially perpendicular to the direction address electrodes  42  are formed. The discharge sustain electrodes include scan electrodes (Ya, Yb) and display electrodes Xn (where n=1, 2, 3, . . . ). 
     Scan electrodes (Ya, Yb) and display electrodes Xn include bus electrodes  50   a ,  51   a , respectively, that extend along the direction substantially perpendicular to the direction address electrodes  42  are formed (direction Y), and protrusion electrodes  50   b ,  51   b , respectively, that are extended respectively from bus electrodes  50   a ,  51   a  such that a pair of protrusion electrodes  50   b ,  51   b  oppose one another in each discharge cell  8 R,  8 G,  8 B. Scan electrodes (Ya, Yb) act together with address electrodes  42  to select discharge cells  8 R,  8 G,  8 B and display electrodes Xn act to initialize discharge and generate sustain discharge between scan electrodes (Ya, Yb). 
     Letting the term “rows” be used to describe lines of discharge cells  8 R,  8 G,  8 B adjacent along direction Y, bus electrodes  51   a  of display electrodes Xn are provided such that one of the bus electrodes  51   a  is formed overlapping ends of discharge cells  8 R,  8 G,  8 B in every other pair of rows adjacent along direction X. Further, bus electrodes  50   a  of scan electrodes (Ya, Yb) are provided such that one bus electrode  50   a  of scan electrodes Ya and one bus electrode  50   a  of scan electrodes Yb are formed overlapping ends of discharge cells  8 R,  8 G,  8 B in every other pair of rows adjacent along direction X. Along this direction X, scan electrodes (Ya, Yb) and display electrodes Xn are provided in an overall pattern of Ya-X 1 -Yb-Ya-X 2 -Yb-Ya-X 3 -Yb- . . . -Ya-Xn-Yb. With this configuration, display electrodes Xn are able to participate in the discharge operation of all discharge cells  8 R,  8 G,  8 B. 
     Further, bus electrodes  50   a ,  51   a  respectively of scan electrodes (Ya, Yb) and display electrodes Xn are positioned also outside the region of discharge cells  8 R,  8 G,  8 B. This prevents a reduction in the aperture ratio by bus electrodes  50   a ,  51   a  such that a high degree of brightness is maintained. In addition, bus electrodes  51   a  of display electrodes Xn are formed covering a greater area along direction X than pairs of bus electrodes  50   a  of scan electrodes (Ya, Yb). This is because bus electrodes  51   a  of display electrodes Xn absorb outside light to thereby improve contrast. 
     External light absorbing members  58  are mounted between second substrate  4  and barrier ribs  6  at areas corresponding to non-discharge regions  10 . External light absorbing members  58  may be provided adjacent to dielectric layer  14  formed on second substrate  4  as in the first embodiment, or may be realized by the formation of tinted sections  28   a  at locations corresponding to non-discharge regions  10  to thereby increase the overall external light absorbing area of the PDP as in the second embodiment. 
       FIG. 17  is a partial exploded perspective view of a plasma display panel according to a sixth embodiment of the present invention, and  FIG. 18  is a sectional view of a front substrate of the plasma display panel of  FIG. 17 . Like reference numerals will be used for elements identical to those of previous embodiments. 
     In the sixth embodiment, the basic configuration of the first embodiment is used. That is, first substrate  2  and second substrate  4  are provided opposing one another with a predetermined gap therebetween, and barrier ribs  6  define non-discharge regions  10  and discharge cells  8 R,  8 G,  8 B. Further, external light absorbing members  68  are formed on an outer surface of first substrate  2  at areas corresponding to discharge regions  10 . External light absorbing members  68  prevent the reflection of external light. 
     Barrier ribs  6  define discharge cells  8 R,  8 G,  8 B in a direction of address electrodes  12  (direction X), and in a direction substantially perpendicular to the direction address electrodes  12  are formed (direction Y). Discharge cells  8 R,  8 G,  8 B are formed in a manner to optimize gas diffusion. In particular, each of the discharge cells  8 R,  8 G,  8 B is formed with ends that reduce in width along direction Y as a distance from a center of each of the discharge cells  8 R,  8 G,  8 B is increased in the direction address electrodes  12  are provided (direction X). Non-discharge regions  10  defined by barrier ribs  6  are formed in areas encompassed by discharge cell abscissas H and ordinates V that pass through centers of each of the discharge cells  8 R,  8 G,  8 B, and that are respectively aligned with direction Y and direction X. 
     Discharge sustain electrodes  18 ,  20  are formed in a striped pattern and respectively include bus electrodes  18   a ,  20   a  that extend along the direction address electrodes  42  are formed (direction Y), and protrusion electrodes  18   b ,  20   b  that are extended respectively from bus electrodes  18   a ,  20   a . For each row of discharge cells  8 R,  8 G,  8 B along direction Y, bus electrodes  18   a  are extended along one end of discharge cells  8 R,  8 G,  8 B and bus electrodes  20   a  are extended into an opposite end of discharge cells  8 R,  8 G,  8 B. Therefore, each of the discharge cells  8 R,  8 G,  8 B has one of the bus electrodes  18   a  positioned over one end, and one of the bus electrodes  20   a  positioned over its other end. Protrusion electrodes  18   b  overlap and protrude from corresponding bus electrode  18   a  into the areas of the discharge cells  8 R,  8 G,  8 B. Also, protrusion electrodes  20   b  overlap and protrude from the corresponding bus electrode  20   a  into the areas of discharge cells  8 R,  8 G,  8 B. Therefore, one protrusion electrode  18   b  and one protrusion electrode  20   b  are formed opposing one another in each area corresponding to each of the discharge cells  8 R,  8 G,  8 B. 
     Proximal ends of protrusion electrodes  18   b ,  20   b  (i.e., where protrusion electrodes  18   b ,  20   b  are attached to and extend from bus electrodes  18   a ,  20   a , respectively) are formed corresponding to the shape of the ends of discharge cells  8 R,  8 G,  8 B. That is, the proximal ends of protrusion electrodes  18   b ,  20   b  reduce in width along direction Y as the distance from the center of discharge cells  8 R,  8 G,  8 B along direction X is increased to thereby correspond to the shape of the ends of discharge cells  8 R,  8 G,  8 B. 
     As described above, external light absorbing members  68  are formed on an outer surface of first substrate  2  at areas corresponding to discharge regions  10 . As a result of being positioned over discharge regions, external light absorbing members  68  do not shield visible light used for display generated by the illumination of phosphor layers  16 R,  16 G,  16 B, and perform their function of absorbing part of the external light irradiated onto the PDP to thereby enhance the blocking of external light reflection. 
     External light absorbing members  68 , with reference to  FIG. 18 , may be realized by forming grooves  68   a  of a predetermined depth in the outer surface of first substrate  2  and at areas corresponding to non-discharge regions  10 , and by filling grooves  68   a  with a black light blocking material  68   b . The light blocking material  68   b  may be made of a material that is black such as the material used for light shielding films in conventional PDPs. 
     Grooves  68   a  may be formed in the outer surface of first substrate  2  using conventional sandblasting or etching techniques. Grooves  68   a  are formed to a depth of 100-300 μm, that is, a range that cause cracks to be formed in first substrate  2 . Further, external light absorbing members  68  are formed having a planar shape (in the X-Y plane) identical to that of non-discharge regions. However, the present invention is not limited to such a configuration and other shapes may be employed. 
     External light absorbing members  68  absorb external light irradiated onto the PDP (see the arrows in  FIG. 18 ) to thereby prevent external light from passing through to discharge cells  8 R,  8 G,  8 B. Therefore, external light absorbing members  68  minimize the reflection of external light from the outside of first substrate  2  to thereby improve bright room contrast, and effectively prevent shielding of parts of the screen by external light reflection. Further, external light absorbing members  68  are positioned to the outside of first substrate  2  and not on an inner surface of the same such that they do not affect discharge cells  8 R,  8 G,  8 B and thereby prevent abnormal discharge in discharge cells  8 R,  8 G,  8 B. 
     The sixth embodiment may provide these advantages while selectively applying the features of the third through fifth embodiments. 
       FIG. 19  is a partial exploded perspective view of a plasma display panel according to a seventh embodiment of the present invention, and  FIG. 20  is a sectional view of a front substrate of the plasma display panel of  FIG. 19 . Like reference numerals will be used for elements identical to those of previous embodiments. 
     In the seventh embodiment, the basic configuration of the first embodiment is used. That is, first substrate  2  and second substrate  4  are provided opposing one another with a predetermined gap therebetween, barrier ribs  6  define non-discharge regions  10  and discharge cells  8 R,  8 G,  8 B. Barrier ribs  6  define discharge cells  8 R,  8 G,  8 B in a direction of address electrodes  12  (direction X), and in a direction substantially perpendicular to the direction address electrodes  12  are formed (direction Y). Discharge cells  8 R,  8 G,  8 B are formed in a manner to optimize gas diffusion. In particular, each of the discharge cells  8 R,  8 G,  8 B is formed with ends that reduce in width along direction Y as a distance from a center of each of the discharge cells  8 R,  8 G,  8 B is increased in the direction address electrodes  12  are provided (direction X). Non-discharge regions  10  defined by barrier ribs  6  are formed in areas encompassed by discharge cell abscissas H and ordinates V that pass through centers of each of the discharge cells  8 R,  8 G,  8 B, and that are respectively aligned with direction Y and direction X. 
     Discharge sustain electrodes  18 ,  20  are formed in a striped pattern and respectively include bus electrodes  18   a ,  20   a  that extend perpendicular to the direction address electrodes  12  are formed, and protrusion electrodes  18   b ,  20   b  that are extended respectively from bus electrodes  18   a ,  20   a . For each row of discharge cells  8 R,  8 G,  8 B along direction Y, bus electrodes  18   a  are extended along one end of discharge cells  8 R,  8 G,  8 B and bus electrodes  20   a  are extended into an opposite end of discharge cells  8 R,  8 G,  8 B. Therefore, each of the discharge cells  8 R,  8 G,  8 B has one of the bus electrodes  18   a  positioned over one end, and one of the bus electrodes  20   a  positioned over its other end. Protrusion electrodes  18   b  overlap and protrude from corresponding bus electrode  18   a  into the areas of the discharge cells  8 R,  8 G,  8 B. Also, protrusion electrodes  20   b  overlap and protrude from the corresponding bus electrode  20   a  into the areas of discharge cells  8 R,  8 G,  8 B. Therefore, one protrusion electrode  18   b  and one protrusion electrode  20   b  are formed opposing one another in each area corresponding to each of the discharge cells  8 R,  8 G,  8 B. 
     Proximal ends of protrusion electrodes  18   b ,  20   b  (i.e., where protrusion electrodes  18   b ,  20   b  are attached to and extend from bus electrodes  18   a ,  20   a , respectively) are formed corresponding to the shape of the ends of discharge cells  8 R,  8 G,  8 B. That is, the proximal ends of protrusion electrodes  18   b ,  20   b  reduce in width along direction Y as the distance from the center of discharge cells  8 R,  8 G,  8 B along direction X is increased to thereby correspond to the shape of the ends of discharge cells  8 R,  8 G,  8 B. 
     Color compensating members  71  including pigmentation of the color having the lowest brightness ratio among the red, green, and blue phosphors forming phosphor layers  16 R,  16 G,  16 B are formed on an inner surface of first substrate  2  and at areas corresponding to the formation of non-discharge regions  10 . As shown clearly in  FIG. 10 , color compensating members  71  are films having substantially the same shape as non-discharge regions  10 . 
     In more detail, in the case where the brightness ratio of red is the lowest among red, green, and blue phosphors, color compensating members  71  are realized through films deposited with red paint to thereby compensate for this color. Other colors may be used if it is found that they have the lowest brightness ratio. 
     Accordingly, in the PDP of the seventh embodiment, color purity and color temperature are improved by color compensating members  71 . Also, white brightness is enhanced without the use of gamma compensation. In addition, since color compensating members  71  absorb part of the light passing through first substrate  2  from the outside, the dark/light ratio of the screen is improved. 
     In one embodiment, color compensating members  71  are formed occupying 50% or less of the total area of first substrate  2 . Further, color compensating members  71  have a color compensation ratio (i.e., color temperature increasing ratio) that is less than the combined transmissivity of first substrate  2 , protrusion electrodes  18   b ,  20   b , transparent dielectric layer  24 , and MgO protection layer  26 , but larger than a light transmissivity of conventional black stripes. 
     Eighth, ninth, and tenth embodiments of the present invention will now be described with reference to  FIGS. 21 ,  22 , and  23 , respectively. 
       FIG. 21  is a partial exploded perspective view of a plasma display panel according to an eighth embodiment of the present invention. Using the basic configurations of the above embodiments, color compensating members  73  are formed within non-discharge regions  10 , rather than on the inner surface of first substrate  2 . That is, color compensating members  73  are formed along inner surface of barrier ribs  6  defining non-discharge regions  10 , as well on exposed areas of dielectric layer  14  within non-discharge regions  10 . The color of color compensating members  73  is selected based on whichever of the red, green, and blue phosphors have the lowest brightness ratio. 
       FIG. 22  is a partial exploded perspective view of a plasma display panel according to a ninth embodiment of the present invention. Using the basic configurations of the above embodiments, both color compensating members  71  as described with reference to the seventh embodiment, and color compensating members  73  as described with reference to the eighth embodiment are provided in the PDP of this embodiment. In particular, color compensating members  71  are formed on the inner surface of first substrate  2 , and color compensating members  73  are formed within non-discharge regions  10 . 
       FIG. 23  is a sectional view of a front substrate of a plasma display panel according to a tenth embodiment of the present invention. In this embodiment, color compensating members  75  are formed to the outside surface of first substrate  2  (rather on the inner surface of the same) at areas corresponding to the positioning of non-discharge regions  10 . Color compensating members  75  may be realized by forming grooves  75   a  of a predetermined depth in the outer surface of first substrate  2  and at areas corresponding to discharge regions  10 , and by filling grooves  75   a  with a color layer  75   b.    
     Grooves  75   a  may be formed in the outer surface of first substrate  2  using conventional sandblasting or etching techniques. Grooves  75   a  are formed to a depth of 100-300 μm, that is, a range that cause cracks to be formed in first substrate  2 . 
     In the eighth and ninth embodiments, color compensating members  71  are shown having the same planar configuration (along the X-Y plane) as non-discharge regions  10 , but are not limited only to this configuration. Further, in the PDP of the seventh through tenth embodiments, features of the third through fifth embodiments may be applied while maintaining the particular features/advantages described. 
     Although embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that many variations and/or modifications of the basic inventive concepts herein taught which may appear to those skilled in the present art will still fall within the spirit and scope of the present invention, as defined in the appended claims.