Abstract:
A plasma display panel comprising plural kinds of phosphors, each of which emits a light having a respective, different kind of color, separators which separate the plural kinds of phosphors and discharge cells having sustain electrode pairs which create discharges producing the light emissions from the phosphors. In the plasma display pane, sustain discharge currents through the sustain electrode pairs in the discharge cells are set respective, different values according to respective brightnesses of the lights emitted from the plural kinds of phosphors.

Description:
[0001]    This application is a divisional application of U.S. Ser. No. 09/488,018, now allowed. 
     
    
     
       BACKGROUND OF THE INVENTION  
         [0002]    1. Field of the Invention  
           [0003]    The present invention generally relates to a plasma display panel (PDP), and more particularly to a color plasma display panel in which a white color temperature is increased based on improvements of sustain electrodes.  
           [0004]    2. Description of the Related Art  
           [0005]    Recently, in the field of display apparatuses, a complexity of information to be displayed, a size of a display panel and a definition of a display panel are increasing rapidly. Therefore, an improvement of a display quality of a PDP is required. The PDP is being developed at a rapid pace because the PDP has advantageous characteristics, for example, no-flicker, ease of achieving a large panel, a high brightness and a long lifetime. There are two types of AC-PDPs. One type has two electrodes which create a selection discharge (an address-discharge) and a sustain discharge between the two electrodes. The other type has three electrodes, the third electrode of which creates address-discharges. In a gray-scale color PDP, the phosphors placed in discharge-cells are excited by an ultraviolet light generated by discharges. The phosphors are degraded by ionic bombardments simultaneously generated by the discharges. In the PDP having two electrodes, the phosphors are directly bombard by the ions. This may results in a short lifetime of the phosphors. To avoid the short lifetime of the phosphors, three electrodes generating a surface discharge are generally used in the color PDP. There are types of PDPs having the three electrodes. One type has the third electrode on the same substrate as that on which the first and the second electrodes are provided and the other type has the third electrode on a separate substrate which is opposite to the substrate having the first and the second electrodes. There are two types of PDPs having the three electrodes provided on the same substrate. One type has the third electrode deposited on the first and the second electrodes and the other type has the third electrode deposited under the first and the second electrodes. Furthermore, in a transmission type PDP, a light emitted from the phosphor can be seen through the phosphor, and in a reflection type PDP, a light reflected from the phosphor can be seen. Discharge cells are separated from adjacent discharge cells by separators. Each discharge cell may be sealed by surrounding separators. Otherwise, separators may be provided in only one direction of each discharge cell and each cell is isolated in another direction by an action of an electric field generated by proper gaps between the electrodes.  
           [0006]    [0006]FIG. 1 shows a plan view of a PDP of one example according to the prior art. Two sustain electrodes, such as an X-electrode  101  (the first electrode) and Y-electrodes  102  to  106  (the second electrodes) are deposited on a substrate. Address electrodes  107  to  116  (the third electrodes) are provided on another substrate. Then, these two substrates are sealed together. Separators  117  to  127  are created perpendicular to a surface of the substrates. Separators  117  to  127  are also perpendicular to the X-electrode  101  and the Y-electrodes  102  to  106  and parallel to the address electrodes  107  to  116 . Each of the X-electrode  101  and the Y-electrodes  102  to  106  has a transparent electrode in part. This PDP is the reflection-type PDP. Therefore, a light reflected from the phosphor can be seen.  
           [0007]    [0007]FIG. 2 shows a cross section in a direction parallel to the address electrodes  107  to  116  of the PDP shown in FIG. 1. The PDP comprises a front glass substrate  201  and a rear glass substrate  202 . Sustain electrodes which comprise the X-electrode and the Y-electrodes are deposited on the front glass substrate  201 . The X-electrode has a transparent electrode  203  and a bus electrode  204 . The Y-electrode has a transparent electrode  205  and a bus electrode  206 . The transparent electrodes  203  and  205  are made up of an ITO which is a transparent conductive film of mainly indium oxide because they must transmit a light reflected from a phosphor. A resistance of the bus electrodes  204 ,  206  and  208  is needed to be low to prevent a voltage drop caused by the electrode resistance. Therefore, the bus electrodes  204 ,  206  and  208  are made up of chrome or copper. The X-electrode and the Y-electrodes are covered with a dielectric layer  209 . Furthermore, a magnesium oxide protection layer  210  is provided on the dielectric layer  209 . A surface of the protection layer  210  is a discharge surface. The address electrode  211  is deposited on the rear glass substrate  202  perpendicular to the X-electrode and the Y-electrodes which are deposited on the front glass substrate  201 .  
           [0008]    [0008]FIG. 3 shows a cross section in a direction parallel to the X-electrodes  101  of the PDP shown in FIG. 1. Separators  310 ,  311 ,  312  and  313  are deposited between address electrodes  307 ,  308  and  309 . A red phosphor  314 , a green phosphor  315  and a blue phosphor  316  are deposited on the address electrodes between the separators. The front glass substrate  301  and the rear glass substrate  302  are assembled so that tips of the separators  310  to  313  are sealed to a magnesium oxide layer  306 .  
           [0009]    [0009]FIG. 4 show a plan view of sustain electrodes for red, green and blue phosphors. A sustain electrode pair comprises an X-electrode  1  and a Y-electrode  1 . The X-electrode  1  comprises a bus electrode  401  and a transparent electrode  402 . The Y-electrode  1  comprises a bus electrode  403  and a transparent electrode  404 . A sustain discharge is created at a slit  413  between the X-electrode  1  and the Y-electrode  1 . This slit  413  is referred to as a positive slit  1 . A slit  415  is also referred to as a positive slit  2 . A sustain discharge is not created at a slit  414  between the X-electrode  2  and the Y-electrode  1 . This slit  414  is referred to as an opposite slit  2 . A red phosphor is deposited between separators  409  and  410  and a red light is emitted from the positive slit  1  between separators  409  and  410  when a sustain discharge is created at the positive slit  1 . A green phosphor is deposited between separators  410  and  411 , and a blue phosphor is deposited between separators  411  and  412 . A green light and a blue light are also emitted from the positive slit  1  when a sustain discharge is created at the positive slit  1 . Address electrodes not shown in FIG. 4 are provided parallel to the separators. FIG. 5 shows a relationship among a sustain electrode size, a discharge current value and a brightness. FIG. 5 (A) shows a relationship between the sustain electrode size and the discharge current value. A solid line  501  shows a case where each sustain electrode provided for the red, green and blue phosphor cells has the same width. In this case, each discharge current at the red, green and blue phosphor cells has the same value despite the sustain electrode size. As a result, each ultraviolet ray generated by a discharge to excite the red, green and blue phosphor cells has the same strength.  
           [0010]    However, each luminous efficiency and maximum brightness of the red, green and blue phosphors are different from each other. Therefore, a brightness of a particular color is lower than those of other colors even if each phosphor is excited by the ultra violet ray having the same strength generated by the discharge having the same strength. As a result, a white color temperature is reduced and this results in a degradation of a display quality.  
           [0011]    For example, FIG. 5 (B) shows a relationship between the sustain electrode size and the brightness. As described above, in case that each sustain electrode provided for the red, green and blue phosphor cells has the same width, the red, green and blue phosphor cells are excited by ultraviolet rays having the same strength. A blue brightness  51   1 , a red brightness  512  and a green brightness  513  are different from each other. The blue brightness  511  is the lowest of the three. As a result, the white color temperature is low.  
         SUMMARY OF THE INVENTION  
         [0012]    It is a general object of the present invention to provide a plasma display panel in which the above disadvantages are eliminated. A more specific object of the present invention is to provide a plasma display panel in which a white color temperature is increased.  
           [0013]    The above objects of the present invention are achieved by a plasma display panel comprising plural kinds of phosphors, each of which emits a light having a different kind of color, separators which separate the plural kinds of phosphors and discharge cells having sustain electrode pairs which create discharges to create the light emissions from the phosphors. In the plasma display panel, a sustain discharge current through each sustain electrode pair in the discharge cells is set a different value according to a brightness of each light emitted from the plural kinds of phosphors.  
           [0014]    According to the invention, a white color temperature is increased because the brightness of a particular discharge cell which is defined by the separators surrounding a discharge space in which the phosphor having a low brightness is deposited is increased. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0015]    Other objects, features and advantages of the present invention will become more apparent from the following detailed description when read in conjunction with the accompanying drawings, in which:  
         [0016]    [0016]FIG. 1 shows a plan view of a PDP of one example according to the prior art;  
         [0017]    [0017]FIG. 2 shows a cross section in a direction parallel to address electrodes of the PDP shown in FIG. 1;  
         [0018]    [0018]FIG. 3 shows a cross section in a direction parallel to X-electrodes of the PDP shown in FIG. 1;  
         [0019]    [0019]FIG. 4 show a plan view of sustain electrodes for red, green and blue phosphors;  
         [0020]    [0020]FIG. 5A shows a relationship between a sustain electrode size and a discharge current value and FIG. 5B, between sustain electrode area and brightness;  
         [0021]    [0021]FIG. 6A shows a principle of the present invention;  
         [0022]    [0022]FIG. 6B is a cross section of the PDP shown in FIG. 1;  
         [0023]    [0023]FIG. 6C shows a chromaticity diagram;  
         [0024]    [0024]FIG. 7 shows a plan view of a PDP of a first embodiment according to the present invention;  
         [0025]    [0025]FIG. 8A shows a plan view of a PDP and discharge currents of a second embodiment according to the present invention and FIG. 8B shows related discharge current waveforms;  
         [0026]    [0026]FIG. 9 shows a plan view of a PDP of a third embodiment according to the present invention;  
         [0027]    [0027]FIG. 10 shows a plan view of a PDP of a fourth embodiment according to the present invention;  
         [0028]    [0028]FIG. 11 shows a plan view of a PDP of a fifth embodiment according to the present invention;  
         [0029]    [0029]FIG. 12 shows a plan view of a PDP of a sixth embodiment according to the present invention;  
         [0030]    [0030]FIG. 13 shows a plan view of a PDP of a seventh embodiment according to the present invention;  
         [0031]    [0031]FIG. 14 shows a plan view of a PDP of an eighth embodiment according to the present invention;  
         [0032]    [0032]FIG. 15 shows a plan view of a PDP of a ninth embodiment according to the present invention;  
         [0033]    [0033]FIG. 16 shows a plan view of a PDP of a tenth embodiment according to the present invention;  
         [0034]    [0034]FIG. 17 shows a plan view of a PDP of an eleventh embodiment according to the present invention;  
         [0035]    [0035]FIG. 18 shows a plan view of a PDP of a twelfth embodiment according to the present invention;  
         [0036]    [0036]FIG. 19 shows a plan view of a PDP of a thirteenth embodiment according to the present invention; and  
         [0037]    [0037]FIG. 20 shows a display monitor in which a PDP according to the present invention is provided. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0038]    First a principle of the present invention will be explained. FIG. 6 shows the principle of the present invention and particularly a cross section of the PDP shown in FIG. 1. FIG. 6B shows discharge currents for sustain electrodes. FIG. 6C is a chromaticity diagram. FIG. 6A shows the cross section in a direction parallel to the X-electrodes  101  of the PDP shown in FIG. 1. Separators, or barriers,  610 ,  611 ,  612  and  613  are deposited between address electrodes  607 ,  608  and  609 . A red phosphor  614 , a green phosphor  615  and a blue phosphor  616  are deposited on respective address electrodes between the separators. The front glass substrate  601  and the rear glass substrate  602  are assembled so that tips of the separators  610  to  613  are sealed to a magnesium oxide layer  606 . In FIG. 6A, arrows in discharge spaces show discharge currents and the thicker arrow shows the larger discharge current. Conventionally, each discharge current at the electrodes for a red phosphor, a green phosphor and a blue phosphor had the same value. According to the present invention, the discharge current at the electrodes for the green phosphor is the same value as used in the conventional PDP, the discharge current at the electrodes for the red phosphor is smaller than that at the electrodes for the green phosphor and the discharge current at the electrodes for the blue phosphor is larger than that at the electrodes for the green phosphor, as shown in FIG. 6B. As a result, a white color temperature is increased from 6200 K to 9000 K as shown in FIG. 6C. That is to say, the white color temperature is increased by modifying each discharge current at the red, green and blue phosphors.  
         [0039]    Next, a first embodiment of the present invention will be explained. FIG. 7 shows a plan view of a PDP of the first embodiment according to the present invention. Transparent electrodes  702 ,  704 ,  706  and  708  in a blue phosphor cell (hereinafter referred to as blue electrodes) are extended to twice the size of the transparent electrodes in red and green phosphor cells (hereinafter referred to as red electrodes and green electrodes) in a direction of an opposite slit  714  which slit creates no discharge, while a distance between the transparent electrodes  702 ,  704  and  706 ,  708  at positive slits  713  and  715  which slits create discharges is unchanged. Therefore, a blue electrode discharge current is increased as shown by a solid line  503  in FIG. 5 (A). Therefore, a blue brightness is increased as shown by a solid line  515  in FIG. 5 (B). As a result, a white color temperature is increased because the blue brightness is increased relatively higher than the red brightness and the green brightness. The blue electrodes may be expanded to an arbitrary size other than twice the size of the red electrodes and the green electrodes.  
         [0040]    Next, a second embodiment of the present invention will be explained. FIG. 8A shows a plan view of a PDP, and FIG. 8B shows discharge currents, of the second embodiment according to the present invention. In this embodiment, a discharge is created at positive slits  813  and  815 . Blue electrodes and green electrodes of transparent electrodes  802 ,  804 ,  806  and  808  are expanded in a direction of an opposite slit  814 , while a distance between the transparent electrodes  802 ,  804  and  806 ,  808  at the positive slits  813  and  815  is unchanged. Particularly, the blue electrodes are extended so as to be larger than the green electrodes. On the other hand, when a length of an opposite slit  814  becomes too short, the opposite slit  814  affects the discharge created at the adjacent positive slits  813  and  815 . Therefore, each extension area size of the blue electrodes and the green electrodes is limited within a range in which the discharge at the positive slits  813  and  815  is created stably. FIG. 8B shows discharge current waveforms of the red electrode, the green electrode and the blue electrode. Conventionally, each discharge current at the red electrodes, the green electrodes and the blue electrodes had the same value. As the extension area size of each electrode is modified according to the present invention, as mentioned above, the discharge current at the green electrodes is the same value as used in the conventional PDP, the discharge current at the red electrodes is smaller than that at the green electrodes and the discharge current at the blue electrodes is larger than that at the green electrodes, as shown in FIG. 8B. As a result, a white color temperature is increased because the brightness of each color can be adjusted relatively as mentioned above.  
         [0041]    Next, a third embodiment of the present invention will be explained. FIG. 9 shows a plan view of a PDP of the third embodiment according to the present invention. Blue electrodes and green electrodes of transparent electrodes  902 ,  904 ,  906  and  908  are extended in a direction of positive slits  913  and  915 , while a distance between the transparent electrodes  902 ,  904  and  906 ,  908  at the opposite slit  914  is unchanged. Particularly, the blue electrodes are extended so as to be larger than the green electrodes. On the other hand, when respective, individual lengths of the positive slits  913  and  915  between the red electrodes, the green electrodes and the blue electrodes differ from each other, the respective, individual discharge starting voltages at the red electrodes, the green electrodes and the blue electrodes have different values. Therefore, the respective individual extension area sizes of the three kinds of electrodes are each limited within a range in which all the discharges at the positive slits  913  and  915  are created stably. As a result, a white color temperature is increased because the brightness of each color cell can be adjusted relatively by modifying each size of the transparent electrodes  902 ,  904 ,  906  and  908  in each color cell as mentioned above.  
         [0042]    Next, a fourth embodiment of the present invention will be explained. FIG. 10 shows a plan view of a PDP of the fourth embodiment according to the present invention. In this embodiment, a discharge is alternatively created at adjacent slits  1013 ,  1014  and  1015 . That is, discharges are simultaneously created in both the slit  1013  between the transparent electrodes  1002  and  1004  and the slit  1015  between the transparent electrodes  1006  and  1008 , then, a discharge is created in the slit  1014  between the transparent electrodes  1004  and  1006  at a next time. In this embodiment, transparent electrodes  1002 ,  1004 ,  1006  and  1008  are extended in a direction of both slits in which discharges are alternatively created, as mentioned above, at each phosphor cell. Particularly, blue electrodes are extended so as to be larger than green electrodes. When respective, individual lengths of the slits  1013 ,  1014  and  1015  between the red electrodes, the green electrodes and the blue electrodes differ from each other, each of the discharge starting voltages at the red electrodes, the green electrodes and the blue electrodes has a different value. Therefore, the respective extension area sizes of the three kinds of electrodes the respective extension area sizes of the blue electrodes and the green electrodes are each limited within a range in which the discharge at the positive slits  1113  and  1115  is created stably. As a result, when the PDP has T-shaped parts in the positive slits  1113  and  1115  which create discharges, a white color temperature is increased because the brightness of each color cell can be adjusted relatively by modifying each size of the transparent electrodes  1102 ,  1104 ,  1106  and  1108  in each color cell as mentioned above.  
         [0043]    Next, a sixth embodiment of the present invention will be explained. FIG. 12 shows a plan view of a PDP of the sixth embodiment according to the present invention. In this embodiment, transparent electrodes  1202 ,  1204 ,  1206  and  1208  have T-shaped parts in positive slits  1213  and  1215  of red, green and blue cells, which create discharges. Each T-shaped part comprises a narrow part and a wide part as shown in FIG. 12. Blue electrodes and green electrodes of transparent electrodes  1202 ,  1204 ,  1206  and  1208  are extended in a direction of positive slits  1213  and  1215  without changing a shape of T-shaped parts, while a distance between the transparent electrodes  1202 ,  1204 ,  1206  and  1208  at the negative slit  1214  is unchanged. Particularly, the blue electrodes are extended so as to be larger than the green electrodes. When the respective lengths of the positive slits  1213  and  1215  between the red electrodes, the green electrodes and the blue electrodes differ from each other, each of the respective discharge starting voltages at the positive slits  1213  and  1215  of the red electrodes, the green electrodes and the blue electrodes has a different value. Therefore, each of the respective extension area sizes of the three kinds of electrodes is limited within a range in which all the discharges at the slit  1213  and  1215  are created stably. As a result, when the PDP has T-shaped parts in the positive slits  1213  and  1215  which create discharges, a white color temperature is increased because the brightness of each color cell can be adjusted relatively by modifying each size of the transparent electrodes  1202 ,  1204 ,  1206  and  1208  in each color cell as mentioned above.  
         [0044]    In this embodiment, the respective discharge starting voltages of the red electrodes, the green electrodes and the blue electrodes differ from each other, because each distance between T-shaped parts of the red electrodes, the green electrodes and the blue electrodes is modified. However, it is possible to have the same distance between T-shaped parts of the three kinds of electrodes so that each discharge starting voltage of the three kinds of electrodes may have the same value.  
         [0045]    Next, a seventh embodiment of the present invention will be explained. FIG. 13 shows a plan view of a PDP of the seventh embodiment according to the present invention. In this embodiment, transparent electrodes  1302 ,  1304 ,  1306  and  1308  have T-shaped parts in positive slits  1313  and  1315  of red, green and blue cells, which create discharges. Each T-shaped part comprises a narrow part and a wide part as shown in FIG. 13. The narrow parts of the T-shaped parts of the blue electrodes and green electrodes of the transparent electrodes  1302 ,  1304 ,  1306  and  1308  are expanded in a direction of positive slits  1313  and  1315 , while a distance between the transparent electrodes  1302 ,  1304 ,  1306  and  1308  at the negative slit  1314  is unchanged. Particularly, the narrow parts of the T-shaped parts of the blue electrodes are expanded so as to be longer than that of the green electrodes. When the respective lengths of the positive slits  1313  and  1315  between the red electrodes, the green electrodes and the blue electrodes differ from each other, the respective discharge starting voltages at the positive slits  1313  and  1315  of the red electrodes, the green electrodes and the blue electrodes also have different values. Therefore, each length of the T-shaped parts of the three kinds of electrodes is limited within a range in which all the discharges at the slit  1313  and  1315  are created stably. As a result, when the PDP has T-shaped parts in the positive slits  1313  and  1315  which create discharges, a white color temperature is increased because the brightness of each color cell can be adjusted relatively by modifying each size of the transparent electrodes  1302 ,  1304 ,  1306  and  1308  in each color cell as mentioned above.  
         [0046]    Next, an eighth embodiment of the present invention will be explained. FIG. 14 shows a plan view of a PDP of the eighth embodiment according to the present invention. In this embodiment, transparent electrodes  1402 ,  1404 ,  1406  and  1408  have T-shaped parts in positive slits  1413  and  1415  of red, green and blue cells, which create discharges. Each T-shaped part comprises a narrow part and a wide part as shown in FIG. 14. A length of the wide parts of blue electrodes and a length of the wide parts of green electrodes of the transparent electrodes  1402 ,  1404 ,  1406  and  1408  are expanded, while a distance between the T-shaped parts of the transparent electrodes  1402 ,  1404 ,  1406  and  1408  at the positive slits  1413  and  1415 , and a distance between the transparent electrodes  1402 ,  1404 ,  1406  and  1408  at the negative slit  1414  are unchanged. Particularly, the blue electrodes are expanded so as to be larger than the green electrodes. As a result, when the PDP has T-shaped parts in the positive slits  1413  and  1415  which create discharges, a white color temperature is increased because the brightness of each color cell can be adjusted relatively by modifying each size of the transparent electrodes  1402 ,  1404 ,  1406  and  1408  in each color cell as mentioned above.  
         [0047]    Next, a ninth embodiment of the present invention will be explained. FIG. 15 shows a plan view of a PDP of the ninth embodiment according to the present invention. In this embodiment, transparent electrodes  1502 ,  1504 ,  1506  and  1508  have T-shaped parts in all slits  1413 ,  1414  and  1415  of red, green and blue cells, which alternately create discharges. Each T-shaped part comprises a narrow part and a wide part as shown in FIG. 15. In this embodiment, a discharge is alternatively created at adjacent slits  1513 ,  1514  and  1515 . That is to say, discharges are simultaneously created in both the slit  1513  between the T-shaped part of the transparent electrode  1502  and the T-shaped part of the transparent electrode  1504  and the slit  1515  between the T-shaped part of the transparent electrode  1506  and the T-shaped part of the transparent electrode  1508 . Then, a discharge is created in the slit  1514  between the T-shaped part of the transparent electrode  1504  and the T-shaped part of the transparent electrode  1506  at a next time. In this embodiment, the narrow parts of blue electrodes and green electrodes of the transparent electrodes  1502 ,  1504 ,  1506  and  1508  are extended in a direction of both slits in which discharges are alternatively created as mentioned above, at each phosphor cell. Particularly, the blue electrodes are extended so as to be larger than the green electrodes. When the respective lengths of the slits  1513 ,  1514  and  1515  between the red electrodes, the green electrodes and the blue electrodes differ from each other, the respective discharge starting voltages at the red electrodes, the green electrodes and the blue electrodes each has a different value. Therefore, the respective extension area sizes of the red electrodes, the green electrodes and the blue electrodes are each limited within a range in which all the discharges at the slits  1513 ,  1514  and  1515  are created stably. As a result, when the PDP has T-shaped parts in the slits  1513 ,  1514  and  1515  which alternatively create discharges, a white color temperature is increased because the brightness of each color cell can be adjusted relatively by modifying each size of the transparent electrodes  1502 ,  1504 ,  1506  and  1508  in each color cell as mentioned above.  
         [0048]    Next, a tenth embodiment of the present invention will be explained. FIG. 16 shows a plan view of a PDP of the tenth embodiment according to the present invention. In this embodiment, each of transparent electrodes  1602 ,  1604 ,  1606  and  1608  has rectangular projections as shown in FIG. 16 in each of positive slits  1613  and  1615  of red, green and blue cells, which create discharges. Blue electrodes and green electrodes of the transparent electrodes  1602 ,  1604 ,  1606  and  1608  are extended in a direction of a negative slit  1614 , while a distance between the rectangular projection of the transparent electrodes  1602 ,  1604 ,  1606  and  1608  at the positive slits  1613  and  1615  is unchanged. Particularly, the blue electrodes are extended so as to be larger than the green electrodes. In this case, when a length of an opposite slit  1614  becomes too short, the opposite slit  1614  affects the discharge created at the positive slits  1613  and  1615 . Therefore, the respective extension area sizes of the blue electrodes and the green electrodes are each limited within a range in which the discharge at the positive slits  1613  and  1615  is created stably. As a result, when the PDP has the rectangular projections in the positive slits  1613  and  1615  which create discharges, a white color temperature is increased because the brightness of each color cell can be adjusted relatively by modifying the respective sizes of the transparent electrodes  1602 ,  1604 ,  1606  and  1608  in each color cell as mentioned above.  
         [0049]    Next, an eleventh embodiment of the present invention will be explained. FIG. 17 shows a plan view of a PDP of the eleventh embodiment according to the present invention. In this embodiment, each of transparent electrodes  1702 ,  1704 ,  1706  and  1708  has rectangular projections as shown in FIG. 17 in each of positive slits  1713  and  1715  of red, green and blue cells, which create discharges. Blue electrodes and green electrodes of the transparent electrodes  1702 ,  1704 ,  1706  and  1708  are extended in a direction of the positive slits  1713  and  1715  without changing a distance between the rectangular projections. Particularly, the blue electrodes are extended so as to be larger than the green electrodes. As a result, when the PDP has the rectangular projections in the positive slits  1513  and  1515  which create discharges, a white color temperature is increased because the brightness of each color cell can be adjusted relatively by modifying each size of the transparent electrodes  1702 , 1704 ,  1706  and  1708  in each color cell as mentioned above.  
         [0050]    Next, a twelfth embodiment of the present invention will be explained. FIG. 18 shows a plan view of a PDP of the twelfth embodiment according to the present invention. In this embodiment, transparent electrodes  1802 ,  1804 ,  1806  and  1808  have T-shaped parts in all slits  1813 ,  1814  and  1815  of red, green and blue cells, which alternately create discharges. Each T-shaped part comprises a narrow part and a wide part as shown in FIG. 18. In this embodiment, discharges are alternately created at adjacent slits  1813 ,  1814  and  1815 . That is to say, discharges are simultaneously created in both the slit  1813  between the T-shaped part of the transparent electrodes  1802  and the T-shaped part of the transparent electrodes  1804  and the slit  1815  between the T-shaped part of the transparent electrode  1806  and the T-shaped part of the transparent electrode  1808 , then, a discharge is created in the slit  1814  between the T-shaped part of the transparent electrode  1804  and the T-shaped part of the transparent electrode  1806  at a next time. In this embodiment, the T-shaped parts of blue electrodes and green electrodes of the transparent electrodes  1802 ,  1804 ,  1806  and  1808  are extended in a direction parallel to bus electrodes  1801 ,  1803 ,  1805  and  1807 , while a length of the slits  1813 ,  1814  and  1815  is unchanged. Particularly, the blue electrodes are extended so as to be larger than the green electrodes. As a result, when the PDP has T-shaped parts in the slits  1813 ,  1814  and  1815  which alternately create discharges, a white color temperature is increased because the brightness of each color cell can be adjusted relatively by modifying each size of the transparent electrodes  1802 ,  1804 ,  1806  and  1808  in each color cell as mentioned above.  
         [0051]    Next, a thirteenth embodiment of the present invention will be explained. FIG. 19 shows a plan view of a PDP of the thirteenth embodiment according to the present invention. In this embodiment, each of transparent electrodes  1902 ,  1904 ,  1906  and  1908  has projections as shown in FIG. 19 in all slits  1913 ,  1914  and  1915  of red, green and blue cells, which alternately create discharges. In this embodiment, discharges are alternately created at adjacent slits  1913 ,  1914  and  1915 . That is to say, discharges are simultaneously created in both the slit  1913  between the projections of the transparent electrode  1902  and the projections of the transparent electrode  1904  and the slit  1815  between the projections of the transparent electrode  1906  and the projections of the transparent electrode  1908 . Then, a discharge is created in the slit  1914  between the projections of the transparent electrode  1904  and the projections of the transparent electrode  1906  at a next time. In this embodiment, the blue electrodes and green electrodes of the transparent electrodes  1902 ,  1904 ,  1906  and  1908  are extended in a direction of the slits  1913 ,  1914  and  1915 , while a length of the slits  1813 ,  1814  and  1815  between the projections is unchanged. Particularly, the blue electrodes are extended so as to be larger than the green electrodes. As a result, in a case that the PDP has the projections in the slits  1913 ,  1914  and  1915  which alternately create discharges, a white color temperature is increased because the brightness of each color cell can be adjusted relatively by modifying each size of the transparent electrodes  1902 ,  1904 ,  1906  and  1908  in each color cell as mentioned above.  
         [0052]    Next, a fourteenth embodiment of the present invention will be explained.  
         [0053]    [0053]FIG. 20 shows a display monitor in which a PDP according to the present invention is provided. A display monitor  2001  has a PDP  2002  according to the present invention. The PDP  2002  according to the present invention can also be applied to a television receiver.  
         [0054]    In the disclosed embodiments mentioned above, blue and green electrodes are relatively extended to increase brightness of both blue and green phosphors. However, it is possible to arbitrarily modify areas of red, green and blue electrodes so that a particular white color temperature may be created. In the disclosed embodiments mentioned above, color ACPDPs were explained. However, the present invention is not limited to the specifically disclosed embodiments and is applicable to all kinds of PDPs for color displays. Furthermore, the PDPs having the electrodes according to the present invention can be easily manufactured using a conventional manufacturing process if only mask patterns for the electrodes are modified.  
         [0055]    The present invention is not limited to the specifically disclosed embodiments, and variations and modifications may be made without departing from the scope of the present invention.  
         [0056]    The present application is based on Japanese priority application No. 11-074478 filed on Mar. 18, 1999, the entire contents of which are hereby incorporated by reference.