CN1648974A - 等离子显示板驱动方法 - Google Patents
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Abstract
本发明公开了一种等离子显示板的驱动方法,该等离子显示板包括多个第一电极和多个第二电极以及多个沿着垂直于所述第一和第二电极的方向延伸的第三电极。所述第二电极在重置周期、寻址周期和维持周期内被施加偏压。第一电极的电压从第二电压增大到第三电压。在重置周期内,第一电极的电压从第四电压减小到第五电压。该第五电压比在维持周期内施加用来维持放电的电压中的最小值小。
Description
技术领域
本发明涉及一种等离子显示板(PDP)的驱动方法。
背景技术
PDP是一种使用气体放电产生的等离子体显示图像或字符的平板显示器,根据其尺寸,PDP包括超过百万计的以矩阵形式布置的像素。根据驱动电压波形及放电单元的结构,可以将PDP归类为直流型(DC)和交流型(AC)。
DC PDP的电极直接暴露在放电空间内,因此,在施加电压中电流直接在放电空间中流动。相比之下,在AC PDP中,电极被介电层覆盖。所以,自然地形成了限流的电容,并且在放电期间可以保护电极不受离子脉冲的影响。因此,AC PDP相比DC PDP具有更长的寿命。
这种AC PDP包括多个形成在一个衬底上并且平行布置的扫描电极和维持电极。多个寻址电极布置在相对衬底上,并且沿着与扫描电极和维持电极正交的方向延伸。该维持电极对应于每个扫描电极布置。维持电极的一端公共相连。
图1是AC PDP的局部透视图。该PDP包括两个彼此相对布置的玻璃衬底1和6。被介电层2和保护层3覆盖的成对扫描电极4和维持电极5平行布置在第一衬底1上。被绝缘层7覆盖的多个寻址电极8布置在第二衬底6上。分隔肋9平行于寻址电极8形成在绝缘层7上。荧光材料13形成在分隔肋9之间的绝缘层7的表面以及每个分隔肋9的两侧上。玻璃衬底1和6彼此相对地布置,并且在它们之间形成放电空间11,这样,寻址电极8与扫描电极4和维持电极5正交。在每个寻址电极8与每对扫描电极4和维持电极5的相交处的放电空间形成放电单元12。
图2示出AC PDP的驱动波形。通常,在PDP中,一帧被分成多个次场(sub field),并被驱动。每个次场包括重置周期、寻址周期、维持周期和擦除周期。重置周期是擦除通过前一个维持放电形成的壁电荷并且设定新的壁电荷以便稳定地执行下一次寻址放电的周期。寻址周期是用于选择通电和断电单元并且在通电单元(被寻址单元)上积累壁电荷的周期。维持周期是执行维持放电以便在被寻址的单元上显示视频图像的周期。擦除周期是擦除放电单元的壁电荷并且终止维持放电的周期。
为了实现上述操作,如图2所示,在维持周期内在扫描电极和维持电极上交替供应维持放电脉冲,在跟随该维持周期之后的擦除周期内,逐渐上升的斜坡电压供应给维持电极X。然后,在寻址电极A被保持在接地电压(0V)并且维持电极X被以预定电压偏置的情况下,将重置波形供应给扫描电极Y。然后,在寻址周期内,将寻址波形供应给扫描电极Y和寻址电极A,以便当扫描电极Y和维持电极X被分别保持在预定电压时选择需要显示的放电单元。
但是,对于PDP的传统驱动方法,分别需要驱动扫描电极Y的扫描驱动板、驱动维持电极X的维持驱动板和驱动寻址电极A的寻址驱动板。所以,需要在机架内构造三个驱动板,因此增加了成本。
发明内容
根据本发明,提供一种PDP的驱动方法,其能够在不使用维持驱动板的条件下防止误放电。在一个示例性实施例中,维持电极接地,将驱动波形供应给扫描电极。
本发明的一个方面是PDP的驱动方法,其中所述PDP包括多个第一电极、多个第二电极和多个在垂直于第一和第二电极的方向上延伸的第三电极。次场具有重置周期、寻址周期和维持周期。该驱动方法包括:在重置周期、寻址周期和维持周期内以第一电压偏置第二电极;将第一电极的电压从第二电压升高到第三电压;以及,在重置周期内将第一电极的电压从第四电压降低到第五电压。其中,第五电压低于在维持周期内用于维持放电的电压中的最低电压。此外,第一电压是接地电压,第五电压和第一电压之间的电压差是放电启动电压。
本发明的另一方面在于提供一种PDP的驱动方法,该驱动方法包括:在重置周期、寻址周期和维持周期内以第一电压偏置第二电极;将第一电极的电压从第二电压升高到第三电压,并且为第三电极供应第四电压;以及,在重置周期内将第一电极的电压从第五电压降低到第六电压,并且将第七电压供应给第三电极。
其中,第四电压是供应给形成在寻址周期中需要选定的放电单元的第三电极的电压。第七电压是供应给形成在寻址周期中需要不选定的放电单元的第三电极的电压。
附图说明
图1是AC PDP的局部透视图;
图2示出AC PDP的驱动波形;
图3示出根据本发明一个示例性实施例的PDP的透视图;
图4是根据本发明一个示例性实施例的PDP的简化示图;
图5示出根据本发明一个示例性实施例的机架的简化平视图;
图6示出根据本发明第一示例性实施例的PDP的驱动波形;
图7示出电压差和壁电荷的对应关系,其中,电压差是在图6的驱动波形中供应给扫描电极的电压和供应给维持电极的电压之间的差;
图8A-8D示出根据图6的驱动波形的分配后的壁电荷;
图9示出根据本发明第二示例性实施例的PDP的驱动波形;
图10示出电压差和壁电荷的对应关系,其中,电压差是在图9的驱动波形中供应给扫描电极的电压和供应给维持电极的电压之间的差;
图11A-11D示出根据图9的驱动波形的分配后的壁电荷;
图12示出根据本发明第三示例性实施例的PDP的驱动波形;
图13示出电压差和壁电荷的对应关系,其中,电压差是在图12的驱动波形中供应给扫描电极的电压和供应给维持电极的电压之间的差;以及
图14A-14D示出根据图12的驱动波形的分配后的壁电荷。
具体实施方式
首先,参照图3、4和5详细描述根据本发明示例性实施例的等离子显示设备的简化结构图。如图3所示,该等离子显示设备包括PDP10、机架20、前壳体30和后壳体40。
机架20与PDP10相连,使得机架20布置在图像显示侧的相对侧上。前壳体30布置在PDP10的前侧上,后壳体40布置在机架22的后侧上。前壳体30和后壳体40与PDP和机架20装配在一起,从而形成等离子显示设备。
参照图4,图3所示PDP10包括多个沿列方向排列的寻址电极A1到Am以及多对沿行方向排列的扫描电极Y1到Ym和维持电极X1到Xm,维持电极X1到Xm分别对应于Y1到Ym排列,从而成对布置,并且维持电极的一端公共相连。此外,PDP包括多个扫描电极Y1到Ym和多个维持电极X1到Xm布置于其中的绝缘衬底以及多个寻址电极A1到Am布置于其中的绝缘衬底。所述两个绝缘衬底相对布置,从而在它们之间形成放电空间,这样,扫描电极Y1到Ym和维持电极X1到Xm的延伸方向垂直于寻址电极A1到Am的延伸方向。与图1的PDP相比,放电空间在寻址电极A1到Am与扫描电极Y1到Ym和维持电极X1到Xm相交的位置形成放电单元12。
在图5所示实施例中,机架20包括用于驱动PDP10的板100、200、300、400、500。寻址缓冲板100分别布置在机架20的上部和下部处,并且它们可以由单个板或者多个板组成。图2公开了一种采用双驱动方法的等离子显示设备。但是,当使用单驱动方法时,所述寻址缓冲板100布置在上部或下部的一个空间内。
寻址缓冲板100接收来自图像处理和控制板400的寻址驱动控制信号,并将电压供应到寻址电极A1到Am的每一个上,从而选择需要显示的放电单元。
扫描驱动板200布置在机架20的左部,并且通过扫描缓冲板300与扫描电极Y1到Ym相连。扫描驱动板200接收来自图像处理和控制板400的驱动信号,并且将驱动电压供应给每个扫描电极Y1到Ym。此时,扫描电极接地。
扫描缓冲板300在寻址周期内将电压供应给扫描电极。供应该电压用来顺序选择扫描电极Y1到Ym。
图5中,扫描驱动板200和扫描缓冲板300布置在机架20的左侧,但是扫描驱动板200和扫描缓冲板300可以布置在机架20的右侧。此外,扫描缓冲板300可以与扫描驱动板200集成在一起。
图像处理和控制板400接收外部图像信号,并且生成用来驱动寻址电极的控制信号和用来驱动扫描电极的控制信号,并分别将控制信号供应给寻址驱动板100和扫描驱动板200。供电板500供应所需的电,以便驱动等离子显示设备。图像处理和控制板400和供电板500可以位于机架20的中部。
下文中,将参照图6-13详细描述根据内置在扫描驱动板200和扫描缓冲板300内的驱动电路的驱动波形。
首先,参照图6、7和8描述根据本发明第一示例性实施例的PDP的驱动方法。图6示出根据本发明第一示例性实施例的PDP的驱动波形。其中,图6所示驱动波形对应于供应到扫描电极Y和维持电极X的电压之间的电压差。
首先,根据该示例性实施例,电压没有供应到维持电极X上,驱动脉冲供应给扫描电极Y和寻址电极A。
如图6所示,一个次场包括重置周期、寻址周期、维持周期和擦除周期。重置周期包括上升部分和下降部分。
擦除周期是擦除在前一个次场的维持周期中形成的壁电荷的周期。在擦除周期中,在将最终维持放电电压Vs供应给扫描电极Y之后,供应给扫描电极Y的电压逐渐下降到-Vs电压。但是,保持参考电压。结果,随着电压逐渐下降,维持放电电压Vs被消除,从而在扫描电极Y上形成负壁电荷,在维持电极X上形成正壁电荷。
接下来,在重置周期的上升部分,将Vs电压供应给扫描电极,然后将供应给扫描电极的电压逐渐上升到Vset电压。
然后,在重置周期的下降部分,供应给扫描电极的电压下降到Vs电压,然后供应给扫描电极的电压从Vs电压逐渐下降到-Vnf1。此时,-Vnf1电压高于放电启动电压,并且基本等于供应到扫描电极Y和维持电极X上的电压之间的电压差(-Vnf-Ve)。
在寻址周期内,将没有被选中的扫描电极Y偏压到-Vsc1电压,但是将-Vsc2供应给选中的扫描电极Y。然后,将寻址电压Va供应到由扫描电极Y形成的放电单元中需要被选中的放电单元的寻址电极A上,-Vsc2电压供应给所述扫描电极Y。此时,-Vsc1电压基本等于供应到图2中的扫描电极Y和维持电极X上的电压之间的电压差-Vsch-Ve,并且,-Vsc2电压基本等于供应到图2中的扫描电极Y和维持电极X上的电压之间的电压差-Vsc-Ve。
接下来,在维持周期中,从Vs电压到-Vs电压波动的维持放电脉冲被供应给扫描电极Y。
在第一示例性实施例中,供应给扫描电极的维持放电脉冲被分成第一组1G和第二组2G,以便适当地实现维持放电。第一组1G包括在寻址周期之后供应的第一维持放电脉冲。其中,第一维持放电脉冲的电压Vfs大于供应给第二组2G的维持放电脉冲的电压Vs。该电压Vfs可以设定在Vs和Vsmax之间。该电压Vsmax是当电压Vfs增大时启动误放电的电压。
第一组1G的维持放电脉冲的宽度可以大于第二组2G的维持放电脉冲的宽度。此外,第一组1G的维持放电脉冲的电压可以大于第二组2G的维持放电脉冲的电压,并且同时第一组1G的维持放电脉冲的宽度可以大于第二组2G的维持放电脉冲的宽度。
此外,第一组1G的维持放电脉冲的宽度和电压Vs可以基本等于第二组2G的维持放电脉冲的宽度和电压Vs。
图7示出图6所示驱动波形中电压差和壁电荷之间的关系,所述电压差是供应给扫描电极的电压和供应给维持电极的电压之间的差。图8A示出在图6的驱动波形的(a)部分中分配的壁电荷。图8B示出在图6的驱动波形的(b)部分中分配的壁电荷。图8C示出在图6的驱动波形的(c)部分中分配的壁电荷。图8D示出在图6的驱动波形的(d)部分中分配的壁电荷。图7的壁电荷表示未被寻址的单元上的壁电荷。
此处,“壁电荷”表示形成在靠近放电单元的每个电极上并且积累在该电极上的电荷。该壁电荷被描述成“形成”或“积累”在所述电极上,尽管实际上壁电荷没有接触电极。此外,“壁电压”表示通过壁电荷形成在放电单元的壁上的电势差。
通常,当扫描电极和寻址电极或者扫描电极和维持电极之间的电压变得大于放电启动电压时,在扫描电极和寻址电极或者扫描电极和维持电极之间发生放电。具体地,如本发明第一示例性实施例所示地,当用于放电的斜坡电压逐渐上升或下降时,放电单元的壁电荷也逐渐按照斜坡电压上升或下降的速度减少。
首先,在根据本发明第一示例性实施例的波形中,由于没有电压供应给维持电极X,由外部电压形成的扫描电极Y和维持电极X之间的电压差与供应给扫描电极Y的驱动波形的相同。
如图7所示,在上升部分中,由外电压引起的扫描电极Y和维持电极X之间的电压差从Vs电压逐渐上升到Vset电压。这样,当供应逐渐上升的斜坡电压而发生放电时,放电单元中的壁电压Vw也按照所供应的电压上升的速度逐渐减小。此时,当由外电压引起的扫描电极Y和维持电极X之间的电压差变得大于放电启动电压Vf时,发生重置放电,并且,在扫描电极上形成负壁电荷,在维持电极和寻址电极上形成正电荷,如图8A所示。
然后,在下降部分,由外电压引起的扫描电极Y和维持电极X之间的电压差从Vs电压逐渐下降到-Vnf1电压。此时,在供应下降的斜坡电压之前,由于在扫描电极上形成负壁电荷,在维持电极和寻址电极上形成正电荷,因此生成预定量壁电荷。当壁电荷Vw和供应电压Vin之间的电压差变得大于放电启动电压Vf时,发生微弱的放电,并且壁电荷Vw按照与供应电压Vin相同的速度减少。然后,如图8B所示,擦除形成在扫描电极上的负壁电荷以及形成在维持电极和寻址电极上的正壁电荷。此时,供应到扫描电极Y上的最终电压大于放电启动电压,因此,扫描电极Y的壁电荷没有被完全擦除,一些壁电荷保留在扫描电极Y上。
然后,在寻址周期内,选择通电和断电的单元,在通电单元(被寻址单元)上积累壁电荷。此时,由于在未被寻址的单元中不发生放电,在重置周期中由最终电压形成的壁电压如图7地保持。
接下来,在维持周期内,用于维持放电的第一维持放电脉冲的电压Vfs被供应给扫描电极。此时,由于在寻址周期内未被寻址的单元中没有发生放电,所以图8C所示壁电荷条件和图8B所示壁电荷条件相同。所以,当正电压Vfs被供应给扫描电极时,该电压变得小于放电启动电压。因此不发生放电。然后,当供应第二维持放电脉冲电压-Vs时,该负电压-Vs被供应到扫描电极上,在扫描电极上形成有负壁电荷。所以,可能在没有正确擦除壁电荷的单元中发生误放电,或者在具有许多较大颗粒的单元和非常规单元中发生误放电。
下文中,参照图9、10、11A至11D、12、13和14A至14D详细描述驱动波形,该驱动波形用于阐明在维持周期内未被寻址的单元中发生误放电的问题。
首先,参照图9、10和11A至11D描述根据本发明的第二示例性实施例的波形。图9示出根据本发明第二示例性实施例的PDP的驱动波形。图10示出电压差和壁电荷之间的对应关系,电压差是在图9的驱动波形中供应给扫描电极的电压和供应给维持电极的电压的差。图11A示出根据图9的驱动波形在(e)周期内分配的壁电荷。图11B示出根据图9的驱动波形在(f)周期内分配的壁电荷。图11C示出根据图9的驱动波形在(g)周期内分配的壁电荷。图11D示出根据图9的驱动波形在(h)周期内分配的壁电荷。
如图9所示,供应给扫描电极的电压从Vs电压下降到-Vnf2电压。此时,-Vnf2电压与放电驱动电压相同,并且小于在维持周期内供应给扫描电极Y的-Vs电压。这样,如图11B所示,如图11A所示形成在上升部分中的壁电荷得到正确的擦除。图10示出壁电荷形成的壁电压。
然后,如图11C和11D所示,在维持周期内未被寻址的单元的壁电荷条件基本与图11B所示壁电荷的条件相同。此时,即使当用于维持放电脉冲的电压被供应时,也不发生放电。所以,维持周期内的壁电荷条件与图11B所示壁电荷条件相同。
接下来,参照图12、13以及图14A到14D描述根据本发明第三示例性实施例的驱动波形。图12示出根据本发明第三示例性实施例的PDP的驱动波形。图13示出根据电压差和壁电荷之间的对应关系,其中电压差是在图12所示驱动波形中供应给扫描电极和供应给维持电极的电压差。图14A示出根据图12的驱动波形在(i)周期内分配的壁电荷。图14B示出根据图12的驱动波形在(j)周期内分配的壁电荷。图14C示出根据图12的驱动波形在(k)周期内分配的壁电荷。图14D示出根据图12的驱动波形在(k)周期内分配的壁电荷。
如图12所示,在重置周期的上升部分中,首先将Vs电压供应给扫描电极。然后,供应给扫描电极的电压逐渐上升到Vset,同时寻址电压Va被供应给寻址电极。此时,如图13所示,扫描电极Y和寻址电极A之间的电压差从Vs-Va电压逐渐上升到Vset-Va电压。所以,放电发生的时间比应用图6所示波形时的放电时间晚。所以,如图14A所示,形成在扫描电极Y、维持电极X和寻址电极A上的壁电荷的量减小,由壁电荷形成的壁电压也减小。即使在重置周期的下降部分内供应到扫描电极Y上的最终电压大于在图6所示维持周期内用于维持放电的电压中的最小电压,如图14B所示,在重置周期的上升部分中形成在每个电极上的壁电荷可以被擦除。
所以,如图14C到14D所示,在波形的维持周期内未被寻址的单元中的壁电荷条件与图14B的壁电荷条件相同,当在如此条件下供应用于维持放电的电压时,不发生放电。所以,如图14B所示地保持维持放电中的壁电荷条件。
如上所述,根据本发明,当给维持电极施加预定电压的偏压时,将驱动波形供应给扫描电极,并且因此除去了用于驱动维持电极的板。即,通过使用两个板使PDP基本得到驱动,从而减少用于板的成本。
尽管已经参照本发明的实施方式对本发明进行了描述,但是应该理解,本发明并不限于所公开的实施方式,相反地,本发明覆盖包括在权利要求限定的精神和范围内的各种修改和等效设置。
Claims (12)
1、一种驱动等离子显示板的方法,所述等离子显示板包括多个第一电极、多个第二电极和多个在垂直于所述第一和第二电极的方向上延伸的第三电极,该等离子显示板对应于具有次场的波形,该波形具有重置周期、寻址周期和维持周期,该方法包括:
在重置周期、寻址周期和维持周期内以第一电压对所述第二电极施加偏压;
将所述第一电极的电压从第二电压增大到第三电压;以及
在重置周期内将所述第一电极的电压从第四电压减小到第五电压,其中,所述第五电压小于在维持周期中用于维持放电的电压的最小值。
2、如权利要求1所述的驱动等离子显示板的方法,其中,所述第一电压是接地电压。
3、如权利要求1所述的驱动等离子显示板的方法,其中,所述第五电压和所述第一电压之间的电压差是放电启动电压。
4、一种驱动等离子显示板的方法,所述等离子显示板包括多个第一电极、多个第二电极和多个在垂直于所述第一和第二电极的方向上延伸的第三电极,以及具有重置周期、寻址周期和维持周期的次场,该方法包括:
在重置周期、寻址周期和维持周期内以第一电压对所述第二电极施加偏压;
将所述第一电极的电压从第二电压增大到第三电压,并且对第三电极施加第四电压;以及
在重置周期内将所述第一电极的电压从第五电压减小到第六电压,并且对所述第三电极施加第七电压。
5、如权利要求4所述的驱动等离子显示板的方法,其中,所述第四电压对应于施加到用于形成在寻址周期中需要被选中的放电单元的所述第三电极上的电压。
6、如权利要求4所述的驱动等离子显示板的方法,其中,所述第七电压对应于施加到用于形成在寻址周期中不需要被选中的放电单元的所述第三电极上的电压。
7、一种驱动等离子显示板的方法,所述等离子显示板具有扫描电极、维持电极和寻址电极,所述电极由具有重置周期、随后的寻址周期、随后的维持周期和随后的擦除周期的相应驱动波形驱动,该方法包括:
对所述扫描电极进行如下操作:
在所述重置周期的第一部分期间对所述扫描电极施加上升电压;
在所述第一部分之后,在所述重置周期的第二部分期间对所述扫描
电极施加第一下降电压;
在寻址周期内,对所述扫描电极施加偏压电压,该电压水平与没有
被寻址的放电单元的相同,对所述扫描电极施加寻址电压,该电压水平
与被寻址的放电单元的相同;
在维持周期内,对所述扫描电极施加交流电压,该电压水平与维持
放电脉冲的相同;和
在擦除周期内,对所述扫描电极施加第二下降电压;以及
将维持电极保持在接地电势。
8、如权利要求7所述的方法,还包括在寻址周期内除了对放电单元寻址的时间之外将寻址电极保持在接地电势。
9、如权利要求7所述的方法,还包括除了在所述重置周期的第一部分期间和在寻址周期内对放电单元寻址的时间之外,将所述寻址电极保持在接地电势。
10、如权利要求7所述的方法,其中,在所述维持周期内的所述交流电压水平维持放电脉冲包括第一维持放电脉冲组和随后的第二维持放电脉冲组。
11、如权利要求10所述的方法,其中,所述第一维持放电脉冲组的电压水平高于所述第二维持放电脉冲组的电压水平。
12、如权利要求10所述的方法,其中,所述第一维持放电脉冲组的脉冲宽度大于所述第二维持放电脉冲组的脉冲宽度。
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KR100778454B1 (ko) * | 2006-11-17 | 2007-11-21 | 삼성에스디아이 주식회사 | 플라즈마 표시 장치 및 그 구동 방법 |
KR100786876B1 (ko) * | 2006-12-27 | 2007-12-20 | 삼성에스디아이 주식회사 | 플라즈마 표시 장치 및 그 구동 방법 |
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JP3156659B2 (ja) * | 1998-01-09 | 2001-04-16 | 日本電気株式会社 | プラズマディスプレイパネル及びその駆動方法 |
JP3201603B1 (ja) | 1999-06-30 | 2001-08-27 | 富士通株式会社 | 駆動装置、駆動方法およびプラズマディスプレイパネルの駆動回路 |
KR100433213B1 (ko) | 2001-09-14 | 2004-05-28 | 엘지전자 주식회사 | 플라즈마 디스플레이 패널의 구동방법 및 장치 |
KR100420022B1 (ko) | 2001-09-25 | 2004-02-25 | 삼성에스디아이 주식회사 | 어드레스 전위 가변의 플라즈마 디스플레이 패널 구동방법 |
KR100458569B1 (ko) | 2002-02-15 | 2004-12-03 | 삼성에스디아이 주식회사 | 플라즈마 디스플레이 패널의 구동방법 |
KR100475161B1 (ko) * | 2002-04-04 | 2005-03-08 | 엘지전자 주식회사 | 플라즈마 디스플레이 패널의 구동방법 |
AU2003262013A1 (en) | 2002-10-02 | 2004-04-23 | Fujitsu Hitachi Plasma Display Limited | Drive circuit and drive method |
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2004
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2005
- 2005-01-26 US US11/044,869 patent/US7561148B2/en not_active Expired - Fee Related
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CN100437691C (zh) | 2008-11-26 |
KR20050078451A (ko) | 2005-08-05 |
US20050168407A1 (en) | 2005-08-04 |
US7561148B2 (en) | 2009-07-14 |
KR100578965B1 (ko) | 2006-05-12 |
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