CN1698081A - 等离子显示面板的驱动方法 - Google Patents

等离子显示面板的驱动方法 Download PDF

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CN1698081A
CN1698081A CNA2004800005048A CN200480000504A CN1698081A CN 1698081 A CN1698081 A CN 1698081A CN A2004800005048 A CNA2004800005048 A CN A2004800005048A CN 200480000504 A CN200480000504 A CN 200480000504A CN 1698081 A CN1698081 A CN 1698081A
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橘弘之
若林俊一
木子茂雄
长尾宣明
小川兼司
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Panasonic Holdings Corp
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Abstract

一种具有多个着火电极的等离子显示面板的驱动方法，在多个扫描电极之中，施加于伴随自己的扫描产生着火放电并进行写入的扫描电极上的扫描脉冲的脉宽，长于施加于伴随自己的扫描不产生着火放电并进行写入的扫描电极上的扫描脉冲的脉宽。

Description

等离子显示面板的驱动方法
技术领域
本发明、涉及等离子显示面板的驱动方法。
背景技术
等离子显示面板(以下略记为PDP或面板)、是以大画面、薄型、轻量为特征的观看性优越的显示装置。作为PDP的放电方式，有AC型和DC型；作为电极构造有3电极表面放电型和对向放电型。但目前、从高精细化要求、及制造的容易性出发，AC型加以表面放电型的AC型且3电极PDP逐渐成为主流。
AC型3电极PDP、一般是在对向设置的前面板和背面板间形成多个放电单元构成。前面板，在前玻璃基板上相互平行地多对形成有由扫描电极和维持电极构成的显示电极、并形成有电介质层和保护层来覆盖这些显示电极。背面板，分别形成有：位于背玻璃基板上的多个平行数据电极；覆盖它们的电介质层；以及，位于其上的与数据电极平行的多个的障壁，且在电介质层表面及障壁的侧面上形成有荧光体层。然后、将前面板和背面板对向密封使得显示电极和数据电极立体交叉、并在内部的放电空间里的封入放电气体。在如此构成的面板中、各放电单元内通过气体放电产生紫外线、用这些紫外线激励RGB各种颜色的荧光体使其发光，从而进行彩色显示。
作为驱动面板的方法，一般是把1个场周期(field-period)分成多个子场(sub-field)、再利用发光的子场的组合进行灰度显示、即所谓的子场法。这里、各子场有初始化期间、写入期间以及维持期间。
在初始化期间，所有的放电单元一齐进行初始化放电，清除与之前的各个放电单元对应的壁电荷的历史，并且形成继续写入动作所需的壁电荷。并且、有产生用于使写入放电稳定产生的着火((priming)用作放电的起爆剂＝激励粒子)的作用。
在写入期间、给扫描电极施加顺序扫描脉冲的同时、给数据电极施加对应要显示的图像信号的写入脉冲，在扫描电极和数据电极之间有选择地引起写入放电、进行选择性的壁电荷形成。
在持续维持期间、向扫描电极与维持电极之间施加规定次数的维持脉冲、并有选择地使通过写入放电生成壁电荷的放电单元放电并发光。
如上所述、要想正确显示图像，在写入期间确实地进行选择性写入放电很重要，但因电路结构上的制约写入脉冲无法使用高电压、在数据电极上形成的荧光体层难以引起放电等，使写入放电的放电延迟变大的因素很多。因此、使写入放电稳定产生的着火非常重要。
然而、由放电产生的着火随着时间的推移迅速减少。因此、上述的面板驱动方法、对于从初始化放电经过了较长时间的写入放电而言，初始化放电产生的着火不足、使放电延迟变大，从而令写入动作不稳定而产生图像显示质量降低的问题。或者、为使写入动作稳定进行，将写入时间设定较长、其结果就是，会出现写入期间所花费的时间过长的问题。
为了解决所述问题、提出有一种，在面板上设置辅助放电电极，利用辅助放电产生的着火，减小放电延迟的面板及其驱动方法(参照特开2002-297091号公告)。
然而、在这些面板中、由于辅助放电本身的放电延迟大而导致写入放电的放电延迟不能充分缩短、或者辅助放电的动作边缘过小、有时会有面板诱发误放电的问题。
进而、如果在写入放电的放电延迟尚未充分缩短时就增加扫描电极数量以求高精细化，就会由于使消耗在写入期间上的时间变长、消耗在维持期间上的时间不足，结果引起亮度降低的问题。另外，若为了提高亮度和效率提高氙分压，还会产生放电延迟进一步增大而导致写入动作不稳定的问题。
本发明正是鉴于上述课题进行的发明，其目的在于：提供一种可使写入动作稳定且高速进行的等离子显示面板的驱动方法。
发明内容
为了解决上述课题，本发明的等离子显示面板的驱动方法，其特征是：在写入期间，施加于伴随自己的扫描不产生着火放电并进行写入的扫描电极上的扫描脉冲的脉宽，短于施加于伴随自己的扫描产生着火放电并进行写入的扫描电极上的扫描脉冲的脉宽。
附图说明
图1为表示本发明的实施方式所用的面板的一例的剖面图。
图2为表示同一面板的背基板一侧的构造的斜视示意图。
图3为表示同一面板的电极排列图。
图4为表示同一面板的驱动方法的驱动波形图。
图5为表示实施同一面板的驱动方法的驱动装置的电路模块的一例的图。
具体实施方式
以下对本发明的实施方式中的等离子显示面板的驱动方法，用附图进行说明。
(实施方式)
图1为表示本发明的实施方式中所用的面板的一例的剖面图；图2表示同一面板的背基板一侧的示意斜视图。
如图1所示，玻璃制的前基板1和背基板2夹着放电空间对向配置，放电空间里封入通过放电放射紫外线的氖和氙的混合气体。
在前基板1上，多个扫描电极6和维持电极7互相平行成对，并且、按照维持电极7-扫描电极6-扫描电极6-维持电极7-维持电极7-扫描电极6-…方式每2根一组交互排列而成。扫描电极6和维持电极7各自由透明电极6a、7a、和透明电极6a、7a上形成的金属母线6b、7b构成。这里，扫描电极6之间以及维持电极7之间、设置了由黑色材料构成的光吸收层8。然后，相邻的扫描电极6之中、一方的扫描电极6的金属母线6b的突出部分6b’，是突出到光吸收层8之上而成的。然后，覆盖所述的扫描电极6、维持电极7以及光吸收层8形成电介质层4以及保护层5。
在背基板2上、形成多个相互平行的数据电极9；覆盖所述数据电极9形成电介质层15；再在其上面形成将放电单元11分隔出来的障壁10。障壁10如图2所示，在与数据电极9平行的纵壁部10a、和构成放电单元11及放电单元11之间间隙部13的横壁部10b构成。在间隙部13之中、与扫描电极6的突出部分6b’相对的间隙部13里，着火电极14在与数据电极9正交的方向上形成并构成着火单元13a。就是说着火电极14并非在全部间隙部13内都设置、而是在间隙部13之中间隔一个的着火单元13a上设置。然后，在与放电单元11对应的电介质层15的表面和障壁10的侧面上设置荧光体层12。但是，在间隙部13一侧不设置荧光体层12。
当将前基板1和背基板2对向配置并进行密封时，在前基板1上形成的扫描电极6的金属母线6b中突出到光吸收层8上的突出部分6b’，放置为与背基板2上形成的着火电极14平行、且在着火单元13a中相对。即、图1、图2所示的面板形成为：在前基板1一侧上形成的突出部分6b’和、背基板2一侧上形成的着火电极14之间，具有进行着火放电的着火单元13a的结构。
另外，图1、图2中还形成有覆盖着着火电极14的电介质层16。
这里、为了使着火放电容易产生，在着火单元13a上没有设置对放电起阻碍作用的荧光体层12。还有，由于扫描电极6的突出部分6b’与着火电极14之间间隔、比数据电极9与扫描电极6的间隔短，因此着火放电与写入放电相比放电开始电压低从而放电容易产生。
图3为表示本发明实施方式所用的面板的电极排列图。沿列方向排列m列的数据电极D1～Dm(图1的数据电极9)；沿行方向2根一组交互排列n行的扫描电极SC1～SCn(图1的扫描电极6)及n行的维持电极SU1～SUn(图1的维持电极7)，形成维持电极SU1-扫描电极SC1-扫描电极SC2-维持电极SU2-…的排列方式。于是，在本实施方式中，只在第奇数行的扫描电极SC1、SC3、…上设置突出部分6b’，与这些扫描电极SC1、SC3、…的突出部分相对、排列n/2行着火电极PR1、PR3、…(图1的着火电极14)。
于是，在放电空间内形成m×n个包含：1对扫描电极SCi、维持电极SUi(i＝1～n)，和1个数据电极Dj(j＝1～m)的放电单元Cij(图1的放电单元11)；形成n/2行包含扫描电极SCp(p＝奇数)的突出部分6b’和着火电极PRp的着火单元Pp(图1的着火单元13a)。
这样本发明的实施方式所用的面板之中，第奇数行的扫描电极SCp带有突出部分6b’，是伴随自己的扫描发生着火放电、并且进行写入的扫描电极；另一方面第偶数行的扫描电极SCp+1没有突出部分6b’，构成伴随自己的扫描不产生着火放电而进行写入的扫描电极。
以下，对用于驱动面板的驱动波形及其时序进行说明。
图4为，表示本发明实施方式所用面板的驱动方法的驱动波形图。再者在本实施方式中，1个场周期虽然由包含初始化期间、写入期间、维持期间的多个子场构成，但由于各个子场除了在维持期间内的维持脉冲数不同以外做同样的动作，所以以下只对1个子场的动作进行说明。
在初始化期间前半部分，使数据电极D1～Dm、维持电极SU1～SUn以及着火电极PR1～PRn-1各自保持0(V)。在扫描电极SC1～SCn上，施加从小于对维持电极SU1～SUn的放电开始电压的电压Vi1开始、向超过放电开始电压的电压Vi2平缓上升的倾斜波形电压。在此倾斜波电压上升过程中，在扫描电极SC1～SCn与维持电极SU1～SUn、数据电极D1～Dm、着火电极PR1～PRn-1之间分别引起第一次微弱的初始化放电，并在扫描电极SC1～SCn上部积累负的壁电压，并且在数据电极D1～Dm上部、维持电极SU1～SUn上部及着火电极PR1～PRn-1上部积累正的壁电压。这里，所谓的电极上积累的壁电压，表现为由覆盖电极的电介质层上积累的壁电荷产生的电压。
在初始化期间后半部分，使维持电极SU1～SUn保持为正电压Ve。在扫描电极SC1～SCn上，施加从小于对维持电极SU1～SUn的放电开始电压的电压Vi3开始、向超过放电开始电压的电压Vi4平缓下降的倾斜波形电压。在此期间，在扫描电极SC1～SCn与维持电极SU1～SUn、数据电极D1～Dm、着火电极PR1～PRn-1之间分别引起第2次微弱的初始化放电。然后，扫描电极SC1～SCn上部的负的壁电压以及维持电极SU1～SUn上部的正的壁电压变小，且数据电极D1～Dm上部的正的壁电压被调整到适合写入动作的值，着火电极PR1～PRn-1上部正的壁电压也被调整到适合着火动作的值。到此初始化动作结束。
在写入期间，将扫描电极SC1～SCn暂时保持为电压Vc。而后，在着火电极PR1～PRn-1上施加与电压变化值(Vc-Vi4)几本相等的电压Vq。
接下来，在第1行的扫描电极SC1上施加扫描脉冲Va。于是，在着火电极PR1与扫描电极SC1的突出部分6b’之间产生着火放电，在第1行扫描电极SC1对应的第1行放电单元C1，1～C1，m与第2行扫描电极SC2对应的第2行放电单元C2，1～C2，m内部使着火扩散开来。此时的放电如上所述，由于是容易放电的结构，因此可以获得放电延迟较小且快速稳定的着火放电。
与此同时，在数据电极D1～Dm之中、对应第1行应该显示的图像信号相应的数据电极Dk(k表示从1～m的整数)上，施加正的写入脉冲电压Vd。于是，在施加写入脉冲电压Vd的数据电极Dk与扫描电极SC1的交叉部分产生放电，并发展成对应的放电单元C1，k的维持电极SU1和扫描电极SC1之间的放电。然后、在放电单元C1，k的扫描电极SC1上部积累正电压、在维持电极SU1上部积累负电压，第1行的写入动作结束。如上所述，在第1行的扫描期间，由于着火放电和写入放电连续产生，所以施加于第1行的扫描电极SC1上的扫描脉冲的脉宽是着火放电所需时间tp与写入放电所需时间tw的和tp+tw。
这里，第一行扫描电极SC1，是伴随着自己的扫描产生着火放电，同时进行写入的扫描电极。然后，由于放电单元C1，k的放电，是从扫描电极SC1与着火电极PR1之间发生的着火放电中不断供给着火而发生的，因此尽管有从着火单元到着火供给开始的时间延迟，在着火供给后还是能形成放电延迟小且稳定的放电。
接下来，在第2行扫描电极SC2上施加脉宽比第1行的脉宽窄的扫描脉冲电压Va。与此同时，在数据电极D1～Dm之中、对应第2行所应该显示的图像信号对应的数据电极Dk上，施加正的写入脉冲电压Vd。于是，在数据电极Dk和扫描电极SC2的交叉部分产生放电，并进展为对应的放电单元C2，k的维持电极SU2和扫描电极SC2之间的放电。然后，在放电单元C2，k的扫描电极SC2上部积累正电压、在维持电极SU2上部积累负电压，第2行的写入动作结束。
这里，施加于第2行的扫描电极SC2的扫描脉冲的脉宽，比第1脉宽、即tp+tw短的理由如下。第2行扫描电极SC2是伴随自己的扫描不产生着火放电而进行写入的扫描电极；放电单元C2，k的放电，是在从扫描电极SC1与着火电极PR1之间发生的着火放电中获得了充分的着火的状态下发生的。因此、无需将着火放电所需时间tp考虑进来。当然，这时的写入放电的放电延迟非常小、并能形成稳定的放电。
以下同样地，在第3行的扫描电极SC3上施加具有第1脉宽tp+tw的扫描脉冲的同时，在数据电极Dk上施加写入脉冲。于是，首先、着火电极PR3与扫描电极SC3之间产生着火放电，向第3行和第4行的放电单元C3，1～C3，m与放电单元C4，1～C4，m内部供给着火。继而，在与施加了写入脉冲电压的数据电极Dk对应的放电单元C3，k上产生写入放电。
接下来，在第4行的扫描电极SC4上施加具有脉宽tw的扫描脉冲的同时、在数据电极Dk上施加正的写入脉冲。于是，在对应的放电单元C3，k上，在已经获得的着火的影响下，产生放电延迟非常小且稳定的写入放电。
同样的写入动作一直进行到第n行的放电单元Cn，k，写入动作完成。
如上所述，在第奇数行的放电单元Cp，1～Cp，m(p＝奇数)的写入动作过程中，在扫描电极SCp上施加具有第1脉宽tp+tw的扫描脉冲的同时、在数据电极Dk上施加写入脉冲。于是，首先、着火电极PRp与扫描电极SCp之间产生着火放电，并向放电单元Cp，1～Cp，m和放电单元Cp+1，1～Cp+1，m内部供给着火。其后继续在与施加了写入脉冲电压的数据电极Dk对应的放电单元Cp，k上产生写入放电。
其次，在第偶数行的放电单元Cp+1，1～Cp+1，m的写入动作过程中，在第p+1行的扫描电极SCp+1上施加具有脉宽tw的扫描脉冲的同时，在数据电极Dk上施加写入脉冲。于是、在对应的放电单元Cp+1，k上，受得到的着火的影响，产生放电延迟非常小且稳定的写入放电。
在维持期间，当扫描电极SC1～SCn及维持电极SU1～SUn一回到0(V)后，就在扫描电极SC1～SCn上施加正的维持脉冲电压Vs。这时，引起写入放电的放电单元Ci，j中的扫描电极SCi上部和维持电极SUi上部之间的电压，加到维持脉冲电压Vs之上，在写入期间由于加上了扫描电极SCi上部及维持电极SUi上部积累的壁电压而超过放电开始电压，从而产生维持放电。以下同样地，通过在扫描电极SC1～SCn及维持电极SU1～SUn上交替施加维持脉冲，对于引起写入放电的放电单元Ci，k而言不断进行维持脉冲次数个维持放电。
如上所述，本发明的实施方式所用的面板驱动方法中的写入放电，与以往的驱动方法中的初始化放电只依赖于着火的写入放电不同，是在从与各放电单元的写入动作同时或者稍早产生的着火放电中提供了充分着火的状态下进行的。从而，可以实现放电延迟小、高速且稳定的写入放电，能够显示高质量的图像。
还有，由于着火单元附近的电极只有着火电极14和扫描电极6，因此不用担心着火放电会引起其他无用放电、如包含维持电极在内的误放电等，从而有令着火放电本身的动作稳定的优点。
再者，由于AC型PDP的各电极被电介质层包围着、与放电空间绝缘，因此直流成分对放电本身不起任何作用。因此，使用在本发明的实施方式所说明的驱动波形中加了直流成分的波形，当然也能获得同样的效果。
图5是表示实施本发明的实施方式所用面板的驱动方法的驱动装置电路模块的图。本实施方式中的驱动装置100，具有：图像信号处理电路101、数据电极驱动电路102、定时控制电路103、扫描电极驱动电路104、维持电极驱动电路105、以及着火电极驱动电路106。图像信号及同步信号，被输入到图像信号处理电路101。图像信号处理电路101，根据图像信号及同步信号，将对是否点亮各子场进行控制的子场信号、输出给数据电极驱动电路102。另外，同步信号也输入到定时控制电路103。定时控制电路103根据同步信号，向数据电极驱动电路102、扫描电极驱动电路104、维持电极驱动电路105、着火电极驱动电路106输出定时控制信号。
数据电极驱动电路102，根据子场信号以及定时控制信号，对面板的数据电极(图3的数据电极D1～Dm)施加规定的驱动波形。扫描电极驱动电路104根据定时控制信号，对面板的扫描电极(图3的扫描电极SC1～SCn)施加规定的驱动波形；维持电极驱动电路105，根据定时控制信号，对面板的维持电极(图3的维持电极SU1～SUn)施加规定的驱动波形。着火电极驱动电路106，根据定时控制信号，对面板的着火电极(图3的着火电极PR1～PRn-1)施加规定的驱动波形。数据电极驱动电路102、扫描电极驱动电路104、维持电极驱动电路105、着火电极驱动电路106中，从电源电路(未图示)获取所需的电力。
通过具备以上的电路模块，构成可以实施本实施方式中的面板的驱动方法的驱动装置。
通过上述本发明，能够提供一种可使写入动作稳定且高速进行的等离子显示面板的驱动方法。
通过如上所述的本发明的等离子显示面板的驱动方法，由于可以使写入动作稳定且高速进行，因此作为等离子显示面板的驱动方法是有用的。

Claims (1)

1.一种等离子显示面板的驱动方法，具有相互平行配置的多个扫描电极及多个维持电极、和在与所述扫描电极交叉的方向上配置的多个数据电极，且1个场周期由多个具有初始化期间、写入期间及维持期间的子场构成，其特征在于：
等离子显示面板具有多个着火电极，所述着火电极与所述扫描电极平行，并在与对应的扫描电极之间产生着火放电；
在所述写入期间，所述扫描电极之中，施加于伴随自己的扫描不产生着火放电并进行写入的扫描电极上的扫描脉冲的脉宽，短于施加于伴随自己的扫描产生着火放电并进行写入的扫描电极上的扫描脉冲的脉宽。
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