CN1619618A - 等离子显示板驱动方法 - Google Patents
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- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
- G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
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- G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
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Abstract
一种驱动显示板的方法,该显示板包括第一电极、第二电极、以及与第一和第二电极交叉以形成放电单元的寻址电极。该方法包括:在维持周期期间,交替施加电压脉冲给第一和第二电极,并浮置第一或者第二电极并将其保持在第一电压电平,同时将该电压脉冲施加给另一电极。
Description
相关申请的交叉引用
本申请要求2003年10月29日提交的韩国专利申请第10-2003-0075930号的优先权及权益,为了这里提出的所有目的通过引用而合并其中。
技术领域
本发明涉及一种显示板。更具体地,本发明涉及一种增加面板效率的等离子显示板(PDP)的驱动方法。
背景技术
PDP是使用通过气体放电过程生成的等离子体来显示字符或图像的平板显示器,并根据其尺寸而以矩阵形式在其上提供几万到上百万个像素。根据提供的驱动电压波形和放电单元结构,将这些PDP分类为直流(DC)PDP和交流(AC)PDP。
图1示出了传统AC PDP的透视图。
如图所示,在第一玻璃基板1的下面形成由介电层2和保护膜3覆盖的一对平行的扫描电极4和维持电极5。在第二玻璃基板6上形成被绝缘层7所覆盖的多个寻址电极8。屏蔽条(barrier rib)9形成在寻址电极8之间并与寻址电极8平行,并且荧光体(phosphor)10形成在绝缘层7上和屏蔽条9的两侧上。在其间具有放电空间11的第一和第二玻璃基板1和6密封在一起,使得扫描电极4和维持电极5与寻址电极8正交。寻址电极8与一对扫描电极4和维持电极5交叉的一部分放电空间11形成放电单元12。
图2示出了典型PDP电极排列。
如图所示,PDP电极以m×n矩阵结构排列。寻址电极A1到Am沿列方向排列,而扫描电极Y1到Yn和维持电极X1到Xn沿行方向交替地排列。放电单元12对应于图1中的放电单元12。。
图3示出了传统PDP驱动波形。
如图所示,根据传统PDP驱动方法,每一个子场具有复位周期、寻址周期、和维持周期。
在复位周期中,擦除由前一个维持放电形成的壁电荷,并复位该单元的状态,使得顺利执行下一寻址操作。在寻址周期中,选择将要被导通的板单元,并在导通的单元(寻址单元)上积累壁电荷。在维持周期中,通过交替施加维持脉冲给X电极和Y电极,而执行用于在寻址单元上显示图像的放电。传统上,通过施加维持脉冲给X或Y电极并同时保持另一个电极为地电压电平,可对每一个维持脉冲产生一个强维持放电。强维持放电可产生过多的点火颗粒(priming particles),而其不能在随后的操作中使用,因此降低了PDP的效率。
发明内容
本发明通过减少和再利用在维持放电时产生的点火颗粒而提供了增加的PDP效率和减少的功率损耗。
本发明的其它特征将在随后的描述中阐述,并且本发明的部分特征从描述中将显而易见,或可以通过本发明的实践而获悉。
本发明公开了一种驱动等离子显示板的方法,该等离子显示板具有平行形成在第一基板上的第一电极和第二电极,以及与第一电极和第二电极交叉并形成在第二基板上的寻址电极。该方法包括在维持周期期间交替施加电压脉冲给第一和第二电极,并且浮置(floating)第一电极或者第二电极并将其维持在第一电压电平,同时将该电压脉冲施加给第一和第二电极中的另一个。
本发明还公开了一种PDP,包括第一和第二基板、平行形成在第一基板上的第一和第二电极、以及形成在第二基板上的寻址电极。在寻址周期和维持放电周期期间,驱动电路产生驱动信号给第一、第二、和寻址电极。在维持周期期间,驱动电路交替施加电压脉冲给第一和第二电极,并且浮置第一或第二电极之一并将其维持在第一电压电平,同时将该电压脉冲施加给另一电极。
本发明也公开了一种对放电单元进行维持放电的方法,该放电单元由第一电极、第二电极、以及与第一电极和第二电极交叉的寻址电极形成。该方法包括施加第一电压脉冲给第一电极,并当施加第一电压脉冲给第一电极时,浮置第二电极并然后在第二电极维持第一电压电平。
可以理解,前面概括性的描述和下面详细描述都是说明性和解释性的,并意欲为权利要求提出的本发明提供进一步的解释。
附图说明
合并其中并构成说明书的一部分并提供对发明的进一步理解的附图图示了本发明的实施例,其和描述一起用来解释本发明的原理。
图1是示出了传统AC PDP的部分透视图。
图2示出了典型PDP电极排列。
图3示出了传统PDP驱动波形。
图4示出了根据本发明示范实施例的PDP驱动波形。
图5示出了图4的PDP驱动波形中的维持周期的一部分的放大曲线图。
具体实施方式
下面的详细描述仅通过图示实现本发明的发明人预期的最佳模式而示出并描述了本发明的示范实施例。正如将认识到的那样,可以在不脱离本发明的情况下对本发明的各明显方面进行改进。因此,附图和描述被认为是实质上说明性的,而不是限制性的。为了清楚地阐述本发明,省略说明书中没有描述到的部件,并且提供有相似描述的部件具有相同的附图标记。
如下面所描述的一样,壁电荷代表形成在电极附近的放电单元的壁(例如,介电层)上的电荷。壁电荷实际上并不与电极接触,但是它们被描述为“形成”、“充电”、或者“聚集”在电极上。壁电压表示根据壁电荷而形成在放电单元壁上的势差。
图4示出了根据本发明示范实施例的PDP驱动波形曲线图。
如图所示,一个子场包括复位周期、寻址周期、和维持周期。
在根据本发明示范实施例的维持周期中,维持脉冲交替施加给X电极和Y电极,X电极和Y电极中没有施加维持脉冲的电极被浮置并维持在低电压电平。换句话说,当将维持脉冲施加给X电极时,Y电极被浮置并维持在低电压电平。接着,维持脉冲被施加给Y电极,X电极被浮置并维持在低电压电平。这个过程可持续整个维持周期。
图4示出了当Y电极被浮置并保持在0V时,具有施加给X电极的Vs电压的维持脉冲,和当X电极被浮置并保持在0V时,具有施加给Y电极的Vs电压的维持脉冲。Vs电压是在寻址单元产生维持放电的电压电平。
图5示出了图4所示的PDP驱动波形中的维持周期的一部分的放大曲线图。
如图所示,具有Vs电压的维持脉冲被施加给X电极,并且在维持脉冲产生放电之前,Y电极被浮置。通常,如美国专利第4866349号、美国专利第5081400号和美国专利申请第2003-0080925号所公开的,当维持脉冲施加给X或者Y电极时,为了再利用无功功率,使用电感器和电容组件之间的谐振的功率恢复电路可以形成在放电空间上。当使用功率恢复电路时,维持脉冲以预定梯度从0V增加到Vs电压。
由于电容组件形成在X、Y、和A电极之间,所以当X电极的电压从0V增加到Vs电压时,浮置的Y电极的电压也增加了,但是由于寻址电极A维持在恒定电压,所以浮置的Y电极的电压增加的速率比X电极的慢。
因此,X和Y电极之间的压差逐渐地增加,并且当压差结合壁电压超过放电启动电压时,产生第一放电。
如图5所示,浮置Y电极的周期可以包括维持脉冲的整个上升区间。此外,在因为X电极电压的上升而产生维持放电之前,或者当产生维持放电的时间不超过整个放电时间的50%时,Y电极能被浮置,而在X电极电压的上升开始时间不浮置Y电极。因此,在X电极的电压增加时Y电极被浮置。
当Y电极被浮置后给Y电极施加0V电压时,X电极和Y电极之间的压差迅速增加。在这种情况下,X和Y电极之间的压差超过了放电启动电压,并在放电单元中产生第二放电。
一旦电极被浮置,则期望在第一维持放电结束的1μs内施加低电压给该电极。上述功率恢复电路的谐振可用来将浮置电极的电压降低到0V。
通过重复交替施加维持脉冲给X和Y电极、浮置没有施加维持脉冲的电极、并改变浮置电极的电压到较低电压的过程,可连续执行维持放电。
因此,通过浮置第一电极,并然后保持该第一电极为低电压电平,同时施加维持脉冲到第二电极,来产生两次放电。由于此时产生的两次放电可能较弱,所以与现有技术相比能产生较少的点火电荷,并且在第一次放电产生的点火电荷可用于第二次放电,因此提供了较好的PDP效率。
根据本发明,用来浮置没有施加维持脉冲的电极的启动时间可以根据面板的负载而不同。
即,当因为较少单元需要导通而使得较少负载提供给面板时,因为浮置可减少相对电极的电压变化,并可产生大的第一次放电而不产生第二次放电。因此,当将维持脉冲施加给X电极时,通过在较早的阶段浮置Y电极,可以有效的减少X和Y电极之间的势差。
另一方面,当因为较多单元需要导通而使得较多负载提供给面板时,由于浮置使得相对电极的电压变化增加,并产生了弱的第一放电。因此,当将维持脉冲施加给X电极时,可期望为了防止由于负载引起的放电强度的偏差,而在预定时间过去之后浮置Y电极。
在这种情况下,通过每一子场中导通的单元占放电单元总数的比率来得到该负载。即,通过得到在每个子场中导通的单元、并通过得到导通的单元占全部放电单元的比率而得到该负载。通过得到每一帧平均信号电平,即,通过得到一帧中施加到全部放电单元上的灰度等级的平均数,而实现另一个得到负载的方法,由于它已是本领域技术人员的公知技术,下面就不对其进行进一步的详细描述。
尽管前面描述了将维持放电脉冲施加给X电极,并在Y电极被浮置后施加低电压,但对本领域技术人员来说显而易见的是通过将维持放电脉冲施加给Y电极,并浮置X电极并将其维持在低电压也可以产生两次放电,而且根据示范实施例可以产生第一强放电和第二弱放电。
根据本发明的示范实施例,因为产生第二弱放电而不是第一强放电,所以可产生较少的点火电荷。进一步来说,因为在第一放电产生的点火电荷可用于第二放电,所以功率损耗能够减少15%。
在不脱离本发明精神和范围的情况下,本领域技术人员对本发明做出各种改进和变形是显而易见的。因此,本发明意欲覆盖包括在所附权利要求及其等效的范围内的本发明的各种改进和变形。
Claims (20)
1.一种驱动显示板的方法,该显示板具有平行形成在第一基板上的第一电极和第二电极、以及与第一电极和第二电极交叉并形成在第二基板上的寻址电极,该方法包括:
在维持周期期间,
交替施加电压脉冲给第一电极和第二电极;和
浮置第一电极或者第二电极,并且维持所浮置的电极在第一电压电平,同时施加该电压脉冲给第一电极和第二电极中的另一个。
2.根据权利要求1的方法,其中在该电压脉冲的上升周期期间,浮置所浮置的电极。
3.根据权利要求1的方法,其中浮置电极的时间取决于显示板的负载。
4.根据权利要求1的方法,其中在施加该电压脉冲之前浮置电极。
5.根据权利要求1的方法,其中在施加该电压脉冲之后浮置电极。
6.根据权利要求1的方法,其中在维持放电结束后的1μs之内将第一电压电平施加给所浮置的电极。
7.根据权利要求1的方法,其中通过和电感器的谐振而将第一电压电平施加给所浮置的电极。
8.根据权利要求1的方法,其中寻址电极维持在接地电压电平。
9.一种等离子显示板(PDP),包括:
第一基板和第二基板;
平行形成在第一基板上的第一电极和第二电极;
形成在第二基板上的寻址电极;和
驱动电路,用于在寻址周期和维持放电周期期间,产生第一电极、第二电极、和寻址电极的驱动信号,
其中在维持周期期间,该驱动电路交替施加电压脉冲给第一电极和第二电极,并浮置第一电极或者第二电极且保持所浮置的电压在第一电压电平,同时施加该电压脉冲给第一电极和第二电极中的另一个。
10.根据权利要求9的PDP,其中在维持周期期间,该驱动电路维持寻址电极在第二电压电平。
11.根据权利要求9的PDP,其中浮置电极的时间取决于PDP的负载。
12.根据权利要求9的PDP,其中在施加电压脉冲之前浮置电极。
13.根据权利要求9的PDP,其中在施加电压脉冲之后浮置电极。
14.一种用于对放电单元进行维持放电的方法,该放电单元由第一电极、第二电极、以及与第一电极和第二电极交叉的寻址电极形成,该方法包括:
施加第一电压脉冲给第一电极;并且
当施加第一电压脉冲给第一电极时,浮置第二电极并然后在第二电极保持第一电压电平。
15.根据权利要求14的方法,进一步包括:
在施加第一电压脉冲给第一电极之后施加第二电压脉冲给第二电极;并且
当施加第二电压脉冲给第二电极时,浮置第一电极并然后在第一电极保持第一电压电平。
16.根据权利要求14的方法,其中在该第一电压脉冲的上升周期期间浮置该第二电极。
17.根据权利要求14的方法,其中浮置第二电极的时间量取决于导通的放电单元数量。
18.根据权利要求14的方法,其中在施加第一电压脉冲给第一电极之前浮置第二电极。
19.根据权利要求14的方法,其中在施加第一电压脉冲给第一电极之后浮置第二电极。
20.根据权利要求14的方法,其中在维持放电结束后的1μs之内将第一电压电平施加给第二电极。
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CN100418119C (zh) * | 2006-05-24 | 2008-09-10 | 乐金电子(南京)等离子有限公司 | 等离子显示装置 |
US7920103B2 (en) | 2005-09-16 | 2011-04-05 | Lg Electronics Inc. | Plasma display apparatus and driving method thereof |
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KR20030036302A (ko) * | 2003-02-26 | 2003-05-09 | 엘지전자 주식회사 | 공기조화기용 벽 매입형 실외기 |
KR100551124B1 (ko) * | 2003-12-31 | 2006-02-13 | 엘지전자 주식회사 | 플라즈마 디스플레이 패널의 구동 방법 |
KR100560481B1 (ko) * | 2004-04-29 | 2006-03-13 | 삼성에스디아이 주식회사 | 플라즈마 디스플레이 패널의 구동 방법 및 플라즈마 표시장치 |
KR100726633B1 (ko) | 2005-07-28 | 2007-06-12 | 엘지전자 주식회사 | 플라즈마 디스플레이 장치 및 그의 구동 방법 |
CN100463025C (zh) * | 2005-09-30 | 2009-02-18 | 乐金电子(南京)等离子有限公司 | 等离子显示器驱动装置 |
KR100774869B1 (ko) * | 2006-04-06 | 2007-11-08 | 엘지전자 주식회사 | 플라즈마 디스플레이 장치 |
KR100748333B1 (ko) * | 2006-11-30 | 2007-08-09 | 삼성에스디아이 주식회사 | 플라즈마 표시 패널의 구동장치 및 그 구동방법 |
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US7920103B2 (en) | 2005-09-16 | 2011-04-05 | Lg Electronics Inc. | Plasma display apparatus and driving method thereof |
CN100418119C (zh) * | 2006-05-24 | 2008-09-10 | 乐金电子(南京)等离子有限公司 | 等离子显示装置 |
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CN100354915C (zh) | 2007-12-12 |
KR20050040559A (ko) | 2005-05-03 |
US7355565B2 (en) | 2008-04-08 |
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