CN1173320C - 等离子体显示驱动方法 - Google Patents

等离子体显示驱动方法 Download PDF

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CN1173320C
CN1173320C CNB011354135A CN01135413A CN1173320C CN 1173320 C CN1173320 C CN 1173320C CN B011354135 A CNB011354135 A CN B011354135A CN 01135413 A CN01135413 A CN 01135413A CN 1173320 C CN1173320 C CN 1173320C
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electrode
action
discharge
voltage
cycle
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CN1352445A (zh
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濑户口典明
岸智胜
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Hitachi Ltd
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    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/28Control 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
    • G09G3/288Control 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
    • G09G3/291Control 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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    • G09G3/22Control 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
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    • G09G3/293Control 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 for address discharge
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    • G09G3/22Control 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
    • G09G3/28Control 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
    • G09G3/288Control 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
    • G09G3/291Control 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
    • G09G3/293Control 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 for address discharge
    • G09G3/2932Addressed by writing selected cells that are in an OFF state
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/28Control 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
    • G09G3/288Control 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
    • G09G3/291Control 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
    • G09G3/293Control 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 for address discharge
    • G09G3/2935Addressed by erasing selected cells that are in an ON state
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    • G09G3/20Control 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
    • G09G3/22Control 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
    • G09G3/28Control 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
    • G09G3/288Control 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
    • G09G3/298Control 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 using surface discharge panels
    • G09G3/299Control 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 using surface discharge panels using alternate lighting of surface-type panels
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  • General Physics & Mathematics (AREA)
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  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract

本发明公开了一个其中能成功地在一个短时间内进行寻址动作的等离子体显示驱动方法。在复位动作期间,壁电荷均匀地剩留在显示单元内,而后面的寻址动作包括选择OFF单元的选择动作,消除在选择动作期间选择的OFF单元内壁电荷的消除动作,与在ON单元内形成保持动作所需要的壁电荷的写入动作。

Description

等离子体显示驱动方法
技术领域
本发明涉及一种等离子体显示驱动方法。更详细地,本发明涉及一种缩短寻址动作时间的技术。
背景技术
等离子体显示(PD)装置由于产生自己的光而具有好的清晰度,是一种薄的且可制成具有大屏幕与高速显示的显示装置。因此,它引起了人们用以取代CRT显示器的兴趣。
图1是一个表示一台PD装置的基本结构的图。
如图1中表示,在等离子体显示屏面(PDP)10中,X电极(第一电极:保持电极)X1、X2...与Y电极(第二电极:扫描电极)Y1、Y2...相邻交替布置,而寻址电址(第三电极)A1、A2...沿垂直于X与Y电极的方向布置。在一对X电极与Y电极之间,即在X1与Y1、X2与Y2等等之间,建立一个显示行。而在一个显示行与一个寻址的交叉点形成一个显示单元(以后简称单元)。
X电极与一个X保持电路14连接并且向它们供给相同的驱动信号。Y电极分别与一个Y扫描驱动器12连接并且在后面将要描述的寻址动作期间按顺序供给扫描脉冲,否则由一个Y保持电路13供给相同的寻址信号。寻址电极与一个寻址驱动器11连接,跟寻址动作期间的扫描脉冲同步地供给选择ON单元与OFF单元的寻址信号,否则提供相同的驱动信号。一个控制电路15输出控制每个上述部分的信号。
图2是一个表示描述PD装置中驱动顺序的帧结构的图。由于等离子体显示的放电只有两种状态,即ON与OFF,因而显示的灰度由光发射的次数来表示。因此,对应于一个显示的一帧划分为如图2中表示的许多子场(subfield)。每个子场包括复位周期、寻址周期与保持放电周期(保持周期)。在复位周期内,不管此单元在以前的场(field)内是ON或OFF状态,进行一个使所有单元进入一个同类状态例如壁电荷消除或壁电荷均匀形成状态的动作。在寻址周期内,进行一个选择放电(寻址放电),以便根据显示数据确定一个单元的ON或OFF状态,并在一个ON状态单元内形成在紧接的保持周期内进行一次光发射放电所需要的壁电荷。在保持周期内,重复进行为使在寻址周期内进入ON状态的单元内发射光的放电。保持周期的长度,即光发射次数在子场与子场之间不同,显示的灰度,可通过以比率形式设定光发射次数例如1∶2∶4∶8...来表示,并根据灰度等级组合子场以发射每个单元的光。
图3是一个表示一个等离子体显示屏面的常规驱动方法例子的波形图。如图中示意表示,在复位周期内,一个大于放电起始电压,例如300V的脉冲电压Vw施加于X电极。这个脉冲的作用引起每个单元内放电,不管此单元在以前的子场内是ON或OFF状态并形成壁电荷。当此脉冲去除时,由壁电荷本身的电压再次引起放电,但由于电极之间没有电位差,放电产生的空间电荷被中和因而处于没有壁电荷的均匀状态。虽然几乎所有电荷被中和,但仍有少量离子或亚稳态原子剩留在放电空间内。可以有这种情况,这些剩留电荷被用作引导电荷以成功地引起下一步的寻址放电。通常把这称作引导效应或起动效应。在寻址周期内,扫描脉冲按顺序施加于Y电极而寻址脉冲(寻址信号)施加于显示行内的待变为ON状态的单元的寻址电极以引起放电。此放电传至X电极侧并且在X电极与Y电极之间形成壁电荷。此扫描在所有显示行范围内进行。接着,在保持周期内,保持脉冲电压Vs(约170V)重复施加于X电极与Y电极。当施加保持脉冲时,在寻址周期内已形成壁电荷的单元由于壁电荷电压叠加在保持脉冲电压上从而使总电压超过放电起始电压而进行放电。在寻址周期内其内部未形成壁电荷的单元不放电。
等离子体显示装置的基本结构与动作描述如上,而且提出了各种改进的例子。在一个改进中,例如,在图2的帧结构中提供具有相同光发射次数的子场使活动的显示平滑。在另一个改进中,复位动作只在一帧的第一子场内进行而不在后面的子场内进行。在又一个改进中,复位动作不在所有单元内进行而只在以前的子场内已为ON状态的单元内进行。在再一个改进中,在复位动作期间遗留均匀的壁电荷因而可使用消除寻址法以选择处于OFF状态的单元进而消除寻址动作期间的壁电荷。在又再一个改进中,通过在已去除复位脉冲的X电极与Y电极之间施加一个电压,遗留下需要的电荷量,在寻址动作期间使用。再者,本申请人在日本未审查专利公开(Kokai)NO.6-314078中公开了一种其中通过把复位脉冲电压中的上升沿设计成钝角波形使电压逐渐改变,从而使同类电荷遗留在整个表面上的结构,还在日本未审查专利公开(Kokai)No.2000-75835中公开了其中把复位脉冲的上升沿与下降沿都设计成具有平缓倾斜波形的结构。此外,本申请人还在EP 0 762 373 A2中公开了称为ALIS法等离子显示装置,其中通过在各X电极与各Y电极之间即在每个Y电极与其两侧的两个X电极之间的每个缝隙内形成显示行,使显示行为双倍而不用改变X电极与Y电极的数目。
如到此为止的说明,有各种各样对等离子体显示装置的改进,而本发明适用于它们中的每一种。
等离子体显示装置要求一个超过CRT的高质量的显示。实现高质量显示的诸因素包括高分辨率、高灰度级、高亮度、高对比度等等。为得到高的分辨率,必须通过减窄节距以增加显示行与显示单元的数目,而上述ALIS法有一个使能在低成本下得到高分辨率的结构。为得到高的对比度,必须降低由与显示无关的复位脉冲的放电的强度与减少放电的次数。
为得到高的灰度,必须增加帧内子场的数目以增加能提供的灰度级的数目,但这还要求缩短复位动作与寻址动作所需要的时间或缩短保持放电的周期。为得到高的亮度,可增加保持放电的强度,但这将导致一个使荧光材料退化的问题,而另一措施可以是增加帧内保持放电的次数。为增加保持放电的次数,必须缩短保持放电的周期或通过缩短如上述复位动作与寻址动作所需要的时间以增大保持周期的比率。然而,保持动作周期的缩短由于需要维持保持放电的稳定发生而在现行结构中有它自己的限制。因此,可采取另一措施,即通过缩短复位动作与寻址动作的需要的时间以得到较高的灰度级与较高的亮度。
本发明涉及一种缩短寻址动作需要的时间而目的在于通过增加帧内的子场数目得到较高的灰度级或通过增加保持周期的比率得到高的亮度的驱动方法。
在参照图3的描述的常规的驱动方法中,在通过复位动作得到一个没有壁电荷的均匀状态之后,对寻址电极施加寻址信号而对Y电极按顺序施加扫描脉冲,在ON单元内进行触发放电与表面放电并形成在紧接的保持动作期间发射光所需要的壁电荷。为此,一个显示行需要约2μs。对于一个有500行的屏面,一次寻址动作需要1ms时间,而对于一个有1000行的屏面,则需要2ms时间。这意味着寻址动作需要的时间占据一系列程序的大部分因而必须缩短这个时间。
发明内容
如上所述,进行提供一种状态在此状态下壁电荷在复位动作期间均匀剩留而在寻址动作期间消除OFF单元的壁电荷的消除寻址方法,而此方法由于不需要形成壁电荷因而能缩短寻址动作的时间。然而,关于此消除寻址方法,由于施加窄宽度的脉冲,出现一个运行不稳定、运行裕度很小与难以保持稳定驱动的问题。本发明的目的是实现一种使能在较短的时间内得到稳定的寻址动作的等离子体显示的驱动方法。
为实现上述目的,本发明提供一种等离子体显示驱动方法,包括一个初始化显示单元的复位动作,一个在复位动作后根据显示数据设定显示单元的寻址动作,与一个根据寻址动作期间设定的显示单元的状态选择地在一个ON单元内引起光发射的保持动作,其特征在于寻址动作有一个选择OFF单元的选择动作,一个消除在选择动作期间选择的OFF单元内的壁电荷的消除动作,与一个在ON单元内形成保持动作所需要的壁电荷的写入动作。
根据本发明的上述等离子体显示驱动方法,其中:等离子体显示器包括第一电极与相邻交替布置并沿第一方向延伸的第二电极,及沿垂直于第一方向的第二方向延伸的第三电极;通过跟施加于第二电极的扫描脉冲同步地施加于第三电极的选择OFF单元的寻址信号进行选择动作,导致第二电极与第三电极之间放电;并且选择动作在基本上转变至在第一电极与第二电极之间放电之前完成。
根据本发明的上述等离子体显示驱动方法,其中,在消除动作期间施加于第一电极与第二电极之间的电压逐渐改变。
根据本发明的上述等离子体显示驱动方法,其中:等离子体显示器包括第一电极与相邻交替布置并沿第一方向延伸的第二电极及沿垂直于第一方向的第二方向延伸的第三电极;并且在写入动作中,借助在复位动作中剩留的壁电荷至少引起一个选择放电的电压施加于第一电极与第二电极之间使发生放电并形成保持动作所需要的壁电荷。
根据本发明的上述等离子体显示驱动方法,其中:等离子体显示器包括第一电极与相邻交替布置并沿第一方向延伸的第二电极及沿垂直于第一方向的第二方向延伸的第三电极;第一显示行形成在第二电极的一侧与相邻的第一电极之间,而第二显示行形成在第二电极的另一侧与相邻的第一电极之间;一帧的显示包括其中由第一显示行建立显示的奇数场,与其中由第二显示行建立显示的偶数场;在奇数场内的写入动作中,一个具有引起写入放电的极性的电压施加于构成第一显示行的第一电极与第二电极之间,但具有引起写入放电的极性的电压不施加于构成第二显示行的第一电极与第二电极之间;以及在偶数场内的写入动作中,一个具有引起写入放电的极性的电压施加于构成第二显示行的第一电极与第二电极之间,但具有引起写入放电的极性的电压不施加于构成第一显示行的第一电极与第二电极之间。
根据本发明的上述等离子体显示驱动方法,其中,写入动作有一个周期,在此周期内一个电压施加于构成一个奇数号的第一或第二显示行的第一电极与第二电极之间,与一个周期,在此周期内一个电压施加于构成一个偶数号的第一或第二显示行的第一电极与第二电极之间。
本发明提供一种等离子体显示方法,具有如下特征:包括一个选择周期,在此周期内根据显示数据按顺序对每个显示行进行一个选择放电的选择动作;一个写入周期,在此周期内一次在每个ON单元内形成保持放电所需要的壁电荷;与一个保持周期,在此周期内在每个ON单元内重复进行保持放电。
在选择动作期间,寻址信号施加于寻址电极而扫描脉冲按顺序施加于Y电极(扫描电极)以进行OFF单元内的放电。此动作与常规的消除寻址方法相似,因为它不需要形成壁电荷,一个显示行需要的时间相对较短,且整个表面需要的时间也短。在紧接的消除动作期间,选择动作期间选择的OFF单元内的壁电荷成功地被消除。为此,例如施加一个逐渐变化的倾斜脉冲,但由于在同一时间处理整个表面因而需要的时间短。在消除动作完成时,在ON单元内复位动作后的壁电荷保持,而OFF单元内的壁电荷被消除,因此,一个脉冲施加在X电极与Y电极之间使得放电只在ON单元进行以形成为了进行后面的保持动作的需要的壁电荷。由于写入动作也可在整个表面上同时进行,因而需要的时间短。通过写入动作,在ON单元内形成保持动作所需要的壁电荷,而在OFF单元内不剩留电荷,因而能根据显示数据成功进行保持动作。
换句话说,本发明的等离子体显示驱动方法的特征在于在进行常规的消除寻址法之后,加上消除动作与写入动作以形成为了稳定地进行紧接的保持动作所需要的壁电荷。
当将本发明应用于上述ALIS法等离子体显示时,可以与正常等离子体显示相同的方法进行选择动作与消除动作,但写入动作稍有不同。在奇数场内(odd field)的写入动作期间,一个电压施加于形成此奇数场内的一个显示行的X电极(第一电极:保持电极)与Y电极(第二电极:扫描电极)之间,而不施加于形成偶数场内的一个显示行的X电极与Y电极之间。在偶数场(even field)内的写入动作期间,一个电压施加于形成此偶数场内的一个显示行的X极与Y极之间,而不施加于形成奇数场内的一个显示行的X极与Y极之间。再者,当对奇数场内的一个显示行进行这样的写入动作时,必须对邻近的奇数场内的一个显示行施加一个相反极性的电压,而如果施加一个一种极性的电压,将在每两个显示行进行写入放电。因此,在施加一个一种极性的电压之后,施加一个另一种极性的电压以进行奇数场内剩余的显示行的写入放电。当对偶数场内的显示行进行写入动作时,这一点也适用。
附图说明
通过如下参照附图的描述,本发明将被清晰地理解,这些附图中:
图1是一个表示等离子体显示装置基本结构的框图;
图2是一个表示进行等离子体显示装置中灰度显示的帧结构的图;
图3是一个表示等离子体显示装置的常规驱动方法的波形图;
图4是一个表示本发明的第一实施例中的驱动波形的图;
图5A与5B是表示第一实施例中每个电极上壁电荷变化的图;
图6是一个表示本发明的第二实施例中的驱动波形的图;
图7是一个表示本发明的第三实施例中使用的等离子体显示装置结构的框图;
图8是一个表示本发明的第三实施例中奇数场内的驱动波形的图;
图9是一个表示本发明的第三实施例中偶数场内的驱动波形的图;
图10是一个表示本发明的第四实施例中奇数场内的驱动波形的图;
图11是一个表示本发明的第四实施例中偶数场内的驱动波形的图;
图12是一个表示本发明的第五实施例中驱动顺序的帧结构的图。
具体实施方式
本发明的优选实施例描述如下。本发明的第一实施例是一个本发明应用于图1中常规的等离子体显示装置的例子。
图4是一个表示第一实施例中的驱动波形即一个子场内的驱动波形的图。图5A与5B是表示第一实施例中每个电极上电荷变化的图。参照图5A与5B,依据图4中驱动波形描述各动作如下。
如图4中表示,在复位周期内,一个高电压Vw的复位脉冲施加于Y电极。这时,一个0V电压(地电平)施加于X电极与寻址电极。通过施加复位脉冲,在所有单元内进行放电从而形成壁电荷。然后施加一个倾斜脉冲。这时壁电荷不完全中和而有相当量的壁电荷均匀地剩留,如图5A与5B中所示。在此情况下正电荷剩留在X电极上而负电荷剩留在Y电极上。
寻址周期包括选择周期、消除周期与写入周期。
在选择周期内,电压Vs施加于X电极与Y电极,而扫描脉冲按顺序施加于Y电极以便使电压降低至0V,与此同步,一个电压Va的寻址信号施加于一个OFF单元的寻址电极。在此OFF单元内,壁电荷的电压叠加在施加于Y电极与寻址电极之间的电压上面进行放电,并且正电荷积聚在Y电极上而负电荷积聚在寻址电极上。另一方面,在ON单元内,由于未施加电压而不放电,因而保持与复位动作完成时相同的壁电荷。当按顺序地所有Y电极施加扫描脉冲时进行所有上述动作,且在整个表面上的所有OFF单元内,正电荷积聚在Y电极上,而负电荷积聚在寻址电极上。在选择周期内,由于不必通过表面放电形成壁电荷,扫描脉冲与相应的寻址信号脉冲可较短,因而选择周期需要的时间同壁电荷通过表面放电形成的情况相比可明显地缩短。再者,在放电后剩留在OFF单元内的壁电荷量不需要如此精确,因为这些电荷在紧接的消除放电时被完全消除。此外,由于电压Vs施加于OFF单元的邻近Y电极的X电极,因而在放电期间正电荷移动至Y电极侧而负电荷积聚。然而,在选择周期内放电的目的是通过Y电极与寻址电极之间的放电在Y电极上形成壁电荷(在此情况下为正电荷),因此,X电极上的电荷不会引起任何问题。
在消除周期内,当对Y电极施加电压Vs时,一个其电压值从Vs逐渐下降的倾斜脉冲施加于X电极。在OFF单元内,积聚在X电极与Y电极上的壁电荷的电压叠加在倾斜脉冲上以引起放电并消除壁电荷。如在日本未审查专利公开(kokai)No.6-314078中公开的,即使积聚在X电极与Y电极上的壁电荷量变化,可通过施加倾斜脉冲使得成功进行放电,并成功消除OFF单元内的壁电荷。另一方面,在ON单元内,由于壁电荷造成的电压具有相反的极性,因而不进行放电,而保持与复位动作完成时相同的壁电荷量。如上述,当消除动作完成时,在ON单元内保留与复位动作完成时相同的壁电荷量,而在OFF单元内壁电荷被消除。在消除周期内施加钝角波形的脉冲,而这可对整个表面同时发生,因此,消除周期比选择周期短得多。
在写入周期内,电压Vs施加于X电极,0V电压施加于Y电极,而电压Va施加于寻址电极。通过这样安排,由于叠加上与复位动作完成时相同量的壁电荷造成的电压,因而在ON单元内进行放电,并形成保持周期所需要的壁电荷。另一方面,在OFF单元内由于没有壁电荷而不进行放电。由于在写入周期内对整个表面同时进行对每个电极施加脉冲,因而写入周期比选择周期短得多。
通过上述的选择与写入动作完成寻址动作。如上述,由于消除与写入周期比选择周期短得多,因而可忽略它们所需要的时间。再者,在消除周期内施加的扫描脉冲与寻址信号可以是窄宽度的脉冲因而可在比当通过表面放电形成壁电荷时较短的时间内完成。
此外,由于在消除周期内施加的扫描脉冲与寻址信号的宽度窄,在OFF单元内形成的壁电荷量变化,但因为在消除周期内施加倾斜脉冲,因而能成功进行放电,而OFF单元内的壁电荷能成功被消除。另外,在写入周期内能成功形成保持动作所需要的壁电荷,可预期得到稳定的动作。
图6是一个表示本发明的第二实施例的驱动波形的图。第二实施例也是一个将本发明应用于常规的等离子体显示装置的一个例子,同第一实施例的区别在于在复位周期内施加倾斜脉冲,这一点已公开在日本未审查专利公开(Kokai)No.2000-75835中,这个从地电平逐渐增加至电压Vs的倾斜脉冲施加于Y电极,而在消除周期内将X电极置于地电平。通过在复位周期内施加倾斜脉冲,可通过当倾斜脉冲的作用完成时X电极与Y电极之间的电压任意地调节复位周期之后的壁电荷量。
在消除周期内,虽然同第一实施例中相反,逐渐增加的倾斜脉冲施加于Y电极,但得到的结果相同,因而即使OFF单元内积聚在X电极与Y电极上的壁电荷量变化也能成功进行放电,而OFF单元内的壁电荷量能成功消除。
图7是一个表示本发明的第三实施例中使用的ALIS法等离子体显示装置结构的框图。由于ALIS法等离子体显示装置已详细公开在EP 0762 373 A2中,这里不提供详细的描述,而只描述与本发明的特征有关的那些部分。
如图7中表示,在一个ALIS法等离子体显示屏面(PDP)20内,相邻交替地布置n个Y电极(第二电极)与(n+1)个X电极(第一电极),而光从各显示线(X电极与Y电极)之间的每个缝隙发射。因此,由(2n+1)个电极形成2n个显示行。换句话说,在ALIS法情况下,显示分辨率可为显示电极数目相同的常规PD装置的两倍。再者,可较少浪费地使用放电空间,且由于被电极阻挡的光量小因而可得到高的开口比率与实现高的亮度。
奇数号X电极由一个奇数X驱动电路25驱动,而偶数号X电极由一个偶数X驱动电路26驱动。Y电极由一个Y扫描驱动器22驱动。Y扫描驱动器22包括一个移位寄存器与一个驱动电路。此驱动电路在寻址动作期间把由移位寄存器产生的扫描脉冲按顺序施加于Y电极,否则把由一个奇数Y保持电路23产生的信号施加于奇数号Y电极而把由一个偶数Y保持电路24产生的信号施加于偶数号Y电极。一个寻址驱动器21在寻址动作期间与扫描脉冲同步地把数据信号施加于寻址电极。一个控制电路27产生控制上述每个电路的信号。上述结构与常规的ALIS法PD装置中的结构相同。
图8与图9是表示第三实施例中等离子体显示装置的驱动波形的图:图8表示奇数场内的驱动波形,而图9表示偶数场内的驱动波形。在ALIS法PD装置中,各电极之间的每个缝隙用于显示放电,但这种放电不能同时进行。因此,进行所谓的交叉扫描,即由奇数行与偶数行以时间划分方式形成显示。在此ALIS方法PD装置中,显示行形成在第n个X电极与第n个电极之间的,即如图7中表示的形成在Y电极与上面的X电极之间的显示行,是一个奇数号显示行,而形成在第(n+1)个X电极与第n个电极之间的显示行,即如图7中表示的形成在Y电极与下面的X电极之间的显示行,是一个奇数号显示行。在奇数场内,由奇数号显示行建立显示,而在偶数场内,由偶数号显示行建立显示,从而得到奇数场与偶数场内的总显示。
如图8与9中表示,在复位周期内,奇数场内与偶数场内的波形相同,而在复位周期内施加的倾斜脉冲与第二实施例中相似。因此,可通过当倾斜脉冲的作用完成时在X极与Y极之间的电压任意地调节复位周期后的壁电荷量。
再者,在选择周期内奇数场内与偶数场内的波形相同,在X电极与Y电极的电压设定在一个固定值的情况下,按顺序施加负方向的扫描脉冲使Y电极的电位为地电平,并与此同步地把寻址信号施加于寻址电极。此寻址信号是一个施加于不发光的单元的正电压脉冲,而对发射光的单元不产生脉冲。这引起不发射光的单元内的Y电极与寻址电极之间的放电,并且使正电荷积聚在Y电极上,如图5B中所示。同样,在第三实施例中的选择周期内,不需要表面放电以形成壁电荷,因此,扫描脉冲与相应的脉冲可以是窄脉冲因而选择周期所需要的时间短。此外,OFF单元内剩留的壁电荷量不必如此精确,因为这些电荷被紧接的消除放电完全消除。奇数场内与偶数场内的寻址动作相同,Y电极上与同其相邻的两个X电极上壁电荷分布相同,因而在奇数号显示行与偶数号显示行之间没有差别。选择奇数号显示行或偶数号显示行视后面的写入周期内的选择而定。
在消除周期内,与第二实施例中相似,在X电极置于地电平情况下,其电压从地电平逐渐升高至Vs的倾斜脉冲施加于Y电极。这使得即使OFF单元内积聚在X电极与Y电极上的壁电荷量变化也必定能发生放电,而OFF单元内的壁电荷必定被消除。
如图8中表示,在奇数场内的写入周期内,电压Va施加在寻址电极上,且在此周期的前一半内,电压Vs施加于奇数号X电极与偶数号Y电极,而0V电压施加于偶数号X电极与奇数号Y电极,以引起奇数号X电极与奇数号Y电极之间的写入放电A。这引起ON单元内奇数号X电极与奇数号Y电极之间的放电,这是由于叠加上剩留在此单元内的具有与当复位动作完成时相同量的壁电荷的电压,从而在奇数号X电极上与奇数号Y电极上形成了保持动作所需要的壁电荷。另一方面,OFF单元内由于没有壁电荷而不发生放电。这时,在偶数号X电极与偶数号Y电极之间由于壁电荷的电压相对于施加电压有相反的极性而不发生放电。在偶数号X电极与奇数号Y电极之间和奇数号X电极与偶数号Y电极之间由于未施加电压,因而不发生放电。换句话说,在奇数场内的写入周期的前一半内,在奇数显示行中的奇数号显示行内形成紧接的保持动作所需要的壁电荷,而在奇数显示行中的偶数号显示行内与偶数显示行内不发生放电。
在奇数场内的写入周期的后一半内,电压Vs施加于偶数号X电极与奇数号Y电极,而0V电压施加于奇数号X电极与偶数号Y电极,以引起偶数号X电极与奇数号Y电极之间的写入放电B。这引起ON单元内偶数号X电极与奇数号Y电极之间的放电,这是由于叠加上剩留在此单元内的具有与当复位动作完成时相同量的壁电荷的电压,从而形成紧接的保持动作所需要的壁电荷,而OFF单元由于没有壁电荷而不发生放电。同样,偶数显示行内也不发生放电。
当上述写入周期完成时,在构成奇数显示行的奇数号X电极与奇数号Y电极上和偶数号X电极与偶数号Y电极上形成紧接的保持放电所需要的壁电荷。由于在写入周期内在整个表面上同时发生对每个电极施加脉冲,因而写入周期比选择周期短得多。如上述,选择奇数显示行或偶数显示行视写入周期内的选择而定。
接着,当彼此相反极性的保持脉冲分别施加于一对奇数号X电极与偶数号Y电极和一对偶数号X电极与奇数号Y电极时,在保持周期内,在奇数显示行内发生保持放电。
如图9中表示,偶数场内的复位周期、选择周期与消除周期内的波形与奇数场内相同。在偶数场内的写入周期的前一半内,电压Vs施加于偶数号Y电极与偶数号Y电极,而0V电压施加于奇数号X电极与奇数号Y电极,以引起偶数号X电极与奇数号Y电极之间的写入放电A。这引起在奇数显示行中的奇数号显示行内形成紧接的保持放电所需要的壁电荷,而在偶数显示行中的偶数号显示行内与奇数显示行内不发生放电。在偶数场内的写入周期的后一半内,电压Vs施加于奇数号X电极与奇数号Y电极,而0V电压施加在偶数号X电极与偶数号X电极,以引起奇数号X电极与偶数号Y电极之间的写入放电B。这引起在偶数显示行中的偶数号显示行内形成紧接的保持放电所需要的壁电荷,而在奇数显示行内不发生放电。
当上述写入周期完成时,在构成偶数显示行的偶数号X电极与奇数号Y电极内和偶数号X电极与奇数号Y电极上形成紧接的保持放电所需要的壁电荷。同样,由于在写入周期内在整个表面上同时发生对每个电极施加脉冲,因而写入周期比选择周期短得多。此后,在保持周期内发生的动作与奇数场内相同。
在第三实施例中,尽管使用了ALIS法,在复位周期、选择周期与消除周期内的动作在奇数场内与偶数场内都相同,而奇数显示行与偶数显示行之间的选择在写入周期内决定,但奇数显示行与偶数显示行之间的选择也可在选择周期内决定。本发明的第四实施例是在ALIS法等离子体显示装置中决定奇数显示行与偶数显示行之间的选择的例子。
本发明的第四实施例中的等离子体显示装置有一个与图7中相似的结构,由图10与图11中表示的驱动波形驱动。图10表示奇数场内的驱动波形,而图11表示偶数场内的驱动波形。
在第四实施例中的等离子体显示装置中,选择周期划分为前一半与后一半并决定选择。如图10中表示,在奇数场内的选择周期内,在此周期的前一半内正电压施加于X电极,0V电压施加于偶数号X电极,扫描脉冲按顺序施加于奇数号Y电极,与此同步,寻址信号施加于寻址电极。在此时,正电压施加于偶数号Y电极。然后在此周期的后一半内0V电压施加于奇数号X电极,正电压施加于偶数号X电极,扫描脉冲按顺序施加于偶数号Y电极,与此同步,寻址信号施加于寻址电极。在此时间内,正电压施加于奇数号Y电极。这引起OFF单元内Y电极上的放电与正电荷积聚。但借助X电极侧上的放电的负电荷的积紧使电荷较可能积聚在形成奇数显示行的X电极侧上,而较不可能积聚在形成偶数显示行的X电极侧面上。因此,在OFF单元内,在消除周期内消除电荷的情况下,放电变为较可能向形成奇数显示行的X电极侧发生,并且形成偶数显示行的X电极侧上的壁电荷的影响比第三实施例中的情况减小。这些形成偶数显示行的X电极是形成紧接的奇数显示行的那此,且由于在选择周期内邻近显示行的选择动作的影响减小,使写入周期内的动作更可靠地发生。
如图11中表示,在第四实施例中的偶数场内的选择周期内,在此周期的前一半内,正电荷施加于偶数号X电极,0V电压施加于奇数号X电极,扫描脉冲按顺序施加于奇数号Y电极,与此同步,寻址信号施加于寻址电极。在此周期的后一半内,0V电压施加于偶数号X电极,正电压施加于奇数号X电极,扫描脉冲按顺序施加于偶数号Y电极,与此同步,寻址信号施加于寻址电极。
图12是一个表示本发明的第五实施例中的等离子体显示装置的驱动顺序的帧结构的图。在第一至第四实施例中,构成一帧的子场如图2中所示分别有复位周期、寻址周期与保持周期。可只对每帧的第一子场提供复位周期,而在其它子场内可去除复位周期。在本发明的等离子体显示装置中,寻址周期包括选择周期、消除周期与写入周期,因此,帧有一个如图12所示的结构。在第五实施例中的驱动顺序情况下,由于伴随光发射的与显示无关的复位周期数减少,从而改善了显示对比度。
如上所述,根据本发明,可使在短时间内成功地发生寻址动作,因此,使通过延长保持周期的时间以改善显示亮度或通过增加构成一帧的子场的数目以得到高等级灰度显示成为可能。

Claims (7)

1.一种等离子体显示驱动方法,包括一个初始化显示单元的复位动作,一个在复位动作后根据显示数据设定显示单元的寻址动作,与一个根据寻址动作期间设定的显示单元的状态选择地在一个ON单元内引起光发射的保持动作,其特征在于寻址动作有一个选择OFF单元的选择动作,一个消除在选择动作期间选择的OFF单元内的壁电荷的消除动作,与一个在ON单元内形成保持动作所需要的壁电荷的写入动作。
2.如权利要求1所述的等离子体显示驱动方法,其中:等离子体显示器包括第一电极与相邻交替布置并沿第一方向延伸的第二电极,及沿垂直于第一方向的第二方向延伸的第三电极;通过跟施加于第二电极的扫描脉冲同步地施加于第三电极的选择OFF单元的寻址信号进行选择动作,导致第二电极与第三电极之间放电;并且选择动作在基本上转变至在第一电极与第二电极之间放电之前完成。
3.如权利要求2所述的等离子体显示驱动方法,其中,在消除动作期间施加于第一电极与第二电极之间的电压逐渐改变。
4.如权利要求1所述的等离子体显示驱动方法,其中:等离子体显示器包括第一电极与相邻交替布置并沿第一方向延伸的第二电极及沿垂直于第一方向的第二方向延伸的第三电极;并且在写入动作中,借助在复位动作中剩留的壁电荷至少引起一个选择放电的电压施加于第一电极与第二电极之间使发生放电并形成保持动作所需要的壁电荷。
5.如权利要求1所述的等离子体显示驱动方法,其中:等离子体显示器包括第一电极与相邻交替布置并沿第一方向延伸的第二电极及沿垂直于第一方向的第二方向延伸的第三电极;第一显示行形成在第二电极的一侧与相邻的第一电极之间,而第二显示行形成在第二电极的另一侧与相邻的第一电极之间;一帧的显示包括其中由第一显示行建立显示的奇数场,与其中由第二显示行建立显示的偶数场;在奇数场内的写入动作中,一个具有引起写入放电的极性的电压施加于构成第一显示行的第一电极与第二电极之间,但具有引起写入放电的极性的电压不施加于构成第二显示行的第一电极与第二电极之间;以及在偶数场内的写入动作中,一个具有引起写入放电的极性的电压施加于构成第二显示行的第一电极与第二电极之间,但具有引起写入放电的极性的电压不施加于构成第一显示行的第一电极与第二电极之间。
6.如权利要求5所述的等离子体显示驱动方法,其中,写入动作有一个周期,在此周期内一个电压施加于构成一个奇数号的第一或第二显示行的第一电极与第二电极之间,与一个周期,在此周期内一个电压施加于构成一个偶数号的第一或第二显示行的第一电极与第二电极之间。
7.一种等离子体显示方法,具有如下特征:包括一个选择周期,在此周期内根据显示数据按顺序对每个显示行进行一个选择放电的选择动作;一个写入周期,在此周期内一次在每个ON单元内形成保持放电所需要的壁电荷;与一个保持周期,在此周期内在每个ON单元内重复进行保持放电。
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US6784859B2 (en) 2004-08-31
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