CN1804972A - 等离子显示设备及其驱动方法 - Google Patents

等离子显示设备及其驱动方法 Download PDF

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CN1804972A
CN1804972A CNA2006100054948A CN200610005494A CN1804972A CN 1804972 A CN1804972 A CN 1804972A CN A2006100054948 A CNA2006100054948 A CN A2006100054948A CN 200610005494 A CN200610005494 A CN 200610005494A CN 1804972 A CN1804972 A CN 1804972A
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driving
voltage
plasma display
power supply
pulse
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池龙锡
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LG Electronics Inc
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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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    • G09G3/22—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
    • G09G3/28—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
    • 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
    • G09G3/298—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 using surface discharge panels

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Abstract

本发明涉及等离子显示设备及其驱动方法。根据本发明实施例，该等离子显示设备及其驱动方法将驱动脉冲施加到电极，而在电源中断时，将驱动擦除电压施加到电极。该驱动脉冲和驱动擦除电压具有相反的极性。基于本发明的实施例，可以防止在电源中断后经常出现的图像质量的极端状态，并可以实现等离子显示设备的稳定操作。

Description

等离子显示设备及其驱动方法
技术领域
本发明涉及等离子显示设备及其驱动方法。
背景技术
图1是示出常规等离子显示面板结构的视图。常规的等离子显示面板包括前面板100和后面板110。前面板100包括前玻璃基片101，后面板110包括后玻璃基片111。前面板100和后面板110平行组合在一起，其间具有预定的距离。
在前玻璃基片101上形成维持电极对，通过相互放电维持单元的发射。该维持电极对包括扫描电极102和维持电极103。扫描电极102包括第一透明电极102a和第一总线电极102b，而维持电极103包括第二透明电极103a和第二总线电极103b。该第一和第二透明电极102a和103a由透明铟锡氧化物(ITO)形成，而第一和第二总线电极102b和103b由基于金属的材料形成。扫描电极102接收扫描脉冲来扫描，和接收维持脉冲来维持放电。维持电极103主要接收维持脉冲。在维持电极对上形成上介质层104，该上介质层104限制放电电流并使扫描电极102和维持电极103彼此绝缘。保护层105被形成在上介质层104上，其由氧化镁(MgO)形成，来使其易于满足放电条件。
在后玻璃基片111上形成寻址电极113，使得该寻址电极113与维持电极对交叉。下介质层115形成在寻址电极113上，并使寻址电极113彼此绝缘。在下介质层115上形成阻挡条112，来分隔放电单元。荧光体114覆盖在阻挡条之间，并发射可见光。
利用密封材料将前玻璃基片101和后玻璃基片111密封在一起。在完成抽空处理之后，将诸如氦(He)、氖(Ne)或氙(Xe)的惰性气体注入在等离子显示面板中。
常规的等离子显示面板接收来自驱动装置的驱动脉冲和各种控制信号。等离子显示设备包括等离子显示面板和驱动装置。
图2是常规等离子显示面板的驱动波形。常规等离子显示面板具有被划分成包括复位周期、寻址周期、维持周期的三部分的驱动周期和擦除周期。
将复位周期划分为建立周期和撤除周期。在建立周期期间，将上升ramp-up脉冲同时施加到扫描电极。该上升ramp-up脉冲导致放电单元内的无光放电。由于无光放电，将正极性的壁电荷积累在寻址电极和维持电极上，而负极性的壁电荷积累在扫描电极上。
在撤除周期期间，下降ramp-down脉冲擦除在扫描电极上过量产生的壁电荷，该下降ramp-down脉冲下降到地电平电压(GND)之下的确定的电压电平。撤除放电使得壁电荷均匀地剩余在放电单元内。
在寻址周期期间，将负极性的扫描脉冲Scan顺序施加到扫描电极，同时将正极性的寻址脉冲Va施加到寻址电极。由于扫描脉冲和寻址脉冲之间的电压差与在复位周期产生的壁电荷叠加在一起，而产生寻址放电。通过降低维持电极和扫描电极之间的电压差，将正极性的电压Vz施加到维持电极，来防止扫描电极产生错误放电。
在维持周期期间，将维持脉冲sus交替地施加到扫描电极和维持电极。结果，在由寻址放电选择的放电单元产生维持放电。维持脉冲sus的峰值电压电平是维持电压Vs。
在维持放电完成之后，在擦除放电期间，将倾斜波形Ramp-ers的电压提供到维持电极，来擦除在放电单元内剩余的壁电荷。
而且即使电源被中断，常规等离子显示设备仍工作，继续施加驱动脉冲。
图3是在提供到常规等离子显示面板的电源被中断之后继续施加的驱动脉冲的波形。如图所示，即使在交流(AC)电源被中断之后，仍继续地并且不稳定地将维持脉冲施加到扫描电极Y。在中断AC电源之后，仍在持续地施加不稳定的维持脉冲，其峰值电压是小于维持电压Vs的电压V1。尽管图3仅示出施加到扫描电极Y的维持脉冲，但施加到维持电极和寻址电极的驱动脉冲也继续地并不稳定地施加着。
当AC电源被中断时，在AC电源被中断后仍继续地和不稳定地施加到扫描电极Y的维持脉冲以及剩余的壁电荷会引起图像质量的极端状态(excessive state)。换句话说，由于施加到驱动设备的逻辑信号，该信号施加维持脉冲但又不具有维持电源Vs的足够电平，因而图像质量会恶化。
此外，当开始提供AC电源时，由于驱动装置的错误操作，可能会损坏驱动装置或电源电压电路。
发明内容
因此，本发明的目的是至少解决背景技术的问题和缺点。
本发明的目的之一是提供一种等离子显示设备及其驱动方法，其能够防止电源被中断时图像质量的极端状态。
本发明的另一目的是提供一种等离子显示设备及其驱动方法，其能够防止驱动装置或电源电压电路的损坏。
本发明的又一目的是提供一种等离子显示设备及其驱动方法，其能够稳定地操作。
根据本发明的第一实施例，一种等离子显示设备包括电源中断检测单元、控制器、电极驱动器和等离子显示面板。该电源中断检测单元检测电源是否被中断，并且之后输出检测信号。该控制器用于根据该检测信号输出控制信号。电极驱动器根据控制信号提供极性与驱动脉冲的极性相反的驱动擦除电压。该等离子显示面板包括电极，并通过电极对其施加驱动擦除电压。
根据本发明第二实施例，一种包括电极的等离子显示设备的驱动方法，其包括：确定电源是否被中断；当电源被中断时，输出检测信号；根据检测信号输出控制信号，并根据该控制信号施加去除驱动脉冲的驱动擦除电压。
根据本发明的关于等离子显示面板及其驱动方法的示范实施例，施加的驱动擦除电压能够防止在电源被中断之后，出现图像质量的极端状态。
根据本发明的关于等离子显示面板及其驱动方法的示范实施例，施加的驱动擦除电压能够防止驱动装置和电源电路被损坏。
根据本发明的关于等离子显示面板及其驱动方法的示范实施例，施加的驱动擦除电压能够提供等离子显示设备的稳定操作。
附图说明
下面将参考附图详细说明本发明，在附图中相同的附图标记表示相同的部分。
图1是示出常规等离子显示面板结构的视图；
图2是常规等离子显示面板的波形图；
图3是在提供到常规等离子显示面板的电源被中断后仍继续施加的驱动脉冲的波形图；
图4是示出根据本发明实施例的等离子显示设备的框图；
图5是示出根据本发明实施例的电源中断检测单元的视图；
图6a和6b是示出在电源中断之前和之后的维持脉冲的波形的图；
图7是示出根据本发明实施例的电源中断检测单元的图；
图8是示出根据本发明实施例的等离子显示设备的驱动方法的流程图；
图9a是在维持周期期间电源中断时，根据本发明实施例的等离子显示设备的驱动波形图；和
图9b是在复位周期或寻址周期期间电源中断时，根据本发明实施例的等离子显示设备操作的驱动波形图。
具体实施方式
下面将参考附图以更加详细的方式说明本发明的实施例。
根据本发明实施例的等离子显示设备包括电源中断检测单元、控制器、逻辑信号单元、电极驱动器和等离子显示面板。电源中断检测单元检测电源是否中断，并且之后输出检测信号。控制器用于根据检测信号输出控制信号。电极驱动器根据该控制信号提供极性与驱动脉冲的极性相反的驱动擦除电压。该等离子显示面板包括电极，并通过该电极对其施加有驱动擦除电压。
该等离子显示设备进一步包括逻辑信号单元，用于根据控制信号输出用于使电极驱动器输出驱动擦除电压的逻辑信号。
该驱动脉冲可以是维持脉冲。
该驱动擦除电压的电压电平可以与在寻址周期期间施加到电极的扫描脉冲的电压电平基本相同。
该驱动擦除电压可以具有负极性。
该电源中断检测单元可以在电源中断之后大约40ms内检测该电源中断。
该电源中断检测单元包括第一主电源级、变压器、次级电源级和电源检测单元。主电源级将电源转换成第一直流(DC)电源。变压器将该第一DC电源转换成第二DC电源。次级电源级将第二DC电源转换成驱动电压。当电源中断时，该电源检测单元输出该检测信号。
电源检测单元包括光电耦合器(photo-coupler)，并且当电源中断时，该光电耦合器可以输出逻辑低电平的检测信号。
该电源中断检测单元可以进一步包括分压单元(voltage dividingunit)和转换器(converter)。分压单元将维持脉冲的峰值电压分压，而转换器将分压单元输出的电压转换成DC电压，并输出该检测信号。
根据本发明实施例的等离子显示设备的驱动方法包括：确定电源是否中断；当电源中断时输出检测信号；根据该检测信号输出控制信号，并根据该控制信号施加去除驱动脉冲的驱动擦除电压。
该驱动方法进一步包括根据控制信号输出用于使驱动擦除电压输出的逻辑信号。
该驱动擦除电压可以具有与驱动脉冲极性相反的极性。
该驱动脉冲可以是维持脉冲。
该驱动擦除电压的电压电平可以与在寻址周期期间施加到扫描电极的扫描脉冲的电压电平基本相同。
该驱动擦除电压可以具有负极性。
在电源中断之后，可以在大约40ms内输出检测信号。
可以利用电源中电压电平的变化来检测电源是否被中断。
可以利用驱动脉冲中的电压电平的变化来检测电源是否中断。
驱动擦除电压的电压电平可以与在寻址周期期间施加到电极的扫描脉冲的电压电平基本相同。
下面，将参考附图详细说明本发明的上述实施例。
图4是示出根据本发明的具体实施例的等离子显示设备的框图。如图所示，该等离子显示设备包括电源中断检测单元410、控制器420、逻辑信号单元430、电极驱动器440和等离子显示面板450。
电源中断检测单元410检测到等离子显示面板450的供电是否中断，并输出检测信号。
控制器420根据从电源中断检测单元410输出的检测信号来输出用于控制逻辑信息的控制信号。
逻辑信号单元430根据从控制器420输出的控制信号来输出逻辑信号。
电极驱动器440根据从逻辑信号单元430输出的逻辑信号，施加去除驱动脉冲的驱动擦除电压。该驱动擦除电压具有与驱动脉冲的极性相反的极性。在本实施例中，驱动脉冲是维持维持放电的维持脉冲，而驱动擦除脉冲是极性与维持脉冲的极性相反的维持状态擦除电压。
等离子显示面板450包括电极，并通过该电极将来自电极驱动器440的维持状态擦除电压提供给等离子显示面板450。
通过电极驱动器440施加的驱动擦除电压将由驱动脉冲所产生的剩余的壁电荷擦除。通过驱动擦除电压擦除剩余的壁电荷有助于在电源中断之后等离子显示设备的稳定。其结果是，可以减少图像质量的极端状态和驱动装置的损坏。
图5是示出根据本发明的具体实施例的一个示例的电源中断检测单元的图。如图所示，电源中断检测单元410的主电源级411将从外部提供的AC电源转换成第一DC电源。电源中断检测单元410的变压器413将该第一DC电源转换成确定电平的第二DC电源。次级电源级415将该第二DC电源转换成驱动如图4中所示的等离子显示面板450所必须的电压。电源检测单元417检测AC电源是否中断，并且当电源检测单元417检测到AC电源中断时，电源检测单元417将检测信号输出到如图4中所示的控制单元420。电源检测单元417包括光电耦合器。该光电耦合器将次级电源级415的输出提供到控制器420。具体地，在提供AC电源时，通过电阻器R1使次级电源级415的输出下降。当AC电源中断时，电源检测单元417的光电耦合器输出逻辑低电平的检测信号。
图6a和6b是示出在电源中断之前和之后维持脉冲波形的变化的图。如图6a所示，当提供电源时，从维持电压Vs到地电平电压GND的波形是渐变的。在电源中断之后，如图3所示，不稳定的维持脉冲被施加到电极。如图6b所示，不稳定的维持脉冲被继续施加，该维持脉冲的峰值电压具有小于维持电压Vs的电压V1。从该维持脉冲的峰值电压V1到地电平电压GND自发地产生电压下降。
图7是示出根据本发明具体实施例的另一示范电源中断检测单元的图。另一示范电源中断检测单元通过检测如图6b中所示的不稳定维持脉冲的自发电压变化来检测电源的中断。该另一示范电源中断检测单元包括分压单元710和转换器720。
分压单元710包括第一到第三电阻器R1、R2和R3，以对维持脉冲的峰值电压Vs或V1进行分压。如图7中所示，可以将该第一到第三电阻器R1、R2和R3串联。其中第一到第三电阻器R1、R2和R3串联的分压单元710的输出电压V0是施加到第三电阻器R3的电压。
转换器720将分压单元710的输出电压V0转换成DC电压，并输出检测信号到如图4中所示的控制器420。
具体地，当由于电源中断，开始施加不稳定的维持脉冲时，分压单元710的输出电压V0自发地变化。然后，转换器720将检测信号输出到图4中所示的控制器420。转换器720在小于大约10ms的每一周期内检查输出电压V0的变化。
当电源中断时，图5和7中所示的上述电源中断检测单元可以在大约40ms内检测电源的中断。
下面将参考图4和8，详细说明该等离子显示设备的驱动方法。
图8是示出根据本发明的具体实施例的等离子显示设备的驱动方法的流程图。
在操作S810中，电源中断检测单元410确定对等离子显示面板450的供电是否中断。电源中断检测单元410可以直接检测从外部提供的AC电源的变化，或可以基于维持脉冲的变化来检测AC电源的变化。
当电源中断检测单元410确认电源的中断时，在操作S820中，该电源中断检测单元410输出检测信号到控制器420。
在操作S830中，控制器420根据从电源中断检测单元410输出的检测信号，将用于控制逻辑信号的控制信号输出到逻辑信号单元430。
在操作S840中，逻辑控制器430根据从控制器420输出的控制信号，将逻辑信号输出到电极驱动器440。
在操作S850中，电极驱动器440根据从逻辑信号单元430输出的逻辑信号，施加驱动擦除电压，该驱动擦除电压激发驱动脉冲的擦除。该驱动擦除脉冲具有的极性与驱动脉冲的极性相反。
图9a是当维持周期中电源中断时，根据具体实施的驱动方法工作的等离子显示设备的驱动波形图。图9b是当在复位周期中或在寻址周期中电源中断时，根据具体实施的驱动方法工作的等离子显示设备的驱动波形图。
如图9a中所示，当在维持周期中电源中断时，根据关于该等离子显示设备的驱动方法的示范实施例，将驱动擦除电压施加到电极。由于维持脉冲(其是驱动脉冲)具有正的极性，驱动擦除电压具有负的极性，由于将负极性的驱动擦除电压施加到电极，从而去除了在电源中断后出现的不稳定维持脉冲。
如图9b所示，当在复位周期中或在寻址周期中电源中断时，根据关于该等离子显示设备的驱动方法的示范实施例，将驱动擦除电压施加到电极。
由于将负极性的驱动擦除电压施加到电极，可以去除不稳定的维持脉冲，并且该不稳定的维持脉冲的去除可以进一步擦除剩余的壁电荷。结果，可以阻止驱动装置或电源电路的损坏，并可以稳定地操作该等离子显示设备。
如图9a和9b中所示，当施加到如图4中所示的电极驱动器440的驱动擦除电压的电压电平，与在寻址周期施加到扫描电极的扫描脉冲的电压电平基本相同时，可以实现结构简单的电极驱动器440。
显然，如上说明的本发明可以以多种方式改变。这些改变不认为时脱离了本发明的精神和范围，并且所有这些对本领域技术人员而言显而易见的修改被包括在所附权利要求的范围内。

Claims (19)

1.一种等离子显示设备，包括：
电源中断检测单元，用于检测电源是否中断，并且之后输出控制信号；
控制器，用于根据该检测信号输出控制信号；
电极驱动器，用于根据该控制信号提供驱动擦除电压，该驱动擦除电压具有与驱动脉冲的极性相反的极性；和
等离子显示面板，其包括电极，并通过该电极对其施加驱动擦除电压。
2.如权利要求1所述的等离子显示设备，其中该等离子显示设备进一步包括逻辑信号单元，用于根据控制信号输出使电极驱动器输出驱动擦除电压的逻辑信号。
3.如权利要求1所述的等离子显示设备，其中该驱动脉冲是维持脉冲。
4.如权利要求1所述的等离子显示设备，其中该驱动擦除电压的电压电平与在寻址周期期间施加到电极的扫描脉冲的电压电平基本相同。
5.如权利要求1所述的等离子显示设备，其中该驱动擦除电压具有负极性。
6.如权利要求1所述的等离子显示设备，其中该电源中断检测单元在电源中断之后大约40ms内检测电源的中断。
7.如权利要求1所述的等离子显示设备，其中该电源中断检测单元包括：
主电源级，用于将电源转换成第一直流(DC)电源；
变压器，用于将该第一DC电源转换成第二DC电源；
次级电源级，用于将第二DC电源转换成驱动电压；和
电源检测单元，用于当电源中断时，输出检测信号。
8.如权利要求7所述的等离子显示设备，其中该电源检测单元包括光电耦合器，用于当电源中断时，输出逻辑低电平的检测信号。
9.如权利要求1所述的等离子显示设备，其中该电源中断检测单元包括：
分压单元，用于对维持脉冲的峰值电压进行分压；和
转换器，用于将分压单元的输出电压转换成DC电压，并然后用于输出该检测信号。
10.一种包括电极的等离子显示设备的驱动方法，该驱动方法包括：
确定电源是否中断；
当电源中断时，输出检测信号；
根据该检测信号输出控制信号；和
根据该控制信号施加去除驱动脉冲的驱动擦除电压。
11.如权利要求10所述的驱动方法，其中该驱动进一步包括根据该控制信号输出用于使驱动擦除电压输出的逻辑信号。
12.如权利要求10所述的驱动方法，其中施加驱动擦除电压包括施加其极性与驱动脉冲极性相反的驱动擦除电压。
13.如权利要求10所述的驱动方法，其中在施加驱动擦除电压的步骤中，该驱动脉冲是维持脉冲。
14.如权利要求10所述的驱动方法，其中该驱动擦除电压的电压电平与在寻址周期施加到扫描电极的扫描脉冲的电压电平基本相同。
15.如权利要求10所述的驱动方法，其中施加驱动擦除电压包括施加具有负极性的驱动擦除电压。
16.如权利要求10所述的驱动方法，其中该检测信号的输出包括在电源中断后大约40ms内输出该检测信号。
17.如权利要求10所述的驱动方法，其中确定电源是否中断的步骤包括检测电源中电压电平的变化。
18.如权利要求10所述的驱动方法，其中确定电源是否中断包括检测驱动脉冲中电压电平的变化。
19.如权利要求10所述的驱动方法，其中该驱动擦除电压的电压电平与在寻址周期期间施加到电极的扫描脉冲的电压电平基本相同。
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EP1681667A3 (en) 2009-01-14

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