CN100501817C - 用于驱动等离子体显示板的设备和方法 - Google Patents

用于驱动等离子体显示板的设备和方法 Download PDF

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CN100501817C
CN100501817C CNB2004800214096A CN200480021409A CN100501817C CN 100501817 C CN100501817 C CN 100501817C CN B2004800214096 A CNB2004800214096 A CN B2004800214096A CN 200480021409 A CN200480021409 A CN 200480021409A CN 100501817 C CN100501817 C CN 100501817C
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李在璨
具本哲
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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
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    • G09G3/294—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 for lighting or sustain discharge
    • G09G3/2946—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 for lighting or sustain discharge by introducing variations of the frequency of sustain pulses within a frame or non-proportional variations of the number of sustain pulses in each subfield
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Abstract

本发明公开了一种用于驱动等离子体显示板、可以降低功率消耗的设备和方法。在该设备中，子域映射单元将从其外部输入的数据映射到事先存储的子域图形。APL计算器计算对应于从外部输入的所述数据的APL，然后，产生关于与计算的APL对应的保持脉冲数量的信息。负载检测器从子域映射装置接收映射数据，以根据是否对每个子域供给数据，产生控制信号。波形发生器根据关于保持脉冲数量的所述信息和所述控制信号，控制对显示板施加的保持脉冲。

Description

用于驱动等离子体显示板的设备和方法
技术领域
本发明涉及等离子体显示板，本发明更具体地涉及用于驱动等离子体显示板、自适应降低功率消耗的设备和方法。
背景技术
通常，利用在气体放电产生的紫外线激发荧光材料时荧光材料发出的可见光，等离子体显示板(PDP)显示图像。PDP的优点是，与现有的阴极射线管(CRT)相比，它的厚度薄、重量较轻，而且它的分辨率高，可以实现大规模屏幕。
参考图1和2，传统的三电极AC表面放电PDP包括设置在上衬底10上的扫描电极Y1至Yn和保持电极Z，以及设置在下衬底18上的寻址电极X1至Xm。PDP的放电单元1设置在扫描电极Y1至Yn、保持电极Z以及寻址电极X1至Xm之间的交叉点上。
扫描电极Y1至Yn和保持电极Z分别包括透明电极12以及其线宽小于透明电极12并设置在透明电极12的一个边缘上的金属总线电极11。透明电极12通常由上衬底10上的氧化锡铟(ITO)形成。金属总线电极11通常由透明电极12上的金属形成，从而减小由具有高电阻的透明电极12产生的压降。在设置了扫描电极Y1至Yn和保持电极Z的衬底10上，布置上介质层13和保护膜14。等离子体放电时产生的壁电荷累积在上介质层13上。保护膜14防止因为等离子体放电时的溅射而影响电极Y1至Yn和Z，并且提高二次电子的发射效率。该保护膜14通常由氧化镁(MgO)构成。
在与扫描电极Y1至Yn和保持电极相交的方向，在下衬底18上形成寻址电极X1至Xm。在下衬底18上形成下介质层17和阻挡肋15。下介质层17和阻挡肋15的表面上形成荧光材料层16。阻挡肋15被形成为带形或者网格形，以物理地分割放电单元1，从而截断相邻放电单元1之间的电干扰和光干涉。在等离子体放电期间产生的紫外线激发、辐照荧光材料16，以产生红色、绿色和蓝色可见光线之任一。
将用于放电的诸如He+Xe、Ne+Xe或者He+Ne+Xe的惰性混合气体注入在上衬底10和下衬底18以及阻挡肋15之间确定的放电空间。
这种PDP对一帧实现时分驱动，可以将一帧划分为多个具有不同发光效率的子域，从而表示图像的灰度级。再将每个子域划分为：复位周期，用于均匀实现放电；寻址周期，用于选择放电单元；以及保持周期，用于根据放电频率表示灰度级。例如，在希望显示256灰度级的图像时，将等于1/60秒(即，16.67msec)的帧间隔划分为8个子域。再将8个子域分别划分为寻址周期和保持周期。在此，对于每个子域，每个子域的复位周期和寻址周期相同，而在每个子域，保持周期和放电频率以2n(其中n＝0，1，2，3，4，5，6和7)的比例升高，与保持脉冲数目成正比。如上所述，由于保持周期在每个子域不同，所以可以实现图像的灰度级。
图3示出用于PDP的驱动设备的原理图。
参考图3，用于PDP的驱动设备包括：连接在第一反伽玛调节器31A与数据校准器35之间的增益调节器32、差错扩散器33和子域映射单元34；以及连接在第二反伽玛调节器31B与波形发生器37之间的平均图像电平(APL)计算器36。
第一反伽玛调节器31A和第二反伽玛调节器31B的每一个对输入线30上的数字视频数据RGB进行反伽玛校正，以根据图像信号的灰度级值，线性变换亮度。
增益调节器32调节红色、绿色和蓝色数据每一个的有效增益，从而补偿色温。
差错扩散器33将从增益调节器32输入的数字视频数据RGB的量化误差扩散到相邻单元内，从而精细控制亮度值。
对于每位，子域映射单元34将差错扩散器33输出的数据映射到事先存储的子域图形，然后，将映射的数据施加到数据校准器35。
数据校准器35将从子域映射单元34输入的数字视频数据施加到PDP 38的数据驱动电路。该数据驱动电路连接到PDP 38的数据电极，以闩锁数据校准器35对每条水平线输出的数据，然后，在每个水平周期，将闩锁数据施加到PDP 38的数据电极。
APL计算器36计算从第二反伽玛调节器31B输入的数字视频数据RGB的每帧的平均亮度，即，平均图像电平(APL)，然后，输出关于与所计算的APL对应的保持脉冲数量的信息。
响应于APL计算器36输出的关于保持脉冲数的信息，波形发生器37产生定时控制信号，然后，将该定时控制信号施加到扫描驱动电路和保持驱动电路(未示出)。在保持周期期间，响应于波形发生器37输出的定时控制信号，扫描驱动电路和保持驱动电路将保持脉冲施加到PDP 38的扫描电极和保持电极。
在这种传统的PDP上，将利用APL计算的保持脉冲施加到放电单元1，而不考虑每个子域的负载。如果施加利用该APL确定的保持脉冲，而不考虑每个子域的负载，则产生了不必要的功率消耗。例如，当在显示板38上显示全黑时，在面板38的每个放电单元1内不产生放电。然而，该PDP的问题是，由于即使在上述情况下仍对每个子域施加保持脉冲，不必要地浪费功率。换句话说，传统PDP对其上产生保持放电的子域施加保持脉冲，因此，产生了大量功率消耗。
发明内容
根据本发明的一个方面，提供一种用于等离子体显示板的驱动设备，在该等离子体显示板上，一帧具有多个子域，所述设备包括：子域映射装置，用于将从其外部输入的数据映射到事先存储的子域图形；APL计算器，用于计算对应于从外部输入的所述数据的APL，并产生关于与所计算的APL对应的保持脉冲数量的信息；负载检测器，用于从子域映射装置接收映射的数据，以根据未对其供给所述数据的子域产生控制信号，并且根据向其提供所述数据的子域不产生控制信号；以及波形发生器，在所有子域中将与复位周期和寻址周期相对应的脉冲施加到面板，用于当从负载控制器输入所述控制信号时，响应于关于保持脉冲数量的所述信息和所述控制信号，在未对其供给所述数据的子域的保持周期期间，控制保持脉冲不被施加至扫描电极和保持电极。
根据本发明的另一个方面，提供一种用于驱动等离子体显示板的方法，在该等离子体显示板上，一帧具有多个子域，所述方法包括步骤：从多个子域中，检验不对其供给数据的特定子域；根据未对其供给所述数据的所述特定子域形成控制信号，并且根据向其提供所述数据的子域不形成控制信号；在所有子域中将与复位周期和寻址周期相对应的脉冲施加到面板；以及当从负载检测器输入所述控制信号时，在所述特定子域的保持周期期间，响应于所述控制信号，控制保持脉冲不被施加至扫描电极和保持电极。
附图说明
根据下面参看附图对本发明实施例所做的详细说明，本发明的这些以及其他目的显而易见，其中：
图1是示出传统等离子体显示板的结构的平面原理图；
图2是示出图1所示单元的结构的详细透视图；
图3是传统等离子体显示板的驱动设备的结构的框图；
图4是示出根据本发明实施例的等离子体显示板的驱动设备的结构的方框图；以及
图5和图6示出由图4所示驱动设备控制的保持脉冲。
具体实施方式
现在将详细说明本发明的优选实施例，附图示出其例子。
下面将参考图4至6详细说明本发明的优选实施例。
图4是示出根据本发明实施例的等离子体显示板的驱动设备的结构的框图。
参考图4，根据本发明实施例的PDP驱动设备包括：连接在第一反伽玛调节器41A与数据校准器45之间的增益调节器42、差错扩散器43和子域映射单元44；连接在第二反伽玛调节器41B与波形发生器48之间的平均图像电平(APL)计算器47；以及连接在子域映射单元44与波形发生器48之间的负载检测器46。
第一反伽玛调节器41A和第二反伽玛调节器41B的每一个对输入线40上的数字视频数据RGB进行反伽玛校正，以根据图像信号的灰度级值，线性变换亮度。
增益调节器52调节红色、绿色和蓝色数据的每一个的有效增益，从而补偿色温。
差错扩散器53将从增益调节器52输入的数字视频数据RGB的量化误差扩散到相邻单元内，从而精细控制亮度值。
对于每位，子域映射单元44将差错扩散器53输出的数据映射到事先存储的子域图形，并将映射的数据施加到数据校准器55。
数据校准器45将从子域映射单元44输入的数字视频数据施加到显示板49的数据驱动电路。该数据驱动电路连接到显示板49的数据电极，以闩锁数据校准器45对每条水平线输出的数据，然后在每个水平周期将闩锁数据施加到显示板49的数据电极。
对于从第二反伽玛调节器41B输入的数字视频数据RGB，APL计算器47计算每帧的平均亮度，即，平均图像电平(APL)，并输出关于与计算的APL对应的保持脉冲数量的信息。
根据由子域映射单元44映射的数据负载，负载检测器46产生控制信号，并将产生的控制信号施加到波形发生器48。实际上，负载检测器46确定是否对每个子域供给数据。如果对该子域供给数据，则负载检测器46产生控制信号，以将该控制信号施加到波形发生器48。换句话说，负载检测器46检测不对它施加数据的子域(或者不产生保持放电的子域)，并根据检测到的子域产生控制信号。
响应于APL计算器47输出的关于保持脉冲数目的信息，波形发生器48产生定时控制信号，并将该定时控制信号施加到扫描驱动电路和保持驱动电路(未示出)。在保持周期期间，响应于波形发生器57输出的定时控制信号，扫描驱动电路和保持驱动电路将保持脉冲施加到面板49的扫描电极和保持电极。
同时，波形发生器48控制扫描驱动电路和保持驱动电路，以致在从负载检测器46输入控制信号时，在子域的保持周期期间，根据该控制信号，不施加保持脉冲。换句话说，波形发生器48控制它们，以致在子域的保持周期期间，根据负载检测器46输出的控制信号，不施加保持脉冲，从而避免不必要的功率消耗。
下面将参考图5详细说明负载检测器46和波形发生器48的操作步骤。
首先，假定在将数据送到图5中的其余子域SF1至SF3和SF5至SFk时，不将数据送到第四子域SF4。
在包括在每个子域SF中的复位周期中，对扫描电极施加预定初始化脉冲，从而初始化放电单元。在寻址周期内，将对应于该数据的数据脉冲施加到寻址电极，从而选择要接通的放电单元。此外，在保持周期内，施加对应于APL的保持脉冲，以在寻址周期内使选择的放电单元放电。
负载检测器46参考对每个子域映射的数据而产生控制信号。在此，由于仅在第四子域SF4的间隔期间不供给数据，所以根据第四子域SF4的间隔，负载检测器46产生控制信号。波形发生器48控制扫描驱动电路和保持驱动电路，以在保持周期期间施加数量对应于APL的保持脉冲。此外，波形发生器48控制扫描驱动电路和保持驱动电路，以致在对应于负载检测器46输出的控制信号的子域，即，第四子域SF4的时间间隔期间，不施加保持脉冲。因此，在第四子域SF4的保持周期内，不施加保持脉冲，因此可以避免不必要的功率消耗。实际上，在本发明的实施例中，当在面板49上在一帧期间显示全黑时，在包括在所述帧内的所有子域SF的保持周期期间不施加保持脉冲，如图6所示。
尽管利用附图所示的上述实施例对本发明进行了说明，但是本技术领域内的普通技术人员应该明白，本发明并不局限于该实施例，而且在不脱离本发明实质范围的情况下，可以对其进行各种变更或者修改。因此，仅由所附权利要求及其等同确定本发明的范围。

Claims (4)

1.一种用于等离子体显示板的驱动设备，在该等离子体显示板上，一帧具有多个子域，所述设备包括：
子域映射装置，用于将从其外部输入的数据映射到事先存储的子域图形；
APL计算器，用于计算对应于从外部输入的所述数据的APL，并产生关于与所计算的APL对应的保持脉冲数量的信息；
负载检测器，用于从子域映射装置接收映射的数据，以根据未对其供给所述数据的子域产生控制信号，并且根据向其提供所述数据的子域不产生控制信号；以及
波形发生器，在所有子域中将与复位周期和寻址周期相对应的脉冲施加到面板，用于当从负载控制器输入所述控制信号时，响应于关于保持脉冲数量的所述信息和所述控制信号，在未对其施加所述数据的子域的保持周期期间，控制保持脉冲不被施加至扫描电极和保持电极。
2.根据权利要求1所述的驱动设备，其中波形发生器进行控制，以致在对应于所述控制信号的子域的保持周期期间，不施加所述保持脉冲，而在其余子域的保持周期期间，施加所述保持脉冲。
3.一种用于驱动等离子体显示板的方法，在该等离子体显示板上，一帧具有多个子域，所述方法包括步骤：
从多个子域中，检验不对其供给数据的特定子域；根据未对其供给所述数据的所述特定子域形成控制信号，并且根据向其提供所述数据的子域不形成控制信号；
在所有子域中将与复位周期和寻址周期相对应的脉冲施加到面板；以及
当从负载检测器输入所述控制信号时，在所述特定子域的保持周期期间，响应于所述控制信号，控制保持脉冲不被施加至扫描电极和保持电极。
4.根据权利要求3所述的方法，其中在特定子域之外的其余子域的保持周期期间，施加所述保持脉冲。
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