CN1571004A - 等离子体显示板中考虑寻址发光的显示灰度等级方法 - Google Patents
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Abstract
一种等离子体显示板的灰度等级的显示方法,该方法包括在时间序列上排列多个子场,每个子场具有一个亮度权重,通过子场的组合完成灰度等级显示,每个子场包括一个寻址期和一个持续期。在该灰度等级显示方法中,在较高灰度等级的子场的数量少于较低的时,确定每个子场的持续脉冲数量,使得从两相邻灰度等级之间脉冲数量差值产生的发光大于在寻址期放电的发光。该方法能够消除当寻址发光增加到与持续发光同样高时所发生的灰度等级颠倒,从而能实现正确的灰度等级显示。通过考虑寻址发光调整两相邻灰度等级之间的持续脉冲的数量差值,能随着能耗的降低实现更平定的灰度等级显示。
Description
技术领域
本发明涉及一种等离子体显示板(PDPs)中灰度等级的显示方法,尤其是,本发明涉及一种包括考虑寻址发光为每个子场确定持续脉冲数量的PDPs中的灰度等级的显示方法。
背景技术
PDP是一种具有以矩阵形式排列的多个放电单元的显示装置,这些放电单元被选择性地激发以发射光,从而将初始作为电信号输入的数据再现为图像。为提供具有彩色显示装置功能的PDP,PDP上必须显示不同的灰度等级。灰度等级显示方法是把一个电场分成多个子场并使这些子场受到时间分割的控制以通过子场实现灰度等级的显示。
每个子场主要分为一个寻址期和一个持续期。寻址期用于将每个像素的数据发送至各自的持续和寻址电极以有选择地使各个单元放电或擦除它们。持续期用于通过保持每个像素的数据显示灰度等级。
在这些方法中,PDPs灰度等级显示的最常规的方法是由日本富士通公司开发的ADS(地址显示分割)方法,这种方法是对于寻址周期进行完全分割。
此外,有关PDP灰度等级的专利在美国专利5,835,072,6,294,875B1和6,353,423B1中公开。
ADS方法包括仅仅控制持续期发光的数量以达到PDPs中的灰度等级显示。即,由持续脉冲的数量确定的子场权重是固定的,或者依据图像的负载率确定的APC(自动功率控制)水平,把每个电场分成10至12个不同的子场,以显示0至255灰度等级。
图1表述常规ADS方法中的帧结构。
如图1所示,在常规的PDP中,复位、寻址和持续周期组成一个子场,按照ADS方法几个子场组合形成一个帧。
一个子场的光是在寻址和持续放电过程中发射光的总和。典型地,灰度等级是由仅在持续期发射光的总和表示。这是由于复位或寻址发光的数量相对于持续发光的数量是可以忽略不计的。
最近,PDP技术的发展具有一个趋势,通过增加Xe分压和精度获得高亮度以减小PDP单元尺寸,由此实现真正意义上的高分辩率(HD)PDPs,同时,隔肋结构从传统的条形改变为封闭型。这反映了PDPs向高效、高亮度和高精度发展的趋势。
增加Xe分压,达得单元高精度,以及隔肋结构改变为封闭型的发展趋势导致了寻址放电过程中发射光数量的增加,所以得到的寻址发光变得很大以至于在灰度等级显示中不能忽略。
例如图2a表示常规PDP子场持续脉冲的权重和数量,图2b表示由图2a的子场权重组合显示的灰度等级的子场结构和获得的发光结构。图3是常规PDP子场发射光的图解图。
如图2a和2b所示,一个帧包括12个子场,子场权重的总和是255,持续脉冲的总数是511,在图中,符号‘A’表示复位发光和寻址发光的总和。
相应地,一个子场发射的光可通过以下等式表示:
[等式1]
子场发光=复位发光+寻址发光+持续发光
=A+持续脉冲数量
假设从一个持续脉冲发射的光是一个单元发光1。
在此子场权重之下,灰度等级1的子场结构对应于3SF,即,第三子场,而获得的发光构成是A+3。而对灰度等级6,子场结构对应于1SF,2SF和3SF,即第一,第二和第三子场,获得的发光构成是3A+15。对灰度等级7,子场结构是3SF和4SF,即第三和第四子场,合成的发光构成是2A+16。
如前所述,常规的灰度等级显示是仅取决于持续脉冲数量的子场的组合。这在由A表示的复位发光或寻址发光与持续发光相比可以忽略不计时能够达到。例如当A忽略不计时,对灰度等级6持续脉冲的数量是15,而对灰度等级7是16。此时灰度等级7比灰度等级6具有更多的持续脉冲,因而子场发光的总数越大,能更准确的显示灰度等级和获得更高的亮度。
这里,复位发光不是很重要的。但是当寻址发光等于或者大于持续发光时,灰度等级6的发光变为等于或者大于灰度等级7的发光,结果很难正确地显示灰度等级。
尤其是,在上例中,对于灰度等级6发光构成是3A+15,而对于灰度等级7发光构成是2A+16。当寻址发光等于或者大于单元持续发光时,即A=1,灰度等级6和灰度等级7之间的差值由以下的等式得到:
[等式2]
(3A+15)-(2A+16)=A-1=0
从等式2中可以看出,当寻址发光等于或大于单位持续发光时,灰度等级6的发光等于或者大于灰度等级7的,从而不能正确地显示灰度等级。
相应地,增加Xe分压、获得单元精度和把隔肋构造改为封闭型以实现高亮度的趋势导致了在寻址放电过程中发射光的数量增加,并且获得的寻址发光变得很大以至于在灰度等级显示时不能被忽略,结果就导致了不能获得正确的灰度等级显示。
发明内容
依据本发明,提供一种PDPs中灰度等级的显示方法,它考虑了寻址发光从而能够达到更平稳和准确的灰度等级显示。
本发明的一方面,提供一种等离子体显示板的灰度等级显示方法,该方法包括在时间序列上排列多个子场,每个子场具有一亮度权重,通过子场的组合完成灰度等级显示,每个子场包括一寻址期和一持续期。当较高灰度等级的子场的数量少于较低的,确定每个子场的持续脉冲的数量,使得从两相邻灰度等级之间持续脉冲数量的差值产生的光多于在寻址期放电的发光,
这里,把具有亮度权重为1的持续脉冲的数量确定为0,以使由具有亮度权重为1的子场构成的最小灰度等级的发光可以是在寻址期放电的发光。
同时,较高灰度等级的子场数量大于较低灰度等级的子场数量时,确定每个子场的持续脉冲的数量,以使两个灰度等级中较高一个的持续脉冲的数量等于较低一个的。
本发明的另一方面,提供一种等离子体显示板的灰度等级显示方法,该方法包括在时间序列上排列多个子场,每个子场具有一亮度权重,通过各个子场的组合完成灰度等级显示,每个子场包括一寻址期和一持续期。灰度等级显示方法包括确定每个子场的持续脉冲的数量,使得从两相邻灰度等级之间较高一个的发光(该发光包括组合表示较高灰度等级的子场在整个寻址期放电的发光和在整个持续期放电的发光)大于较低一个灰度等级的发光(该发光包括组合表示较低灰度等级的子场在整个寻址期放电的发光和在整个持续期放电的发光)。
附图说明
图1表示在常规ADS方法中一个帧的结构;
图2a表示在常规PDP中子场的持续脉冲的权重和数量;
图2b表示各个根据图2a中的子场权重组合显示的灰度等级的子场结构,和获得的发光构成;
图3表示在常规PDP中对于子场的发射光;
图4a表示本发明一个实施例的PDP各子场的持续脉冲的权重和数量;
图4b表示各个根据图4a中子场的权重组合显示的灰度等级的子场结构和获得的发光构成。
具体实施方式
当寻址发光增加明显达到等于或者大于持续发光时,相邻的灰度等级之间会产生灰度亮度的不正确显示。因此,希望确定一个系数,其能够使得相邻的灰度等级产生发光构成的变化,然后检测这个考虑了寻址发光的系数以保证在寻址发光增加的情况下灰度等级仍然得到正确显示。
对相邻的灰度等级,子场结构方面的变化至多是1。即,就发光构成而言该变化至多是1A。持续脉冲的数量是相同的或者随着灰度等级的增加而增加。
相应地,以下将给出在灰度等级增加到其相邻的等级时发光构成的变化系数。
对于第一系数,子场的数量是不变的,只有持续脉冲的数量改变。在这种情况下,仅有子场的数量增加,即,而对于发光构成而言A是不变的。
对于第二系数,子场的数量增加且持续脉冲的数量变化,在这种情况下,子场的数量增加1而持续脉冲的数量只增加。即,对于发光构成除第一系数之外有1A的增量。
对第三系数,子场的数量减少而持续脉冲的数量变化。在这种情况下,子场的数量减少1而持续脉冲的数量只增加。即,对于发光构成除第一系数之外有1A的增量。
在发光构成的变化系数之中,第一系数不包括的寻址发光的变化,而第二个包括寻址发光的增加。所以,不会造成不正确的灰度等级显示。
但是,第三系数,它包括了引起不正确灰度等级显示的寻址发光的增加,该系数必须考虑寻址发光。
第三系数包括寻址发光A的减少和持续脉冲数量的增加。尽管有这些变化,由于这些变化的亮度增加对于正确显示灰度等级是必要的。这可通过以下的等式表示:
[等式3]
持续脉冲数量的增量>A
从等式3中可以看出,持续脉冲的数量的增量必须大于寻址发光A,以使得具有子场数量减少的两相邻灰度等级中较高的一个具有比较低的一个更高的亮度。
符号“A”表示寻址发光(假设忽略复位发光),典型地它低于3-单元持续发光,即A<3。因此,当持续脉冲的数量的增量至少是3时,能够通过考虑寻址发光正确地显示灰度等级。
因此,当两相邻灰度等级中较高灰度等级的子场数量少于较低灰度等级时,有必要控制每个子场的权重使得较高的灰度等级的持续脉冲比较低的灰度等级至少多3个。
本领域的技术人员很容易理解,当寻址发光大于3单元持续发光时,持续脉冲的数量的增量必须相对增加。
上述的描述已经给出了作为第三系数中当两相邻灰度等级之间的亮度表示相反的情况。但是,作为第二系数的情况,当持续脉冲的数量以及子场的数量增加,灰度等级显示通过除常规方法当中的持续脉冲增加之外的、根据子场数量增加的寻址发光增加来实现,因此增加亮度变化和平稳亮度显示将很难达到。
在第二系数的情况下,当两相邻灰度等级中较高一个的子场数量大于较低一个时,随着寻址发光的增加,子场发光增加。在这种情况下,通过相对现有技术减少持续脉冲数量的增量能够实现平稳的灰度等级显示。
相应地,当两相邻灰度等级中较高一个的子场的数量大于较低一个时,控制每个子场的权重,使得从较低的灰度等级到较高的灰度等级的持续脉冲数量的增量相对于现有技术减少。在本发明的实施例中,寻址发光多达1或2-单元持续发光,而每个灰度等级的发光构成包括寻址发光和持续脉冲数量。因此,相对于现有技术,对应于灰度等级显示的必要的持续脉冲数量可以减少。
图4a表示本发明一实施例的PDP各子场的权重和持续脉冲数量,图4b表示通过图4a的子场权重组合所显示的各灰度等级的子场结构和获得的发光构成。
本发明的实施例中,如图4a和4b所示,具有权重1的第三子场的持续脉冲的数量是0,而其他子场的持续脉冲数量与现有技术相比减少2。
寻址发光具有很小的数量,例如,与1或2-单元持续发光一样高,因此,只能将其分配给灰度等级1,并且具有权重1的第三子场的持续脉冲的数量是0。这意味着,持续脉冲数量与现有技术相比减少了3。
从灰度等级6和7的实例可以看出,当两相邻灰度等级中较高一个的子场数量少于较低一个的时,持续脉冲的数量增量至少是3,
对灰度等级6和7分别为3A+8和2A+11的发光构成,寻址发光等于或大于单元持续发光,即A=1,此时,灰度等级7和6的差值可由下面等式给出:
[等式4]
(2A+11)-(3A+8)=3-A>0
从等式4中可以看出,灰度等级7比灰度等级6显现出更大的亮度,尽管寻址发光等于或大于单元持续发光,仍然能完成正确的灰度等级显示。
此外,当两相邻灰度等级(例如,灰度等级2和3,5和6,或7和8)中较高一个的子场数量大于较低一个的时,寻址发光增加1,而持续脉冲数量的增量是0。即,对两相邻的灰度等级,在一个灰度等级的子场数量大于另一个时,持续脉冲的数量是不变的。
如上所述,通过考虑寻址发光调整持续脉冲的数量能实现平稳的灰度等级显示。
而且,对于本发明实施例必要的持续脉冲数量相对于现有技术(参考图2b)降低了,由此减少了产生持续脉冲的能耗。
虽然目前已经结合应用和实施例对本发明作了描述,可以理解本发明并不局限于该公开的实施例,而相反的,覆盖了包含在附加权利要求实质和范围之内的不同的变换和等同的设置。
依据本发明,可以消除在寻址发光增加到与持续发光等高时产生的灰度等级的颠倒,能实现正确的灰度等级显示。
此外,通过考虑寻址发光调整两相邻灰度等级之间的持续脉冲的数量差值,能随着能耗的降低而实现更平稳的灰度等级显示。
Claims (6)
1.一种等离子体显示板的灰度等级的显示方法,包括:
在时间序列上排列多个子场,每个子场具有一个亮度权重,通过子场的组合完成灰度等级显示,每个子场包括一个寻址期和一个持续期;
当两相邻灰度等级中较高灰度等级的子场数量小于两相邻灰度等级中较低的时,确定每个子场的持续脉冲数量,使得从两相邻灰度等级之间持续脉冲数量差值产生的发光大于在寻址期放电产生的发光。
2.如权利要求1所述的灰度等级显示方法,其中把具有亮度权重为1的持续脉冲数量确定为0,使得包括具有亮度权重为1的子场的最小灰度等级的发光可以是寻址期放电的发光。
3.如权利要求1所述的灰度等级显示方法,其中,当两相邻灰度等级中较高一个的子场数量大于较低一个的时,确定每个子场的持续脉冲数量使得两个灰度等级中较高一个的持续脉冲数量等于较低一个的。
4.一种等离子体显示板的灰度等级的显示方法,包括:
在时间序列上排列多个子场,每个子场具有一个亮度权重,通过各个子场的组合完成灰度等级显示,每个子场包括一个寻址期和一个持续期;
确定每个子场的持续脉冲的数量,使得从两相邻灰度等级之间较高一个的发光,大于较低一个灰度等级的发光,该两相邻灰度等级中较高一个的发光包括组合在一起显示较高灰度等级的子场在整个寻址期放电的发光和在整个持续期放电的发光,该两相邻灰度等级中较低一个的发光包括组合在一起显示较低灰度等级的子场在整个寻址期放电的发光和在整个持续期放电的发光。
5.如权利要求4所述的灰度等级显示方法,其中把具有亮度权重为1的持续脉冲的数量确定为0,使得由具有亮度权重为1的子场构成的最小灰度等级的发光可以是在寻址期放电的发光。
6.如权利要求4所述的灰度等级显示方法,其中在两相邻灰度等级中较高一个的子场数量大于较低一个的时,确定每个子场的持续脉冲数量使得两个灰度等级中较高一个的持续脉冲数量等于较低一个的。
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| KR100667540B1 (ko) * | 2005-04-07 | 2007-01-12 | 엘지전자 주식회사 | 플라즈마 디스플레이 장치 및 그의 구동 방법 |
| KR100709259B1 (ko) * | 2005-09-26 | 2007-04-19 | 삼성에스디아이 주식회사 | 플라즈마 표시 장치 및 그 구동 방법 |
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| JP3259253B2 (ja) * | 1990-11-28 | 2002-02-25 | 富士通株式会社 | フラット型表示装置の階調駆動方法及び階調駆動装置 |
| JP3385757B2 (ja) | 1994-11-22 | 2003-03-10 | 松下電器産業株式会社 | 画像表示装置の駆動方法 |
| JP3463380B2 (ja) | 1994-12-06 | 2003-11-05 | 松下電器産業株式会社 | 画像表示装置 |
| JP3499058B2 (ja) * | 1995-09-13 | 2004-02-23 | 富士通株式会社 | プラズマディスプレイの駆動方法及びプラズマディスプレイ装置 |
| JPH0990901A (ja) | 1995-09-21 | 1997-04-04 | Oki Electric Ind Co Ltd | 気体放電表示パネルの駆動方法および気体放電表示パネル |
| JP3322809B2 (ja) * | 1995-10-24 | 2002-09-09 | 富士通株式会社 | ディスプレイ駆動方法及び装置 |
| JP3417246B2 (ja) * | 1996-09-25 | 2003-06-16 | 日本電気株式会社 | 階調表示方法 |
| JP3620943B2 (ja) * | 1997-01-20 | 2005-02-16 | 富士通株式会社 | 表示方法及び表示装置 |
| JP3454680B2 (ja) | 1997-08-19 | 2003-10-06 | 株式会社日立製作所 | プラズマディスプレイパネルの駆動方法 |
| TW516014B (en) * | 1999-01-22 | 2003-01-01 | Matsushita Electric Industrial Co Ltd | Driving method for AC plasma display panel |
| KR100284340B1 (ko) * | 1999-02-27 | 2001-03-02 | 김순택 | 플라즈마 표시 패널의 구동방법 |
| CN1160681C (zh) * | 1999-04-12 | 2004-08-04 | 松下电器产业株式会社 | 图象显示装置 |
| JP3482928B2 (ja) | 1999-11-15 | 2004-01-06 | 松下電器産業株式会社 | プラズマディスプレイの駆動方法 |
| JP2002132204A (ja) | 2000-10-24 | 2002-05-09 | Nec Corp | Ac型プラズマディスプレイパネルの駆動方法及びac型プラズマディスプレイ |
| US6791516B2 (en) | 2001-01-18 | 2004-09-14 | Lg Electronics Inc. | Method and apparatus for providing a gray level in a plasma display panel |
| JP4058299B2 (ja) | 2001-06-12 | 2008-03-05 | 松下電器産業株式会社 | プラズマディスプレイパネル表示装置とその駆動方法 |
| WO2002101704A1 (en) * | 2001-06-12 | 2002-12-19 | Matsushita Electric Industrial Co., Ltd. | Plasma display and its driving method |
| FR2826767B1 (fr) * | 2001-06-28 | 2003-12-12 | Thomson Licensing Sa | Procede d'affichage d'une image video sur un dispositif d'affichage numerique |
| US7503444B2 (en) * | 2005-04-26 | 2009-03-17 | Borgwarner Inc. | Shape memory alloy rotary actuator with capacitive position feedback |
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| CN100437688C (zh) | 2008-11-26 |
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| JP2004280114A (ja) | 2004-10-07 |
| US20040183755A1 (en) | 2004-09-23 |
| KR20040081941A (ko) | 2004-09-23 |
| US20080062084A1 (en) | 2008-03-13 |
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| KR100477993B1 (ko) | 2005-03-23 |
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