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数字电视显示技术数字电视显示技术的发展CRT显示器液晶显示器（LCD）等离子显示器（PDP）投影显示器等离子体（PDP）显示技术ABCD？日光灯的发光特性对等离子体显示器件具有重要意义什么是等离子？它是怎么发光的？等离子体是由自由流动的离子（带电的原子）和电子（带负电的粒子）组成的气体在通常情况下，气体主要由不带电的粒子组成，如果在气体中施加高电压使气体电离，这时的气体就变成了等离子体。在稳定等离子体中如果有电流穿行其中，那么带负电的粒子就会冲向那些带正电粒子的区域，而带正电的粒子也会杀向那些带负电粒子的区域双方的粒子不断地进行着撞击。这些撞击激发了等离子体中的气体原子，促使它们发出了光。这个工作原理很类似于普通日光灯等离子的发光原理等离子体显示器（PlasmaDisplayPanel）等离子显示器是一种利用气体放电的显示装置，这种屏幕采用了等离子管作为发光元件。大量的等离子管排列在一起构成屏幕。每个等离子对应的每个小室内部充有氖氙气体。在等离子管电极间加上高压后，封在两层玻璃之间的等离子管小室中的气体会产生紫外光，从而激励平板显示器上的红绿蓝三基色荧光粉发出可见光。每个离子管作为一个像素，由这些像素的明暗和颜色变化组合，产生各种灰度和色彩的图像，与显像管发光相似PDP显示器的分类•PDP分为直流（DC）驱动型和交流（AC）驱动型两种不同方式。•直流型电极与放电气体直接接触，紫外线的产生效率高，但显示屏的结构比较复杂，在目前商用彩色PDP中已很少用。•交流型的电极表面涂敷一层介质层，使其结构类似于一个电容器。交流型PDP又分对向放电和表面放电两种。•目前的主流彩色PDP为三电极表面交流放电型表面放电型ＡＣ－ＰＤＰ表面放电型AC－PDP的扫描电极Ｙ和维持电极Z（统称显示电极）位于放电介质的同一侧，使放电在前表面进行，减少了带电粒子对荧光粉的轰击。表面放电型AC－PDP的地址电极D位于放电介质和惰性气体的另一侧，显示电极的对面。在显示驱动时，首先在D和Y之间产生一个较高的电压，击穿惰性气体产生放电，然后在Y和Z之间产生一个较低的电压维持气体放电。PDP结构示意图PDP结构示意图等离子显示像素结构示意图DischargeElectrodesFrontGlassDielectric(MgO)InertGasChamberRearGlassDataElectrode等离子显示彩色像素单元结构示意图RGBAdischargearcisgeneratedwhenapotentialisdrivenacrosstheelectrodes.HowthePlasmaDisplaySub-pixelWorksCrossSectionalView~Thearcflashestheinertgastoplasmacausingittoemit(invisible)ultravioletradiation.HowthePlasmaDisplaySub-pixelWorksCrossSectionalViewTheUVradiationinturnexcitesthecolorphosphors(green,inourexample)…HowthePlasmaDisplaySub-pixelWorksCrossSectionalView…whichinturnemitapulseoflight(again,greeninthisexample,butredandblueworkthesame)...HowthePlasmaDisplaySub-pixelWorksCrossSectionalView...whichexitsthedisplaythroughthefrontglasspanelandproceedstotheviewer.HowthePlasmaDisplaySub-pixelWorksCrossSectionalView...whichexitsthedisplaythroughthefrontglasspanelandproceedstotheviewer.HowthePlasmaDisplaySub-pixelWorksCrossSectionalView...whichexitsthedisplaythroughthefrontglasspanelandproceedstotheviewer.HowthePlasmaDisplaySub-pixelWorksCrossSectionalView...whichexitsthedisplaythroughthefrontglasspanelandproceedstotheviewer.HowthePlasmaDisplaySub-pixelWorksCrossSectionalView...whichexitsthedisplaythroughthefrontglasspanelandproceedstotheviewer.HowthePlasmaDisplaySub-pixelWorksCrossSectionalView...whichexitsthedisplaythroughthefrontglasspanelandproceedstotheviewer.HowthePlasmaDisplaySub-pixelWorksCrossSectionalView...whichexitsthedisplaythroughthefrontglasspanelandproceedstotheviewer.HowthePlasmaDisplaySub-pixelWorksCrossSectionalView...whichexitsthedisplaythroughthefrontglasspanelandproceedstotheviewer.HowthePlasmaDisplaySub-pixelWorksCrossSectionalView刚才的动画除了演示出PDP等离子显示的发光过程外，大家还可以发现一个什么问题？等离子放电发出的紫外线除了轰击荧光物质外，还有部分辐射到了显示屏之外等离子显示发光过程示意图HowthePlasmaRGBPixelWorksCrossSectionalViewRGBEachsub-pixelisdriventoitsappropriatevalue.HowthePlasmaRGBPixelWorksCrossSectionalViewRGBThecorrespondingRGBlightintensityforthepixelisemittedfromthedisplay.HowthePlasmaRGBPixelWorksCrossSectionalViewRGBEyeThesecolorsblendonthewaytotheuser’seyeandareperceivedasacombinedcolor.等离子显示如何控制发光强度？LowIntensityHighIntensityR？IntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensityIntensityisControlledbyPulsingtheOutputCrossSectionalViewLowIntensityHighIntensity？PDP显示屏灰度等级的控制辉光放电的电流（对应于发光强度）不容易控制，PDP利用的是其亮与不亮的两态特性，以改变发光时间的长短来实现灰度等级的控制，所以PDP是一种数