数字电视技术——显示器件ppt课件

1、数字电视显 示 技 术.数字电视显示技术的开展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.A.B.C.D？.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？它是怎样发光的？等离子体是由自在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，假设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。在稳定等离子体中假设有电流穿行其中，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展着撞击。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。

2、这个任务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Plasma Display Panel等离子显示器是一种利用气体放电的显示安装，这种屏幕采用了等离子管作为发光元件。大量的等离子管陈列在一同构成屏幕。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领会产生紫外光，从而鼓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，产生各种灰度和颜色的图像，与显像管发光类似 .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

3、线的产生效率高，但显示屏的构造比较复杂，在目前商用彩色PDP中已很少用。交流型的电极外表涂敷一层介质层，使其构造类似于一个电容器。交流型PDP又分对向放电和外表放电两种。目前的主流彩色PDP为三电极外表交流放电型 .外表放电型外表放电型ACPDP的扫描电极和维持电极Z统称显示电极位于放电介质的同一侧，使放电在前外表进展，减少了带电粒子对荧光粉的轰击。外表放电型ACPDP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构造表示图.PDP构造表示图.等离子显示

4、像素构造表示图Discharge ElectrodesFront GlassDielectric (MgO)Inert GasChamberColorSpecificSub-PixelPhosphorsRear GlassData Electrode.等离子显示彩色像素单元构造表示图RGB.A discharge arc is generated when a potential is drivenacross the electrodes.How the Plasma Display Sub-pixel Works Cross Sectional View.The arc flashes t

5、he inert gas to plasma causing it to emit(invisible) ultraviolet radiation.How the Plasma Display Sub-pixel Works Cross Sectional View.The UV radiation in turn excites the color phosphors(green, in our example)How the Plasma Display Sub-pixel Works Cross Sectional View.which in turn emit a pulse of

6、light (again, green in thisexample, but red and blue work the same).How the Plasma Display Sub-pixel Works Cross Sectional View.which exits the display through the front glass paneland proceeds to the viewer.How the Plasma Display Sub-pixel Works Cross Sectional View.which exits the display through

7、the front glass paneland proceeds to the viewer.How the Plasma Display Sub-pixel Works Cross Sectional View.which exits the display through the front glass paneland proceeds to the viewer.How the Plasma Display Sub-pixel Works Cross Sectional View.which exits the display through the front glass pane

8、land proceeds to the viewer.How the Plasma Display Sub-pixel Works Cross Sectional View.which exits the display through the front glass paneland proceeds to the viewer.How the Plasma Display Sub-pixel Works Cross Sectional View.which exits the display through the front glass paneland proceeds to the

9、 viewer.How the Plasma Display Sub-pixel Works Cross Sectional View.which exits the display through the front glass paneland proceeds to the viewer.How the Plasma Display Sub-pixel Works Cross Sectional View.which exits the display through the front glass paneland proceeds to the viewer.How the Plas

10、ma Display Sub-pixel Works Cross Sectional View. 刚刚的动画除了演示出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表示图.How the Plasma RGB Pixel Works Cross Sectional ViewRGBEach sub-pixel is driven to its appropriate value.How the Plasma RGB Pixel Works Cross Sectional ViewRGBThe c

11、orresponding RGB light intensity for the pixel isemitted from the display.How the Plasma RGB Pixel Works Cross Sectional ViewRGBEyeThese colors blend on the way to the users eye and areperceived as a combined color.等离子显示如何控制发光强度？LowIntensityHighIntensityR？.Intensity is Controlled by Pulsing the Outp

12、ut Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewL

13、owIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity

14、.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled

15、 by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output C

16、ross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIn

17、tensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Int

18、ensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity.Intensity is Controlled by

19、Pulsing the Output Cross Sectional ViewLowIntensityHighIntensity？.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，以改动发光时间的长短来实现灰度等级的控制，所以PDP是一种数字显示器件。 PDP发光时间的控制即灰度由子场驱动技术实现，每场周期被分为八个子场或更多。在常用的寻址显示分别驱动法中，每个子场又分为启动期、寻址期和维持期。启动期和寻址期在各子场中时间长短一样，期间全屏不发光，只是激活应发光的象元。维持期的长短那么各不一样，正比于其中包含的脉冲数采用二进制编码时各子场

20、内放电脉冲的比值，期间被激活的象元同时点亮。某象元的灰度等级由一帧期间加在其上的总的放电脉冲数决议，当采用子场驱动时，二进制编码一共可以获得个灰度等级 .寻址与显示分别的子场驱动技术.ACPDP驱动方式的优势ACPDP的特性使得显示电极与地址电极交叉点构成的小放电管不仅是一个可控发光元件，而且是一个可控存储单元，整屏既是发光单元的二维阵列，又是一个矩阵存储器，每个发光元件也只需发光和不发光两个形状。ACPDP实践上是一个数字器件，可以大量采用数字图象处置技术，且数字图象信号无须经过D/A变换，可直接用于驱动显示屏 .ACPDP驱动方式的优势表示图.PDP显示器的技术优势与CRT显示器相比PDP

21、显示器的体积更小、分量更轻，而且无X射线辐射。由于PDP各个发光单元的构造完全一样，因此不会出现显像管常见的图像的几何变形。PDP屏幕亮度非常均匀没有亮区的和暗区；而传统显像管的亮度-屏幕中心总是比周围亮度要高一些。PDP不会受磁场的影响，具有更好的环境顺应才干。PDP屏幕不存在聚焦的问题。因此，显像管某些区域因聚焦不良或年月已久开场散焦的问题得以处理，不会产生显像管的颜色漂移景象。外表平直使大屏幕边角处的失真和色纯度变化得到彻底改善。高亮度、大视角、全彩色和高对比度，使PDP图像更加明晰，颜色更加艳丽，效果更加理想，令传统电视叹为观止.PDP显示器的技术优势与LCD液晶显示器相比PDP显示亮

22、度高，屏幕亮度高达150LUX，因此可以在亮堂的环境之下欣赏大幅画面的视讯节目。颜色复原性好，灰度丰富，能提供格外亮丽、均匀平滑的画面。PDP视野开阔，PDP的视角高达160度，普通电视机的大于160度的地方观看画面已严重失真，而液晶显示器视角只需40度左右，更是无法与PDP的效果比较。对迅速变化的画面呼应速度快。此外，PDP平而薄的外型也使其优势更加明显.等离子显示技术的开展1954年，美国，DC驱动PDP的发表1956年，美国，冷阴极放电显示管的开发1966年，美国，存储型AC驱动PDP的发表1968年，荷兰，用DC驱动的PDP显示电视图像1969年，美国，自扫描型DC驱动PDP的开发1978年，日本，16英寸DC驱动彩色PDP电视机的试制1985年，日本，脉冲存储型DC驱动彩色PDP电视机的开发1993年，日本，21英