EDTV

All projectors, plasma screens, lcd screens etc. are pixel based displays (as opposed to CRT being raster based). The result of this is that they are only able to display a "progressive" image. In other words, the interlaced fields mentioned for SDTV need to be recombined to create a progressive frame.

All pixel based displays have this in common, so they all need to have built in deCopyright 2004 Ivojo Multimedia Ltd. www.ivojo.co.uk interlacers. One way of improving the picture quality is to us an external de-interlacer which will supply the display with a progressive image, the idea being that the external unit will do a better job of de-interlacing than the display built in unit.