CRTs can show sharp motion with no brightness sacrifice and can therefore look much better when playing back video. Modern screens either use some form of “motion smoothing”, which leads to the dreaded “soap opera effect” or they insert black frames between the regular ones which causes brightness reduction. Sample and hold is not the only cause of unwanted motion blur on LCDs, but it’s a big one.
While the sample and hold method might sound superior, the perceptual effect is a blurry image in motion thanks to the way we perceive apparent motion. The frame is drawn on screen, but immediately begins to fade to black as the phosphors lose energy. CRTs (and plasma screens) use a pulsed method. LCD flat panels use a display method known as “sample and hold”, where the current frame stays on screen in a perfectly static way until the next one is ready. With almost no visual hit compared to doing the same thing on an LCD. Using a CRT for high-end 3D applications means you can cut the resolution, keep the eye candy and get good performance. With the advent of LCD technology you pretty much had to output at the native resolution, which meant cutting corners in other areas such as texture and lighting detail. Simply lower the resolution to get a smoother experience. In the past this was a good way to gain performance in 3D apps and video games.
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