Most nincs sok időm keresgélni, így kapásból egy Samsung PDP tesztben találtam leírást erről a dologról:

"In addition to the quoted 16-bit colour depth, the PS50Q97HDX seemed to employ a fair amount of low-level dithering to minimise posterisation. Up close this may be interpreted as digital noise, but sit back far enough and you won't even notice it. It's a case of trade-off between more dithering noise and more colour banding... if you asked me I'd probably prefer to put up with the former. "

http://www.hdtvtest.co.uk/Samsung-PS50Q97HDX/Picture-Quality.php