Bill Crawford <[email protected]> writes: > On Wednesday 11 March 2009 08:11:43 Tino Keitel wrote: > >> As LCDs usually like vertical refresh rates of 60 Hz, you also >> shouldn't use a 75 Hz mode. > > Most LCDs seem to be capable of 75, and I (alone?) can see the difference, at > least on my Hanns·G monitors at work.
Assuming that your lcd has a stable backlight and the displayed image does not change, the signal refresh rate should not make any difference at all. If the backlight is flickering on the signal refresh rate, there's a fair chance that many people will be able to tell the difference between 60 Hz and 75 Hz. On the other hand, if the backlight is flickering at twice the signal refresh rate or more, it should be quite hard to notice for most people. Using a changing image, it should be possible to design a "movie" that many people with perceive as smoother at 75 Hz than 60 Hz, where the effect is completely unrelated to sampling artifacts. (Using sampling artifacts, it is also possible to make 60 Hz seem smoother than 75 Hz, which is why I specifically mention that). However, this depends on the panel refresh rate being synchronized with the signal refresh rate. My old lcd monitor (which is now my secondary monitor) would drop ca 1 frame per second when the signal refresh rate was ~60 Hz. So I'm suspecting that the panel refresh rate was decoupled from the signal refresh rate on that particular monitor. I don't know how common that is, though. (And admittedly, I haven't tried varying the signal refresh rate to see what happens.) eirik _______________________________________________ xorg mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/xorg
