Thanks for the explanations. After switching to RGB, something happened which I have absolutely NO explanation for:
As many current displays measuring 46 inches or more, my TV set has "Dirty Screen Effect". It's caused by unevenly illumination of the panel and basically looks like vertical and horizontal banding. Here's a (very bad)
example. My screen doesn't even remotely look like that (two pillars in the upper middle with horizontal scans and several spots with vertial pans). You won't notive it at all with a more or less unmoving image. You can only see it during horizontal and vertical pans over a regular background (white fog, green gras, blue sky).
Anyway, my TV is effected as well. The effect is hardly noticable at all with normal real-live footage, but it's more pronounced with soccer-games and ESPECIALLY with anime. Contrary to real live footage, anime mostly don't have much variety in their images. The cheaper the anime is produced, the more pans and regular spaces are used.
So when watching normal footage, I hardly saw the effect (probably once every five minutes for a split second). But with normal anime, I saw it basically every time there was a pan over a regular background. Which was pretty annoying when watching some shows. And somehow, the imagery played by my PC seemed to be effected more than the imagery played by my BD-player.
But AFTER changing to RGB (from YCrCb) the problem practically disappeared. The "banding" is still there. But you can't see it anywhere as pronounced as before. Thankfully, the horizontal banding seems to be masked more than the vertical (mostly horizontal pans in anime). The RGB option masked this negative effect very effectively. And now I'd like to know WHY. As far as I know, DSE is a panel fault, so different video sources shouldn't change anything...?
Has anyone any idea what magic was at work here? ^^