This is what I am looking for.
Beware: I don't want the simple pixel-level antialiasing. I am looking for real, subpixel-rendered fonts. That means, practically, anti-aliasing under the pixel level.
I tested everything a lot, and the hard truth is, that I found real subpixel-rendering only in the cleartype algorithm in windows. Not even with osx.
Is it possible, somehow turn subpixel-rendered fonts on linux, too?