The 20" is TN Film (6-bit).
The viewing angles for the 24" suggest a S-PVA or S-IPS (8-bit), but I would like confirmation of this before I buy.
Personally I wouldn't by another TN Film based iMac or monitor.
Same here. Altho according to specs 20" panel is 8 - bit:
Number of Colors 16.7 M, 8bit(FRC)
[Edit] Sorry - it's 6 - bit and dithering. I can't find much information about all this "8-bit vs 8-bit-FRC" differences tho...
oh- got it:
there are different ways to make a 6-bit panel look like an 8-bit one. The most common method is FRC (frame-rate control) where a pixel is rapidly switched between two adjacent colors to produce the desired one. If implemented well, it is impossible to tell the difference between this and true 8-bit. If not implemented well, it produces artifacts like flickering on certain colors (because your brain can detect the pixels flip-flopping between states