LCD warmup delay?

Hi,

Just having gotten my first LCD, a Sharp Aquos, I noticed that the
quality of the picture, color saturation and brighness, seems to
change, for the better, in the first 20 minutes after the set is
turned on. Is that a common trait for LCD's?
If so, is that because the backlight needs some time to get up to
speed. Or does a initially cold LCD panel need to warm up for best
picture?

Just curious - the pix is great after the initial 'warmup' period.

-=tom=-