Here's a good presentation from mid-2008 by 4D Systems, a company that makes integrated display modules <a href="http://data.4dsystems.com.au/downloads/micro-OLED/Docs/4D_AMOLED_Presentation.pdf" rel="nofollow">http://data.4dsystems.com.au/downloads/micro-OLED/Docs/4D_AM...</a> .  I don't think they manufacture the panels themselves, but they still probably have a good idea what they're talking about.  Slides 15-18 are most pertinent.<p>Basically, it looks like AMOLED uses 3x the power of an LCD for an all-white screen, and about 1/10 the power of an LCD for an almost all-black screen.  The LCD power stays the same, the AMOLED power varies by 20-30x.