Originally Posted by d-range
The screen is turned off if you're on a call, so talk time battery life and screen technology are completely unrelated.
I would not say "completely unrelated", since the initial part of phone call does use the screen.
As someone else already noted, AMOLED uses less power when displaying a lot of blacks, and more power when displaying a lot of whites, very similar to plasma TV sets. Now what colors do you see more on your smartphone, whites and other bright colors, or blacks?
True about higher power consumption for whites, but, according to Wikipedia, still in general OLED offers better power efficiency. "LCDs filter the light emitted from a backlight, allowing a small fraction of light through so they cannot show true black, while an inactive OLED element does not produce light or consume power"... "While an OLED will consume around 40% of the power of an LCD displaying an image which is primarily black, for the majority of images
it will consume 6080% of the power of an LCD".
A typical Android UI does not use white as predominant tone:http://www.google.com/search?um=1&hl...i=g10&aql=&oq=
Another problem with AMOLED is that it a good AMOLED screen has a lower maximum brightness than a good LCD screen, and that AMOLED screens don't calibrate well to some kind of standard gamut.
Actually, according to Wikipedia OLED offers "Wider viewing angles & improved brightness
: OLEDs can enable a greater artificial contrast ratio (both dynamic range and static, measured in purely dark conditions) and viewing angle compared to LCDs because OLED pixels directly emit light."
Precise calibration normally only matters for professional visual design and video/image editing, but not as much for a consumer phone.