Did some checking and here is some info on the screens:
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AM OLED, but what is it and what does it mean for you?
OLED, also known as LEP (light emitting polymer), is a screen made up of small dots of organic polymers that, when charged with electricity, emit light. The advantage of OLED displays are that they are generally brighter, have a better colour gamut (numbers of colours that can be accurately displayed at same time), have better contrast ratio, have a better response time, have better viewing angles and use less power. In contrast to traditional TFT LCD displays they do not require a back light.
AM OLED is a technology that combines the active matrix back plane, from a traditional TFT screen, with an OLED display. AM OLED displays, because of their active matrix nature, are quicker to switch pixels and thus give better performance for fast moving, on-screen changes such as animation and video.
What this means is:
- Reduced power consumption. In normal uses cases AM OLED requires 30-40% less power than a LCD screen. The power used is related to what is shown on the screen - the darker the screen the less power is used, conversely a predominantly white screen will use more power.
- A better contrast ratio (ratio of the luminance of the brightest color, white, to that of the darkest color, black). Roughly 1:1300 compared to 1:500. Black is truly black on an AM OLED screen as there is no back-light and therefore no 'light-leakage'.
- A better viewing angle - around 180