The power used by a screen in a laptop is becoming a major issue. As other components in laptops reduce their power, the percentage of total system power used by the screen and backlight is growing. 20-30% average is common but if you’re just reading a static page, the backlight could account for up to 50%. Come Haswell, that could jump to 70% or more in quiet-state operations. Advances in battery technology aren’t forthcoming so anything to get rid of those LED backlights is going to be worth taking a close look at. IGZO (Indium, Gallium, Zinc Oxide) technology could be one of the few answers.