Originally Posted by skyline
True, Mary Lou Jepsen says
it will save 80 per cent of the consumption with the back light off which should be enough for someone to read all day long, from dawn till dusk. Most people don't really need anything more than that, you can let it recharge while you' re asleep.
Yep, 80 percent of the display
power. And yes it may allow all-day power on something with, say, a big netbook battery. That's quite a different beast than the pathetic little batteries they cram into ebook reader devices.
Just for a quick example...if you have a netbook with a power consumption of, say, 8 watts altogether including 2.5 watts for the screen, and then stuff in a Pixel Qi display and run without the backlight, you'll be saving about 2 watts, or 25% total device power consumption. That's a pretty conservative estimate too for a netbook, IIRC.