Quote:
Originally Posted by jhitesma
Don't get the LCD and the eInk screens confused.
The LCD screen draws power when it's on - so the longer the LCD screen is on the more power it will draw. With the LCD time IS a factor.
With the eInk screen it's only redrawing the page that really uses power. Once the screen is drawn the eInk screen uses almost no power at all to maintain it's display. So in regards to the eInk screen the number of pages displayed is a bigger factor in power usage than how long those pages are displayed. Which means if you don't do anything that turns the LCD on it doesn't matter if you take 5 hours or 10 hours to read 166 pages - the power use will be almost identical since you're only using the eInk screen and it only uses power when redrawing the screen.
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But the screen is not the only part of the device that uses power. The nook is a computer; like any other computer the CPU, memory, etc, all use power.