Originally Posted by gudrun45
Here comes another one of my dumb questions:
Since I have to finish reading a regular library book first before starting to read ebooks, I decided to shut the reader off for the duration.
Okay, it asked me if I was sure, I clicked yes, and now it sits there with a white screen. Shouldn't the screen be dark????
Nope, not a dumb question at all, just a "getting to know about your new e-ink device" sort of question.
An e-ink screen requires no power to hold an image, so Sony could have just as easily picked an all black screen, or even left a 'screen saver' type image on the screen if they wanted to, but I guess they decided that this would be even more confusing, so they just reset the screen to white.
If you are wondering how this works . . .
Electrophoric type e-ink screens
use an ultra thin layer of microscopic pigment capsules in a semi-fluid medium. These micro e-ink capsules contain black and a white pigments which have been given a permanent electronic charge so that they can be moved around electronically to change pixels from light to dark, and back, dark to light.
Now, the really great thing is, once you move the little pigment particles around, THEY STAY THAT WAY.
This is one reason why "e-ink" works so well for e-reader devices, because you only need a brief pulse of electricity to change the screen, then it just holds that image until you pulse it again, which saves a LOT of power.