Quote:
Originally Posted by DNSB
It takes the same energy to change a pixel from white to black as it does to change from black to white. And once a pixel is set, it takes no energy to maintain that state. That is the reason why eInk displays take less energy.
One other item is that the capsules contain both white and black pigment unless you have a truly antique eInk display.
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I think the first displays had a milky liquid and only black capsules, so white was a little greyer and black not quite as dark.
Indeed the image may stay indefinitely if the screen is unplugged or the battery is dead. Some readers use the last gasp of the battery to put a warning message about charging otherwise you might be baffled.