I'm pretty sure that's actually not the case. If so, why does my kindle switch itself 'off' after not using it for a few minutes? While the screen might take no energy to keep an image, I think it keeps other parts active to be ready to flip to the next page, and turns these off when, well, off.
It switches itself "off" to avoid unintentional page turns and other undesired user input. In addition, the mechanism you describe must still be active when "off" to listen to the power switch anyways.
Because the backlight is still on for a while. If they wanted, when they turn off the backlight, they could leave the page you were reading visible. They choose to show an "off" image, though.
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I'm pretty sure that's actually not the case. If so, why does my kindle switch itself 'off' after not using it for a few minutes? While the screen might take no energy to keep an image, I think it keeps other parts active to be ready to flip to the next page, and turns these off when, well, off.
It switches itself "off" to avoid unintentional page turns and other undesired user input. In addition, the mechanism you describe must still be active when "off" to listen to the power switch anyways.
This can be said of any soft power switch.
Because the backlight is still on for a while. If they wanted, when they turn off the backlight, they could leave the page you were reading visible. They choose to show an "off" image, though.