Quote:
Originally Posted by yuliang
I am very fascinated by the E-Ink technology, and I am going to buy one when a A4 sized device is out. But I have a question from the very beginning: why all the devices existing today transits to black screen when turning pages?! Are the designers thinking it's more appealing to the eyes than transiting to a white screen? Considering the underline technology, both methods and be implemented the same way. Even more confusing is that the animations of menus and icons can be done without turn the whole screen to black or white, why don't they make the same design for turning pages. It won't increase any cost!
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It has to do with a limitation of eInk technology right now. It tends to leave residual "ghost" images behind. The multi-step screen refresh (there are various methods employed by different devices) such as "page1 -> black -> page2" or "page1 -> inverse -> page2" are done to help cleanup the screen and reduce ghosting.
When they have something that only does a partial refresh of the screen and needs to be quicker (like a menu or icon), then they skip the extra steps. This speeds it up, but can cause more ghosting. Since it's usually done this way on a smaller portion of the screen, extra ghosting isn't as noticeable. If they tried to do all the full screen refreshes this way, there would be lots of problems.