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Old 09-01-2014, 05:43 PM   #3
DNSB
Bibliophagist
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Join Date: Jul 2010
Location: Vancouver
Device: Kobo Sage, Libra Colour, Lenovo M8 FHD, Paperwhite 4, Tolino epos
Quote:
Originally Posted by rayst View Post
Looking at the Aura and Aura HD at a store. On the HD, I noticed I could see a faint image of the previous page or menu after I turned a page in a book. Is this normal? The firmware was from April 2014. Kinda scares me. The plain Aura didn't have this issue.
See eInk and ghosting. The Aura uses a eInk Pearl screen with the addition of what eInk calls Regal waveform technology or low-flash waveform which plays waveshaping games with the driver voltages to reduce ghosting. While the Aura HD has the same generation Pearl technology screen, it predates the Regal technology. The Aura H2O's Carta screen will also use Regal to avoid the need for frequent full screen refresh cycles.

Though I sometimes wonder about the claims made. For instance, eInk's site claims a Pearl screen has 70%/24% (reflectance min/white max/black), the Carta data sheet says 74%/19% which doesn't really add up the their claimed 50% contrast ratio (10 for Pearl, 15 for Carta) improvement over the previous generation Pearl screen.

Regards,
David
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