Aura HD Ghost image of previous page

rayst · 09-01-2014, 05:21 PM

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.

Ripplinger · 09-01-2014, 05:36 PM

They probably don't have the refresh set to every page. On some readers, ghosting is a problem between 2 pages, but I have refresh set to every 50 pages on my Glo and I never notice ghosting while reading. If there are any images though, that would probably ghost more than just text.

DNSB · 09-01-2014, 05:43 PM

Quote:

Originally Posted by rayst

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

PeterT · 09-01-2014, 06:15 PM

Also f/w from April is quite old. There have been numerous improvements made since then.

rayst · 09-02-2014, 09:14 AM

I'm new to readers, and I thought you wouldn't want a refresh every page as this slows down page turns, etc. The video review I watched comparing the Aura and Aura HD, one of the benefits of the Aura I believe was less refreshing needed.
Can someone clarify. Thank you.

indyglow · 09-02-2014, 09:30 AM

On my Aura HD I keep the page to be refreshed on every page turn so there is no ghosting and the text is rendered clean and crisp every time.

dordale · 09-02-2014, 11:51 PM

I have an Aura HD and have modified the config file so that it only refreshes every 20 pages. I haven't noticed any ghosting on it yet while reading. The Aura HD has settings for refresh between every 1 and 6 pages, but modifying the config file is simple. I don't have an Aura to compare the Aura HD to, so can't speak to the difference between the two.

09-01-2014, 05:21 PM	#1
rayst Junior Member Posts: 2 Karma: 10 Join Date: Sep 2014 Device: Kobo	Ghost image of previous page 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.

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09-01-2014, 05:36 PM	#2
Ripplinger 350 Hoarder Posts: 3,574 Karma: 8281267 Join Date: Dec 2010 Location: Midwest USA Device: Sony PRS-350, Kobo Glo & Glo HD, PW2	They probably don't have the refresh set to every page. On some readers, ghosting is a problem between 2 pages, but I have refresh set to every 50 pages on my Glo and I never notice ghosting while reading. If there are any images though, that would probably ghost more than just text.

09-01-2014, 06:15 PM	#4
PeterT Grand Sorcerer Posts: 12,168 Karma: 73448616 Join Date: Nov 2007 Location: Toronto Device: Nexus 7, Clara, Touch, Tolino EPOS	Also f/w from April is quite old. There have been numerous improvements made since then.

09-02-2014, 09:14 AM	#5
rayst Junior Member Posts: 2 Karma: 10 Join Date: Sep 2014 Device: Kobo	I'm new to readers, and I thought you wouldn't want a refresh every page as this slows down page turns, etc. The video review I watched comparing the Aura and Aura HD, one of the benefits of the Aura I believe was less refreshing needed. Can someone clarify. Thank you.

09-02-2014, 09:30 AM	#6
indyglow Connoisseur Posts: 77 Karma: 101837 Join Date: Oct 2012 Device: iPad Air, Kobo Forma, Kobo Aura HD (RIP)	On my Aura HD I keep the page to be refreshed on every page turn so there is no ghosting and the text is rendered clean and crisp every time.

09-02-2014, 11:51 PM	#7
dordale Wizard Posts: 1,731 Karma: 3472866 Join Date: Apr 2008 Device: Sony PRS-650 & 350; Kindle Voyage; Kobo Aura HD, Aura One, and Forma	I have an Aura HD and have modified the config file so that it only refreshes every 20 pages. I haven't noticed any ghosting on it yet while reading. The Aura HD has settings for refresh between every 1 and 6 pages, but modifying the config file is simple. I don't have an Aura to compare the Aura HD to, so can't speak to the difference between the two.