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Old 03-18-2009, 01:12 PM   #1
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Why flash?
What is the purpose of the flashing when digital readers change screen display? it happens on all the readers I have seen either in person or on YouTube.
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Old 03-18-2009, 01:15 PM   #2
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Quote:
Originally Posted by thibaulthalpern View Post
What is the purpose of the flashing when digital readers change screen display? it happens on all the readers I have seen either in person or on YouTube.
the flash on e-ink screens is to set the display back to zero, so to speak, and reduce "ghosting" of previous pages showing under the new page.
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Old 03-18-2009, 01:15 PM   #3
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It erases the screen so when the screen is drawn, there isn't ghosting.
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Old 03-18-2009, 03:14 PM   #4
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Good to know.
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Old 03-18-2009, 03:17 PM   #5
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It's sort of like turning over your etch-a-sketch and shaking. The eink screen just does it really fast.

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Old 03-18-2009, 03:24 PM   #6
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Quote:
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It's sort of like turning over your etch-a-sketch and shaking. The eink screen just does it really fast.
Why would you erase an Etch-a-Sketch?
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Old 03-18-2009, 10:57 PM   #7
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It erases the screen so when the screen is drawn, there isn't ghosting.
Did not know that. It's true when they say you learn something everyday.
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Old 03-19-2009, 06:12 AM   #8
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In the Cybook you can turn off the flashing, then you see why it is useful
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Old 03-19-2009, 07:35 AM   #9
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Why would you erase an Etch-a-Sketch?
heh, i would have posted that if you hadn't.
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Old 03-19-2009, 08:55 AM   #10
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I wonder if a white flash would work... It would probobly look nicer
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Old 03-19-2009, 01:15 PM   #11
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I originally thought you were asking why flash memory is used. :P Anyway, interesting about the screen flash; I was wondering that myself, but a "refresh" makes sense.
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Old 03-20-2009, 05:53 AM   #12
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Quote:
Originally Posted by CTH View Post
I wonder if a white flash would work... It would probobly look nicer
Actually what it is doing is reversing the screen, it isn't just a black flash but black and white. It is just the largest percentage of the screen is white so you mostly notice a black flash. The black text flashes white. As Jon stated this zeroes out the screen prior to drawing the next page. This is at least my understanding of it.

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Old 03-20-2009, 08:03 AM   #13
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Old 03-20-2009, 08:10 AM   #14
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Quote:
Originally Posted by thibaulthalpern View Post
What is the purpose of the flashing when digital readers change screen display? it happens on all the readers I have seen either in person or on YouTube.
That's where they hide the subliminal messages.
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Old 03-20-2009, 08:52 AM   #15
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It's probably more expensive and less accurate to specifically discharge the particles in the writings so they do a total wipe-out...
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