Screen getting duller - Page 2

Cthulhu · 11-13-2006, 10:16 AM

Diablo: This was addressed in other threads, but never got a definitive answer regarding the battery life listening to mp3's.

How long did it take to drain the Reader's battery with music playing?

diabloNL · 11-13-2006, 12:40 PM

Quote:

Originally Posted by Cthulhu

Diablo: This was addressed in other threads, but never got a definitive answer regarding the battery life listening to mp3's.

How long did it take to drain the Reader's battery with music playing?

To be honest I don't know for sure how long it was because I did it in multiple times and not in one go. If I would have to give you a rough estimate it would be around 15 hours or so. The half of that there were no headphones attached. Remember that the battery gets to his full capacity after around 3-4 full cycles. This figure was with the first cycle.

Throughout this time the display showed the Mp3 player so parts of the screen were refreshed every second. I don't know how much power this cost but if you want to be on the safe side then put the Reader in the main menu when your not changing songs.

Mohit25 · 11-14-2006, 02:55 AM

I don't think its the battery - I recharged the reader fully but the screen still looks dull compared to a new screen. I'll try and recharge the battery fully and see if that helps

jakeluck · 11-23-2006, 06:19 PM

i notice that a newly refreshed page appears to have better contrast than a page that has been sitting for a while.

Alexander Turcic · 11-23-2006, 06:35 PM

Quote:

Originally Posted by jakeluck

i notice that a newly refreshed page appears to have better contrast than a page that has been sitting for a while.

This is also what the guy from ConsumerReports observed: We also noticed that a page displayed for several minutes got perceptibly darker in the white space.

jashsu · 11-24-2006, 12:26 AM

The small white and black pigment spheres inside E-ink are positively and negatively charged. In the page-turning process, an electric field is applied to the E-ink. The pigment spheres will either be drawn toward or away from the charge, which forms the image on the screen. However, when the electric field is not present (no page-turn in progress) then the pigment spheres are merely held in place by the viscosity of the suspension fluid. Furthermore, if you recall the white and black pigment spheres are oppositely charged. Thus, over time I suspect that they will eventually drift toward each other.

Take a look at the attached eink.jpg diagram.

These are cross-sections of the E-ink capsules. On the left, the capsule is being subjected to an electric field (a page change). The colored arrows represent the forces on the pigment spheres due to the electric field. Note that all the white pigment spheres (titanium dioxide, I think) are forced against the surface-side of the capsule. On the right, there is no electric field. The pigment spheres, being oppositely charged, slowly begin to migrate toward the center. This manifests as a loss in contrast.

diomark · 11-24-2006, 01:54 AM

Quote:

Originally Posted by Alexander Turcic

This is also what the guy from ConsumerReports observed: We also noticed that a page displayed for several minutes got perceptibly darker in the white space.

I definately notice this.. If I forget to turn off the reader, when I pick it back it it's much darker... one good way to test - bookmark and un-bookmark a page that you've been sitting on for a while. the area under the bookmark marker will be much whiter when you unbookmark it...
-mark

yvanleterrible · 11-24-2006, 08:57 AM

Then is it possible that this deterioration is similar to magnets loosing their magnetism over time or is the grid recharging the pigments?

jashsu · 11-24-2006, 01:20 PM

Quote:

Originally Posted by yvanleterrible

Then is it possible that this deterioration is similar to magnets loosing their magnetism over time or is the grid recharging the pigments?

The deterioration is unlike magnets losing their magnetism. Without delving too much into the science of it, magnetism is caused by the the spin of electrons in the atoms of the material. When the spins are aligned, they all contribute to create the large magnetic field. Loss of magnetism can be due to various factors as stress on the magnet, or high temperatures.

In this case, we're talking about electric charge, not magnetic field. There should be no risk of the pigment spheres losing their charge, as they are wholly individually charged. The grid does not recharge the individual pigment spheres themselves, it just resets the spheres back to the desired locations in the e-ink capsule.

ultim8fury · 11-24-2006, 02:12 PM

So it's just a question of brownian motion.

( That's possibly the only time I've used the term brownian motion since I left school.)

WilliamG · 11-24-2006, 05:31 PM

The colour differentiation between the two Readers the original poster saw may be just that. I compared a friend of mine's Reader to my Reader, and the colour of the page and "ink" is VERY diffferent between the two.

NatCh · 11-24-2006, 11:56 PM

Quote:

Originally Posted by ultim8fury

(That's possibly the only time I've used the term brownian motion since I left school.)

I've only ever used it when discussing HHG novels.

11-24-2006, 12:26 AM	#21
jashsu Connoisseur Posts: 67 Karma: 154 Join Date: Nov 2006 Device: PRS-500, PRS-600, PRS-650, Oasis 2	The small white and black pigment spheres inside E-ink are positively and negatively charged. In the page-turning process, an electric field is applied to the E-ink. The pigment spheres will either be drawn toward or away from the charge, which forms the image on the screen. However, when the electric field is not present (no page-turn in progress) then the pigment spheres are merely held in place by the viscosity of the suspension fluid. Furthermore, if you recall the white and black pigment spheres are oppositely charged. Thus, over time I suspect that they will eventually drift toward each other. Take a look at the attached eink.jpg diagram. These are cross-sections of the E-ink capsules. On the left, the capsule is being subjected to an electric field (a page change). The colored arrows represent the forces on the pigment spheres due to the electric field. Note that all the white pigment spheres (titanium dioxide, I think) are forced against the surface-side of the capsule. On the right, there is no electric field. The pigment spheres, being oppositely charged, slowly begin to migrate toward the center. This manifests as a loss in contrast. Attached Thumbnails

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11-13-2006, 10:16 AM	#16
Cthulhu Technologist Posts: 488 Karma: 585237 Join Date: Oct 2006 Location: I'm between Cities Device: SONY Reader PRS-500	Diablo: This was addressed in other threads, but never got a definitive answer regarding the battery life listening to mp3's. How long did it take to drain the Reader's battery with music playing?

11-14-2006, 02:55 AM	#18
Mohit25 Member Posts: 23 Karma: 10 Join Date: Oct 2006 Device: Sony Reader	I don't think its the battery - I recharged the reader fully but the screen still looks dull compared to a new screen. I'll try and recharge the battery fully and see if that helps

11-23-2006, 06:19 PM	#19
jakeluck Groupie Posts: 193 Karma: 3252 Join Date: Dec 2004	i notice that a newly refreshed page appears to have better contrast than a page that has been sitting for a while.

11-24-2006, 08:57 AM	#23
yvanleterrible Reborn Paper User Posts: 8,616 Karma: 15446734 Join Date: May 2006 Location: Que Nada Device: iPhone8, iPad Air	Then is it possible that this deterioration is similar to magnets loosing their magnetism over time or is the grid recharging the pigments?

11-24-2006, 02:12 PM	#25
ultim8fury Addict Posts: 219 Karma: 368 Join Date: Jan 2006 Location: UK Device: PRS500, Looking at 700	So it's just a question of brownian motion. ( That's possibly the only time I've used the term brownian motion since I left school.)

11-24-2006, 05:31 PM	#26
WilliamG Addict Posts: 307 Karma: 60998 Join Date: Sep 2006	The colour differentiation between the two Readers the original poster saw may be just that. I compared a friend of mine's Reader to my Reader, and the colour of the page and "ink" is VERY diffferent between the two.

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