11-23-2008, 04:40 PM | #1 |
Karmaniac
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E-ink magnetic? Not mine!
E-ink screens are said to be magnetic.
If so, that would mean that any magnet could distort the image on the screen. We know from a previous post I posted that the e-ink screen seems to be affected by sunlight. So far I've quickly tested using a magnetic screwdriver,and a magnet from the fridge, but the screen does not seem to be affected by that. At this moment I have no more powerful magnet than those, but if sunlight affects the e-ink, surely a weak magnet should too. So far there's no evidence that the e-ink screen is magnetic. I have more the sensation it is a TFT / LCD screen stripped of the RGB grid, and backlight. The basic function of using a polarization filter and a Liquid+Crystal when adding a voltage the liquid will be like 2 opposing polarization filters, darkening the screen. This same principle is used in solar powered calculators, and some PDA's,only now there is a white plastic background. On the other hand, no matter how I tile the screen, the black ink does not appear to be 'floating' above the white screen, as should be with polarization filters. Makes me wonder, why, if the e-ink screen truly is magnetic, why it is not affected by standard magnets. I could start experimenting with more powerful speaker magnets,or Neodymium magnets soon,to see if the same applies here. Last edited by ProDigit; 11-24-2008 at 10:08 AM. |
11-23-2008, 05:08 PM | #2 |
Evangelist
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My BeBook has a warning in the manual to keep it away from magnets -- and has a magnet on the clasp of the cover that comes with it!
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11-23-2008, 05:21 PM | #3 |
Storm Surge'n
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11-23-2008, 06:28 PM | #4 |
Karmaniac
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A strong changing magnetic field can destroy feeble electronic equipement indeed; however if a magnet is gently applied and removed I see no harm.
Acording to the theory, the e-ink screen should become black(or white) when applying a magnet on it depending on the polarity of the magnet. So far doing so does not change the screen not even under prolonged periods of time. At least not on the Sony Reader PRS-505 |
11-23-2008, 06:32 PM | #5 | |
WWHALD
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Quote:
(* Definitely the body and not the case - small metal objects will stick to the relevant areas of the body, but not to the case) |
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11-23-2008, 06:36 PM | #6 | |
Storm Surge'n
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Quote:
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11-23-2008, 07:11 PM | #7 | |
Holy S**T!!!
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You may have a different result, but that's what my experience has been. I have four 1/2 inch by 1/8th inch Neodymium magnets right up close and personal. Hasn't done anything to the screen, or to the memory. Again .... that is my experience. |
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11-23-2008, 07:58 PM | #8 | |
Karmaniac
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This makes me think about the e-ink screen, if it is a hoax to believe there is really magnetism involved with this screen. I mean, if you look at esquire's 75'th edition e-ink screen,they used a similar approach on a plastic foil. I'm sure there was no magnetism involved there,since the screen is just laminated with 2 plastic layers,and there's absolutely no visible magnet there! There was not even liquid there (the screen was cut with a knife, and still worked),otherwise you'd expect the screen once destroyed, would leak,and stop to function. Last edited by ProDigit; 11-23-2008 at 08:02 PM. |
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11-23-2008, 11:02 PM | #9 |
Murderous Mustela
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My understanding is that the screen uses a static charge, not magnetism.
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11-24-2008, 01:05 AM | #10 |
Gizmologist
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That's more or less correct -- it's an electronic field effect of some sort, not simple magnetism.
For a time I was very much hoping that it would be something directly manipulable by a simple magnet, since that would have suggested a lot of possibilities in the area of input. But, alas, 'twas not to be. |
11-24-2008, 10:04 AM | #11 | |
Karmaniac
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However it would make it hard for the device to read that input, so the magnetic input would be limited on the screen, and can not be saved into the memory. Maybe an idea for future developements? |
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11-24-2008, 11:03 AM | #12 | |
Gizmologist
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If the display were built such that the processor could go back and "read" how each pixel was "set" (black or white), then it might be able to read it back out as a bitmap. At that point it might be possible to, for example, filter out the original "image" from the bitmap and store the remainder as notations that could then be overlaid back on the page when it was displayed again next time. That would most likely require a more complex display structure, but then again, it would also require a totally different structure from what they're using now. As for future development ... I like the idea, obviously, since I've spent a fair bit of time kicking it around, but I'm nowhere near a place to be able to answer whether it would be feasible or not. |
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Tags |
e-ink, magnet, magnetic, polarization |
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