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Re: Laptop Screen Problem

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On Sat, 17 Nov 2012, mike wrote:

> On 11/17/2012 9:44 AM, the wharf rat wrote:
>> In article<k8739t$db9$1@dont-email.me>, mike<ham789@netzero.net>  wrote:
>>> On 11/16/2012 5:14 PM, the wharf rat wrote:
>>> 
>>> Think you need to do some research on how LCD's work.  They're electric
>>> field devices.  Yes, there is a relationship between electricity and
>>> magnetism, but that ain't what's in play here.
>>> 
>>
>> 	If there's a moving electric field, there's magnetism.
>>
>> 	If "liquid crystals" weren't sensitive to magnetic fields then
>> LCDs might not exist.  Vsevlood Freedricksz is credited with discovering
>> the behavior; he discovered the Freedricksz transition by applying magnetic
>> fields to films of liquid crystals.
>>
>> 	I'd rather you explained my error than just make snide remarks
>> about how little I must know.  This is supposed to be a learning 
>> experience.
>>
>> 	When you put voltage into them, the dipoles line up, right? When
>> dipoles align you get paramagentism, no?  Liquid crystals are para-magnetic
>> as shown by Freedricksz...  Exposing an LCD to a sufficiently strong
>> magnetic field WILL cause the crystals to migrate. Magnetic fields alter
>> the flow of electrical charges.  What happens to the transistors in an LCD
>> when you expose them to a strong magnet while they're turned on?
>>
>> 	If you can explain why an LCD wouldn't be effected by a strong
>> magnetic field given this I'm sure I'm not the only one who'd appreciate 
>> it.
>
> My sincerest apologies.  You are correct.  You cannot have a dynamic electric
> field without creating a magnetic field somewhere in the universe.
> And if that field is STRONG, anything can happen.
>
> I'm confident that you and Mr. Maxwell can come up with equations describing
> how LCD's work in magnetic terms.
>
> I, however, will continue to use the simpler electric field model.
> I'm just stubborn that way.
>
> FWIW, here's an experiment I just ran.
> Take the strongest magnet you can find.  I used one from a hard drive.
> It's not the strongest magnetic field you can generate, but it did take
> a pry-bar to get it off the refrigerator.
> Set it on the display of your smart phone.
> Report your results.

You should have waited to publish the results.

I once did that with a Commodore monitor, and then panicked when the 
blotching didn't go away immediately.  I feared the magnet was too strong.
But it was just a matter of leaving the tv set off long enough so the 
degaussing coil would come into play when I turned it on.

I know I wouldn't have that fear with a big magnet and an LCD monitor.

    Michael

> I saw no, zero, none, not any change in the display.
> How about you?
>> 
>
>

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Laptop Screen Problem Enrie Membership <me2@privacy.net> - 2012-11-14 09:12 +0000
  Re: Laptop Screen Problem wrat@panix.com (the wharf rat) - 2012-11-14 22:29 +0000
    Re: Laptop Screen Problem Bob_Villa <pheeh.zero@gmail.com> - 2012-11-16 04:15 -0800
      Re: Laptop Screen Problem wrat@panix.com (the wharf rat) - 2012-11-16 18:39 +0000
        Re: Laptop Screen Problem mike <ham789@netzero.net> - 2012-11-16 13:52 -0800
          Re: Laptop Screen Problem wrat@panix.com (the wharf rat) - 2012-11-17 01:14 +0000
            Re: Laptop Screen Problem mike <ham789@netzero.net> - 2012-11-16 20:20 -0800
              Re: Laptop Screen Problem Bob_Villa <pheeh.zero@gmail.com> - 2012-11-17 07:08 -0800
              Re: Laptop Screen Problem wrat@panix.com (the wharf rat) - 2012-11-17 17:44 +0000
                Re: Laptop Screen Problem mike <ham789@netzero.net> - 2012-11-17 18:04 -0800
                Re: Laptop Screen Problem Michael Black <et472@ncf.ca> - 2012-11-17 22:30 -0500
                Cute magnet story (was: lcd blah blah blah) wrat@panix.com (the wharf rat) - 2012-11-18 18:46 +0000
                Re: Cute magnet story mike <ham789@netzero.net> - 2012-11-18 13:14 -0800
                Re: Cute magnet story wrat@panix.com (the wharf rat) - 2012-11-19 06:30 +0000
                Re: Cute magnet story ak621@chebucto.ns.ca (Richard Bonner) - 2012-11-24 22:44 +0000
                Re: Cute magnet story ak621@chebucto.ns.ca (Richard Bonner) - 2012-11-24 22:38 +0000
                Re: Laptop Screen Problem wrat@panix.com (the wharf rat) - 2012-11-18 18:24 +0000
        Re: Laptop Screen Problem Bob_Villa <pheeh.zero@gmail.com> - 2012-11-18 16:10 -0800
          Re: Laptop Screen Problem wrat@panix.com (the wharf rat) - 2012-11-19 06:39 +0000

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