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Johndays
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Can't work with LCDs nor plama displays
Hi to everyone,
I'm new here, so I'll try to present my problem.
I can't look to LCDs nor plasma displays. They give me headaches, eye strain, migraines, muscle pain,
and difficulty to sleep.
The more I'm exposed to a LCDs, the more I become photosensitive.
Every fluorescent light that I know give me a great discomfort. Some of them give me headaches or even
migraines.
I work with a CRT 100Hz (sony trinitron multiscan), and I have no problem at all.
But I can't work for long with refresh freq. lower than 100Hz. I can see the difference between 85Hz and 90 Hz.
I can look without problems to clock LCDs and to some monochromatic LCDs (at least the one that appears in my photocopier machine at work).
I've already tried LCDs at 100Hz, but the problem remained.
I believe that my problem is not related with EMF sensitivity. However, I may have some minimal sensitivity.
I've did many tests: TC, MRI, VEP, ERG, and a few others, but no problem was observed.
I've also did some tests with color lens (Irlen Syndrome), but nothing.
I believe that my problem is related with hypersensitivity to flicker.
I'm not sure if it comes from the eyes (high flicker sensitivity in the rods, for instance), of if it is some neurologic disorder.
What I can tell you is that LCDs and plasma displays do flicker.
There are indeed multiple sources of flicker:
I can see the refresh freq of plasma displays (50 Hz in Europe)
The LCDs pixels are TFTs. These are transistors that cannot be too much time under the same tension, so their polarity must be inverted at the refresh freq (typically 60 Hz) (http://www.techmind.org/lcd/).
The majority of the LCDs (plasma?)only support 6 bits of deep color per pixel, not 8 bits as believed (3 pixels * 8 = 24 bits = 16 Million colors).
To increase the deep color the display makers use dithering techniques, some of them are spacial, while others are temporal (also known as Frame rate Control http://www.xbitlabs.com/articles/monitors/display/lcd-guide_11.html).
The commonest is the last, it produces some flicker lower at freq. lower than 60 Hz (possibly lower than 30Hz) when showing some colors.
Most LCDs have CCFL backlight, which works at some kHz, but then, in order to dim the display, a PWM mechanism is applied to the CCFL (the CCFL is turned on and off at a rate of nearly 200 Hz).
Others LCDs have LED backlights, but again, when dimmed, the same PWM mechanism is applied, which might produce some flicker.
Finally, there is the sampling effect (see Nyquist–Shannon sampling theorem), even if any of the the referred flicker sources is above the Critical Flicker Frequency (CFF) (the freq above which we don't see the flicker), it might happens that the product of different sources may result in a lower frequency flicker.
--
John
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9/23/2008, 10:36 pm
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Heavycomputeruser
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Re: Can't work with LCDs nor plama displays
Yea I have problems with Plasmas and LCDs too
I'm using a Dell Trinitron from 2001 a P991 at 85 HRZ. I also work at Walmart and my eyes really bother me their because of the Florescent lighting. I work in the backroom most of the time where the lighting isn't nearly as bad.
SED seems to be the only hope which is similar to CRT.
Recently bought a P400 samsung projector and it's easier on the eyes but you I get Looming strain after prolonged use but it's better then a LCD or Plasma though. Can't really use it for a PC unless you have the right setup.
Last edited by Heavycomputeruser, 9/24/2008, 2:17 am
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9/24/2008, 2:16 am
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monitorp
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Re: Can't work with LCDs nor plama displays
John:
You may wanna look at this dialog between Sorenz & Heavy:
http://com3.runboard.com/bcomputermonitorpain.f2.t22%7Coffset=50
They're both using Samsung projectors.
Have you considered trying a projector?
I'm considering a similar one by LG Electronics (since LG, at least in the past, has put out quality stuff).
But that's still on back burner for me.
Meanwhile, I've just acquired Biopro Chips (from Biopro Technology), which thus far I've attached to my LG-flatron LCD monitor (but not to my tower, since they're not transferrable, so I decided to stick the 2nd chip on my radio instead, since I've become intolerant of radio frequencies as well).
Anyway, for what it's worth, I don't think this chip is helping me, but it may be premature to judge ....yet....
I think the BEST acid test, would be for me to take a bit of an absence from my computer, and instead limit myself to the radio. That way, if I don't get my usual reactions to radio-frequencies, then at least I'd know the chip works, even if only partially. Because if I wouldn't take a break from computer, lets say I'd feel my usual radiation reaction, in which case I wouldn't be sure if my illness is from the computer or from the radio.
Well.. so far that's one day gone, out of their 30 day money-back guarantee.
---
Monitorp, Administrator
Administrate sporadically, due to monitor health issues
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9/24/2008, 5:55 am
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Johndays
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Re: Can't work with LCDs nor plama displays
quote:
monitorp wrote:
Have you considered trying a projector?
When viewing presentations they are not a problem, but I'm not sure about using them all the time for production tasks. Nevertheless, It is worth a try.
quote:
I'm considering a similar one by LG Electronics (since LG, at least in the past, has put out quality stuff).
But that's still on back burner for me.
Meanwhile, I've just acquired Biopro Chips (from Biopro Technology), which thus far I've attached to my LG-flatron LCD monitor (but not to my tower, since they're not transferrable, so I decided to stick the 2nd chip on my radio instead, since I've become intolerant of radio frequencies as well).
Anyway, for what it's worth, I don't think this chip is helping me, but it may be premature to judge ....yet....
I think the BEST acid test, would be for me to take a bit of an absence from my computer, and instead limit myself to the radio. That way, if I don't get my usual reactions to radio-frequencies, then at least I'd know the chip works, even if only partially. Because if I wouldn't take a break from computer, lets say I'd feel my usual radiation reaction, in which case I wouldn't be sure if my illness is from the computer or from the radio.
Well.. so far that's one day gone, out of their 30 day money-back guarantee.
It appears that your problem is different from mine. While I can't discard some possible reaction, I have no big issues with electromagnetic stuff.
I'm now researching about some sort of temporal or occipital lobe issue. I've never had any kind of seizure; still, I'm not discarding the possibility of some kind of sub-clinical epilepsy.
BTW, did anyone check the possibility of treating the problem with some anticonvulsant drug such as valproic acid?
Thanks for your (quick) answers.
--
John
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10/14/2008, 5:27 pm
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SorenZ
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Re: Can't work with LCDs nor plama displays
I changed my LCD/CRT classical monitors for a led Videoprojector (Samsung P400). I have good improvement. But if i spend too much time on computer i feel tired and stressed anyway. Probably all lights have an effect on this.
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11/7/2008, 8:43 am
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monitorp
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Re: Can't work with LCDs nor plama displays
quote:
SorenZ wrote:
I changed my LCD/CRT classical monitors for a led Videoprojector (Samsung P400). I have good improvement. But if i spend too much time on computer i feel tired and stressed anyway. Probably all lights have an effect on this.
I'm wondering if you're within three feet of the CPU and/or projector, since both may emit strong EMFs from the back & sides.
You never know.
I'm saying that because I've developed symptoms to radio frequencies as well. (it used to be just from computer). And the closer I am to the radio, the worse it is.
Also, are you using a cordless mouse or keyboard, and is the mouse infrared? Maybe those types are worse, but I'm not sure since I haven't personally tried those.
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11/9/2008, 3:44 am
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rawfooddan
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Re: Can't work with LCDs nor plama displays
hey guys,
don't forget about outgassed toxic flame retardants which I feel is the root of our problems.
http://www.outgasreport.com
I can tell you a ducting enclosure works. suck the air from your computer and monitor into another room or outside and I'm telling you you'll notice a huge improvement.
I did.
if anyone would be interested I could make enclosures for you complete with hoses and fan
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11/15/2008, 11:47 pm
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monitorp
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Re: Can't work with LCDs nor plama displays
Dan, see my response to the enclosures idea here:
http://www.runboard.com/bcomputermonitorpain.f2.t63
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Monitorp, Administrator
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11/17/2008, 4:30 am
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Johndays
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Re: Can't work with LCDs nor plama displays
I bought a P400. It's nice, not as good as my trinitron, but nice.
The main drawback is the native resolution, just 800x600.
Since it is based on DLP technology I can see the rainbow effect, but I only notice it when whatching something more dark, like a movie. When working it is less noticeable.
The rainbow effect is allways there, when ours eyes do micro-movements our brain see it. Depending on the perception of each one, the ambient light, and the darkness of what we are watching, it may happen that some people are sensitive than others.
Nevertheless, it remains a good alternative, specially when I need to go somewhere and there is not a crt available.
Meanwhile, I will look forward into others "portable" projectors with higher native resolutions.
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12/3/2008, 12:16 am
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Heavycomputeruser
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Re: Can't work with LCDs nor plama displays
I just use it for movies and videogames I tired a RCA TV from Walmart like two years ago man that totally strained my eyeballs they don't make good CRT TV's anymore it seems ever since LCDs populated the market like a plague.
http://www.sed-tv-reviews.com/category/sed-tv
Keep a bookmark on this site =)
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12/3/2008, 8:11 am
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