Does Hz rate hurt your eyes?

[Chowdy]

Hey, i duno i can't make a poll so i'll just ask. I know some friends who see no difference between 60hz (gah) and 75hz. However, if i'm running a game or desktop @ 72hz it hurts my eyes and gives me a headache, but 75hz does not. Is anyone else sensitivity to hz rate? Who isn't?

:sn:

[secretweapon]

I defintely see the difference when it goes below 85hz

[Jeff7477]

yea, anything below 85hz I can see flicker.

[ajrettke]

Yeah, I set my hz as high as I can go, low refresh rates hurt your eyes (give headaches and such, not hurt your vision) if your in front of your monitor for a like more than an hour.

[Chowdy]

Wow, so i'm not the weird one, my friend who doesn't notice refresh rates is. Good to hear ;)

[bchur83]

I usually run mine between 85-100hz. Anything less, and I get a headache in less than 20min.

[Grov]

I could tell the difference when i was on my uncle's LCD yesterday which he had at 60hz.

[SevenSixTwo]

I could tell the difference when i was on my uncle's LCD yesterday which he had at 60hz.

You can't see "the difference". You are just a wannabe :p

[Cyrix_2k]

I could tell the difference when i was on my uncle's LCD yesterday which he had at 60hz.
lol

Yes, I can see flicker if a monitor is set below 85hz. I could see flicker on my Gateway EV900 when it ran at 110hz! For those of you who can't see flicker, set the monitor at 60hz, put on an all white screen, and look at the monitor from your peripheral vison. Now try it at 85hz and tell me you can't see a difference.

[apunkrockmonk]

He called you a wanna be because refresh rate doesn't matter on an LCD it refreshes the whole monitor at the same time instead of one line at a time on a CRT.

[Chowdy]

Yea, i agree, flicker is noticable at frequencies below 80-80hz. I like 72hz+ though, because it's just comfortable. I only get nauseous after about 12 hours, and that's probably due to other factors (IE: LAN party fatigue ;))

[Shuzzy]

85hz is pretty well accepted as a comfortable setting for most people. i won't go any lower. ii even find 75hz uncomfortable. unfortunately this means i can't game at 1600 x 1200 cause my monitor will only do 75hz there. :(

[N1vek215]

Lol, that's weird, I've had my monitor for 60hz for about 2 years already, and I jsut read this thread and put it up to 75hz. And quite frankly I think I got used to 60hz, cause I really can't see a difference at all. Maybe I'll see in games or something.

[Voltron]

85 is the lowest I can do and thats the highest my monitor will go. :( Lcd's are allot easier on the eyes.

[Radical]

I don't notice the difference, but that may be because I use an LCD.

[Cyrix_2k]

I don't notice the difference, but that may be because I use an LCD.
Yeah, you won't see a difference on an LCD. BTW, I'm on an LCD@60hz too.

[Timelessblur]

I can see 60 on a CRT. It really gets to me. Now that I been on a LCD for so long I anything below 75 gets to me.

I love how on LCD is does not matter.

[stan03]

as long as its above 70 its ok for me. but around 60 or below it makes me feel bad and crazy stuff like that.

[johan851]

Wow, so i'm not the weird one, my friend who doesn't notice refresh rates is. Good to hear
Most people who run 60hz (usually because they don't know any better) can't see a difference when you set it higher. But if you try setting it higher and let them get used to it, then turn it back down, most people see a major difference.

[Restorer]

The reason you can see refresh rate on a CRT is because it traces an electron beam across the screen, one row at a time, over and over. A pixel is only lit for a fraction of a second after the beam hits it. LCDs digitally update the display all at the same time, and so they are able to keep the image on the screen until it's time to update. OLED displays will have to same capability to keep the image always on, and simply change the parts that need it instantaneously.

[Electron Chaser]

So for all you guys that can see the refresh rates unaided with a camera or using peripheral vision or a filter. Must really hate all the lighting in your house as well since the AC power that runs them also oscillate at 60Hz.
Watching TV must be torture then as well, probably have to keep a bottle of asprin next to the remote control.

Hmm smells like a pasture in here. Oh look and there is the bull.

[Cyrix_2k]

So for all you guys that can see the refresh rates unaided with a camera or using peripheral vision or a filter. Must really hate all the lighting in your house as well since the AC power that runs them also oscillate at 60Hz.
Watching TV must be torture then as well, probably have to keep a bottle of asprin next to the remote control.

Hmm smells like a pasture in here. Oh look and there is the bull.
TV's interlaced and I can't stand flourescent lighting.

[Voltron]

I know Ac is 50/60 Hz but I can't see my lights flicker (regular bulb lights) or my TV but I can instantly tell if a monitor is below 75 Hz. Espically out of the corner of my eye. When I play a game I can allways tell if it's locked @ 85 or is running lower.

Theres no reason to lie about somthing so trivial as this.

[Electron Chaser]

TV's interlaced and I can't stand flourescent lighting.

Cool I got everyone's attention. :p I'm just messing around.

Seriously most people can see flicker up to 85Hz (on a CRT only) while not perceptively generally. most "functional" flourescent lights flicker at 120Hz so the human eye cannot even pick up the flicker at that speed . I personally don't care for them mainly for the light spectrum they give off. However most people that develop headaches is due to gaming and staring at very finite points on the screen for great lengths of time. Inadequate background lighting can also play a major role as well. In addition to not keeping the monitor at eye level. Just a little info :santa:

[xTrEmEoVrClOcKr]

Yup, I have a Viewsonic E90F and I can stand 75hz, but 60hz is horrible. I love 85 but it can only do 85hz on 1024 (Disgusting Resolution to Run at).

Edit*, I was talking to CandyManCan on the forums, and he gave me instructions to get my moniter to 80Hz (on 1280, wOOt) The good part is, it dosn't void the warranty.. :)

[Restorer]

TVs are interlaced and have much larger pixels, hence larger globs of phosphorus that need more charge to glow, and retain their glow longer. Bulb lights take hundreds of milliseconds to lose their light, so a 60Hz signal will not make them flicker. Fluorescent lights aren't as bad as a white monitor because they have a larger active range of voltage and their driver boards (fluorescent lights won't run straight from 120AC, in case you didn't know; they need to be brought up to a few hundred volts) sometimes use a more square-like wave, keeping them on for much longer per cycle.

Now that I think about it, it's entirely possible that people that are extremely sensitive to flicker can't stand some LCDs, since they are backlit with a couple CCFLs. A sub-par driver board could cause a fair amount of flicker there.

[Chowdy]

Interesting. What is it that makes the low hz rate cause headache and maybe nausea?

[ghettocomp]

I Keep the Refresh rates up around 80Hz while gaming. The flicker is much more noticable to me, And I get kinda nauseated from it. anything else does not bother me too much, probably because I am not watching the monitor as intently then.

[Veland]

85Hz is comfortable for me, but down to 72Hz is ok. 60Hz is pure pain! But the weird thing is that I find LCD monitors more tireing for my eyes! I knoww it shouldn't be so, but after a couple of hours my eyes are tired, I never get that from other monitors.

So I'm still running CRT! :attn:

[Jognt]

i guess ive gotten used to 75hz.. i can also tell when a monitor is running at 60hz, and it annoys me a lot because i see those lines run along the screen (as if your watching the screen via a camera) but fortunatly i only see that from the a corner of my eyes :) (when i look left, right, above, below the screen, i see it)

I just set my monitor at 85, 90 and 100hz, and i must say that at those frequencies i cant read what it says.. i can read it, but i get the feeling i need different contact lenses :p

[Syx]

I used to run at 60hz and it was normal for me, now I run at 85hz and when I go back to 60hz it's like having a seizure.

[Vio1]

ya... your eyes get tired from the vibrating light. Its the same with florecent lighting too. Every time the light flickers, the eyes dialate and revert.... so many times a second..

[Sentential]

ya... your eyes get tired from the vibrating light. Its the same with florecent lighting too. Every time the light flickers, the eyes dialate and revert.... so many times a second..
Yea my eyes were killing me at 60 hertz. Hell at one point I was considering using sunglasses lol. Thnx for the heads up, my monitor is now at the rightful 85hz....and boy is it alot better now.

[N1vek215]

wow, I really have become used to flickering then. Like I said before for YEARS I've had 60hz on, not knowing any better and I would be on the comp from when I woke up to when I went to bed. Right now it's at 75 (the highest) so I'm gonna see if in maybe a month I'll be able to notice the difference. No wonder my eyesight as gone to hell :(

[secretweapon]

Yeah, I learned throughout the years, painfully I might add, the most important piece of hardware is your display. Never spare a penny on it! Your eyes are priceless.

[Nightfall]

I have recently bumped my main system at home back up to 85hz from 75hz, as I had been suffering from headaches almost daily, and now they have gone. I don't notice a difference on-screen, but I'm not going to change it back to test that theory :)

[d4rr3n]

Anything below 100 hz and i can notice the flicker.....and my monitor only does 77 hz at 1600x1200 and 90 hz at 1280x1024. I have to go down to 1152x864 to get over 100 hz :temper: .

[tom10167]

I switched the refresh rates around, it's at 85Hz because everyone said to. I used to keep it at 65... still not sure on the difference..
"Flicker?"

[johan851]

still not sure on the difference
Switch it back to 60hz after leaving it at 85 for a few days, and then you'll definitely see the difference.

[Lifthanger]

maybe a dumb question. but is it the same for tfts? my samsung 19'' only does 70Hz at 1280*1024... may this cause headaches? I thought 70Hz on a tft is not bad.

[SevenSixTwo]

Lifthanger, here is a breakdown for a VGA link:

1.) Video is a digital signal inside the computer
2.) It gets converted into an analog signal and sent to the monitor
3.) A TFT/LCD monitor will convert that analog signal back into digital. The HZ are used to get proper communications between the encoder in the computer and decoder in the monitor. Most digital monitors are designed to run at 60HZ. Higher/lower than recommended will actually degrade quality.

[Timelessblur]

I think for those people who can not stand anything below 100hz should give up the CRT and just move over to LCD. LCD refresh rates does not matter since a 60hz refresh rate on a LCD and 100hz refresh rate are exactly the same. only the pixical that need to that change are redrawn and the screen updates all at one time.

[DocGiggs]

Hrmmm... I can't stand watching TV, makes me sick after awhile, which is why I stopped playing console games years ago. I had to move away fromCRT's because no matter how high I set the refresh, the flicker still got me. I don't turn lights on in my house if I can help it. When I do use lights they are small, and in another room, and usually halogen. I can't ride in any moving vehicle without my eyes closed or asleep because I will hurl for days on end, no joking. I'm super sensitive in my eyes. Got it from my dad. we always have blood shot eyes from irritation. Then again, I have natural 20/10 vision in my right eye and 20/12 in my left. Same with my dad. Funky huh?

[Nico3k]

I have SERIOUS problems (very serious) with any refresh rate under 85Hz...
I after 1-2 hours I start feeling really sick and I get a throbbing headache. It is just HORRIBLE. I can not use computers in alot of places that have them set to 60-65Hz because I just feel like I am going to puke..

On my home computers I have refresh rate set at 120-160Hz. Right now I am running at 120Hz and it is alright.

[Mr.Guvernment]

anything lower then 85MhZ for me hgives me headaches

My boss has dual 19' @ 1600 x 1200 each and has them @ 60mhz and he wont change it!!! i bet in a few years though he WILL need glasses!


TfT's - no they can sit @ 60mhz and u wont notice anything.

[Dylruss]

I used to have a monitor here at work that was at 60Hz. I got migranes after about 1 1/2 - 2 hours. So after they got a 19" flat screen that does 75-80Hz at 1600x1200 for me, I haven't been happier.

Anything under 75Hz, is just horrible for me.

[Redstone]

I have SERIOUS problems (very serious) with any refresh rate under 85Hz...
I after 1-2 hours I start feeling really sick and I get a throbbing headache. It is just HORRIBLE. I can not use computers in alot of places that have them set to 60-65Hz because I just feel like I am going to puke..

On my home computers I have refresh rate set at 120-160Hz. Right now I am running at 120Hz and it is alright.

I can't last more than a minute or two with anything under 85Hz my CRT at work. I got a LCD for home use and will never go a back to a CRT, and I would have a LCD at work if I could. For me there is a huge difference between 60Hz and 80Hz and big difference between 75Hz and 85Hz on CRT's. I haven not had the chance to view anything above 85Hz on a CRT.
Again LCD is the only way to go for me. Virtually no eye strain.

[qualhiveldorf]

My 8 year-old monitor will only run @ 1024x768 @ 75hz I've gotten used to it but, I am really starting to want an LCD or at least something that will do 1600x1200 @ 85 hz.

60hz is just gross, I just feel sick and my eyes will be sore afterwards.

[t_dub]

I guess I'm crazy then because I've had my 19" Viewsonic E90f at 1600x1200 at 60 hz forever, like 3 years. Doesn't bug me any, I'm on the computer all the time. It bugs me more to set the resolution any lower. I can't stand having the resolution any lower then 1280x1024. You can't fit anything on the desktop and it's so pixelated. That's just my personal preference.

I just checked my setting though and I can override it. I can force it to display 120hz at 1600x1200 and I tried it for a second and it seemingly worked. (I started going up 70,75,85,100,120) Couldn't tell a difference right away that's for sure. Next monitor I get will probably won't be for another 3 years when a graduate. Who knows what'll be out then...

[Mr.Guvernment]

^^ it may work but hit the menu buttons on the front of your monitor - same ones u use to adjust sieze and it will tell you what it is actually at

i have ahd monitors in windows it says 100mhz but using the monitor buttons it is only @ 85 or something.

[diggingforgold]

I normally run at 60Hz. On my monitor (diamontron/trinitron), font (for instance) sharpness decreases for some reason. I've become acustomed to 60Hz because of this reason. But as far as flicker- I don't notice it unless I enter ranges that are not compatible with my monitor, or if I go from 60 to 85 and then back down to 60.

In other words, it doesn't bother me.

[H2]

I read at least 8 hours a day on my computer.
Switching to a 19" Viewsonic LCD was the best thing I ever did for my eyes. My eyes are much less strained reading. On my CRT Viewsonic I have used 85hz for years and that helped, but LCD is better if you can swing it. If you wear glasses like I do, you can get a coating on them to cut down glare which helps to.

[hafa]

This thread really serves as a great exaple of how personal preference and individual perception can be more relevant than technical specifications. While t_dub does not mind 60hz, but must have a high resolution on his screen, I have such a significant problem with anything at 60hz that I'll adjust a customer's monitor refresh rate before doing anything else on their machine. Even 15 seconds at 60hz can start to give me a headache. I have no problem, however with 800 x 600 if required.

[DanaG]

At my high school, the library computers are all locked at 60Hz, so I see __o[} {]o o[} {]o__ two rows (o's are chairs) times 10 of flickering monitors. I can't stand it. What's worse is the display control panel is locked out, so I can't change it. I have to be sneaky and use an external utility.
One rather stupid thing is that the Display control panel is locked out, but right click and "set as wallpaper" is not. They've locked the door OPEN! On one computer I found this: IE6,large buttons, text below, address bar, google toolbar, yahoo toolbar. The toolbars were locked, so 1/3 of the screen was entirely comprised of toolbars!

[PLOBBY]

I just bumped my refresh up to 90 from 65....ill set it back down after a week or so to see if i can tell....i did get a headache after a lil while gaming though...hopefully thats the reason

[iNterBeiNg]

I can't stand 60 hz.. get a headache after just 20-30 min if I get stuck using a monitor in that refresh rate. I use 75 hz most of the time, gotten used to it since thats the best my monitor can do at 1152x864.

[mdcomp]

After a few hours, 60Hz really bothers my eyes. They get all dried out and they burn, but I try to stay in the 80Hz range. In that range, my eyes are just fine and dandy.
:)

Matt

[Spion]

i have no choice but to be at 60Hz :(

[2 stars with this post :)]

[Thanatos_2005]

i'm running a 1024X768 @ 100Hz and I actually found it hurt my eyes more than when it was set to 85! That could have been from the fact that I'd been going for 10 hours straight though :P

[PLOBBY]

yea, maybe...10 hours seems a little lengthy

[lennytiger]

My Laptop TFT runs at 60Hz (as most do), and I enjoy reading and working on that.
My Main rig has a CTX 17" and thats set to 60Hz, although now having read this thread I have set it to 72Hz (the highest it will go without screwing the image up)
I will test this setting for a week and tell you how I feel.

With it set at 60Hz i found my eyes were constantly bloodshot and itchy, hopefully with the refresh rate change this should improve :)

[Cyrix_2k]

yea, maybe...10 hours seems a little lengthy
just a little...

I've had 24+ hour programming sprees before, but I was running on a 15"LCD on my main rig, and a 14.1"LCD on my laptop.

[ozzlo]

for some reason with LCD's 60hz dosen't affect me but I need higher than 80hz for long term viewing (2 or more hours) on a crt. seeing how I have had 3 day starcraft a thons (only left the comp for 4 hours of sleep, food and restroom) in the past I'm amazed that my eyes diden't start bleeding from the 60hz back in the day.

[johan851]

Refresh rate on a LCD doesn't really matter, since the pixels are either on or off. Since a CRT is actively redrawing the picture, the picture is actually flickering, while the picture on an LCD is not.

[Know Nuttin]

with CRT's, minimum recommended is 75hz.

it doesn't actually hurt your eyes, but it's a subconscious thing to most. what it does do is put a strain on your eyes and gives you a headache eventually.

johan851 is right, LCD's only have 2 states, on/off. The refresh rate is there to satisfy VGA compatibility. LCD's deal with response time, which is in ms, not in hz.

[wizard james]

yea..

i been on computers with 60 hz (schools) and you cant change them unless i bypass the admin .. little tricky on the not getting cought.. i am a prime person to be watched as i took over the admin database befor on school..

but if i gota read something in school at 60hz on the crts.. i just quit and do it at home.

my home one is set at 85 ..max it will do ... and its fine. 90 would nicer

[Silversinksam]

I had a 21" NEC crt that ran 1024X768 @ 85Hz and it gave me constant headaches, I then bought a Sony tubed 21" crt and now run 1024X768 @ 120Hz and 1280 at 100Hz and I've never had another headache.

I prefer CRT's until the large 20+" LCD's hit a certain price point, then I may buy one.

[Aslan]

I have my monitor set at 1280x960 @ 85Hz and it's fine for me. Anything lower than 85Hz and I can notice, with 72Hz and below giving me headaches.

[xTrEmEoVrClOcKr]

Finally, I got my moniter to run @ 80Hz :). I got a tip from Candymancan (on the forums) and he helped me adjust my moniter to 80Hz. Im glad it isn't hurting it YAY!

[JohnDoemakt]

As most of you 60 Hz is not acceptable for me.
After a few minutes I get tears in my eyes and I have to sit at a greater distance. (~A meter or so)
75 Hz is absoulute minimum, though I use 85 Hz (1280x1024) on my desktop and 100 Hz (1024x768) for gaming although my SyncMaster 959NF has more to give.
This is because when I go over 100-120 Hz sharpness decreases, and text gets harder to read. 85 - 100 Hz is recomended for most monitors because it normaly gives the best image and less iritation than 60 Hz.


Whats strange is that I can't stand most LCD monitors. After just a few seconds of use I get tears in my eyes and I have to close them. (just like looking directly at the sun)
But this does not matter much, because CRT is IMHO so much better than LCD.

[Timelessblur]

I think some one running an LCD at full brightness. I always daul down the brightness on an LCD because at full forces it is really bright.

I honstly can not stand using CRTs for long pierods of time any more no mater what there refresh rate is due to the simple fact that I am so used to my LCD and plamsa screen monitors (Desktop LCD laptop is a plasma) so when I go home I use my laptop as my computer over the family computer due to the CRT just bugs me.

Btw the max refresh rate is 120hz. This is due to the limits of the AC power we run on. it runs a 60hz but it is posible to up it to 120 hz if you converit it ot DC. Forcel likes flicker at 120 hz (you have a spike in each dirction so you need to double there AC hz) Monitor are trap at the same limitions

[Grov]

I ran my 17" CRT at 85hz, and i run this CRT at 100hz 1280, so i wouldn't know.

I noticed a difference on me uncles TFT, at only 60hz.

[Timelessblur]

I think we have made it Clear it is scientificly IMPOSSIBLE to beable to see a LCD like monitor.

The people who claim they can see it are imanging it. They are looking for it for it there for they can see it. On a CRT I can tell a monitor is at 60hz by looking at it because yeah I can see the flickering.

It pretty easy to prove that those people who say they can see LCD refeshing are imaging it. Find out what htey set there CRT and set it at 85 hz then ask one those people who claim they can see an LCD refreshing and tell them that the monitor is at 60hz and see what htey say about screen flickering. The answer you will get back is yes.

I had a friend who did not see a thing in my LCD until he found out it runs at 60hz then he claimed it was a refreshing problemed. I ask him to think back to before he knew and then he reliezed the truth and boom he never saw it again. Now he wants an LCD.

[FyreDaug]

I have my 17" LG crt at 75hz all the time. I find that when I use <72hz my eyes lose focus and I try to focus on nothing. Its the wierdest thing, at school we had these really sh--- monitors and they would only run 800x600 at 60hz. It was so unbearable I wouldnt even use the computers. Only when I had to and I had to sit far away.

Lights drive me crazy, the sound of a tube tv drives me crazy and my 50" hdtv even annoys me. Those high pitched squeels. My 50" isnt as bad as other though, its barely noticable

EDIT: Oh and with LCD's the pixels look like rectangles and they look like they dont belong and it makes the picture look warped. No one else notices this though. I cant use LCD monitors.

[Timelessblur]

are tye LCD you are using running at there nativie reslotion. if not yeah they will starting having problems like that

[emboss]

I used to be fine at 75Hz, but could see flicker (and hence hated) 60Hz. For the past 3 or 4 years though I've been running at 85Hz (and can't tell any flicker on it), and have just realised I can now easily see 75Hz flicker. I was over at a friend's place and was looking at his computer and thought ouch! His screen was (to my eyes) flickering horribly, even when looking at it straight on (ie: not periperal vision). I asked him why he was running it at 60Hz (as that's what it looks like) and he said he wasn't, and that he was running it at 75Hz. Sure enough it was, but I couldn't stand it. I wonder how long it will be before 85Hz becomes no use ...

Also, I can't watch normal TVs without getting horrible headaches. This has been fixed by buying a 100Hz TV :)

[100mbHD]

would setting your refresh rates higher decrease the life of your monitor?

[Grov]

I think we have made it Clear it is scientificly IMPOSSIBLE to beable to see a LCD like monitor.

The people who claim they can see it are imanging it. They are looking for it for it there for they can see it. On a CRT I can tell a monitor is at 60hz by looking at it because yeah I can see the flickering.

It pretty easy to prove that those people who say they can see LCD refeshing are imaging it. Find out what htey set there CRT and set it at 85 hz then ask one those people who claim they can see an LCD refreshing and tell them that the monitor is at 60hz and see what htey say about screen flickering. The answer you will get back is yes.

I had a friend who did not see a thing in my LCD until he found out it runs at 60hz then he claimed it was a refreshing problemed. I ask him to think back to before he knew and then he reliezed the truth and boom he never saw it again. Now he wants an LCD.

I don't really care what you say, i definatly saw a difference.

[100mbHD]

would setting your refresh rates higher decrease the life of your monitor?

anybody?

[hafa]

anybody?

As long as the refresh rate is supported by your monitor at a given resolution, it will not affect the life of your monitor whatsoever. Modern monitors provide data to the OS, and Win XP will not allow you to set a refresh rate which is too high for a given resolution unless you intentionally uncheck the "Hide modes that this monior cannot display" checkbox.

[100mbHD]

k, thanks a lot, i was just curious, i am more relieved now to set it at higher refresh rates.

[asusradeon]

my monitor is old !!
i cant have my refresh rate above 65hz
but i dont get a headache, and im on it from 4:00 to 11:00 every night !!

[Albuquerque]

I don't really care what you say, i definatly saw a difference.
Then you would be the person reporting side effects from the placebo during a drug test.

As has already been pointed out, liquid crystal pixels have two possible settings: on, or off. There is no "flicker" because they are not being constantly redrawn by the cathode ray in a standard tube monitor.

Each pel in an LCD panel requires a certain amount of time to ramp UP to full contrast, and then a certain amount of time to ramp DOWN to no contrast. The total of these two (UP + DOWN) is the response time in milliseconds. A 25ms response time display usually means each pel takes about 10ms to ramp up, and then 15ms to ramp down.

There is no way to make them go faster OR slower. It doesn't work that way.

Thus, no matter what you think you saw, the image really didn't change.

[Timelessblur]

Then you would be the person reporting side effects from the placebo during a drug test.

As has already been pointed out, liquid crystal pixels have two possible settings: on, or off. There is no "flicker" because they are not being constantly redrawn by the cathode ray in a standard tube monitor.

Each pel in an LCD panel requires a certain amount of time to ramp UP to full contrast, and then a certain amount of time to ramp DOWN to no contrast. The total of these two (UP + DOWN) is the response time in milliseconds. A 25ms response time display usually means each pel takes about 10ms to ramp up, and then 15ms to ramp down.

There is no way to make them go faster OR slower. It doesn't work that way.

Thus, no matter what you think you saw, the image really didn't change.

Well I may think I know what he saw. I noticed it yestday when I built a friends computer. It was cause by the graphic card. I got the drivers corrected and then the lines that where flickering on the screen disapeared.

That or it the imagei effect. Either way it an issue dealing with computer hardware or an LCD monitor getting close to the end of its life which is the same to better than a CRT. A 5 year lifespan at 24/7.

[whoever]

60hz kills my eyes, but my monitor has EMi interfeareence at 75hrz; although I can't explain it.

[Jimbob7]

60hz is ok, althought i just think it looks so bad, i normally run 1600X1200 100hz. LCD's are alot better to use im sure everyone will admit that, but you lose screen size to cost of what you could have with a CRT :(.

[consumer9000]

Anything under 85hz induces a serious migraine headache. Furthermore, I can still resolve flicker at 85hz. People though I was crazy so I went to an optometrist and had them test me, and sure enough, up until around 90hz I could discern flicker. Geeze...no wonder fluorescent bulbs kill me! :drool:
On a CRT I'm stuck running at 100hz...thank god for LCDs. No problems there other than ghosting.

[sunrunner20]

My School used to drive me NUTS!!! I can see flickering on anything at and under 75hz (:( my monitor can only go up to 75hz at this res) and they keep it set to 60hz because they are too lazy too change it. But, If you noticed I spoke of "Used", that is becuase I am an admin their now and can change that :santa:.
So, you can tell what computers at my school i've been on lately by two reasons,
1. If it can, the screen is 1024x768(highest res thats not obviously smaller than normal on the crappy monitors) @85hz
2. They keyboard is flat. I just can't use a keyboard that bends my wrists like haveing those stupid legs up does. (Side note: no wonder people get carpel tunnel.....)

P.S: its funny to see the technalogically challanged panic when I go into the bios to check something. "Ahh! its a virus! he broke the computer!" :cool:

[J So]

Thank God I'm not the only one!!! The first thing I do when I'm working on someone elses computer is jack it up to 75hz.. the flicker on 72 and less kills me! Everyone else swares they can't notice a difference so it's nice to see I'm not too big of a freak.

One other thing I notice that nobody else seems to. Can you guys hear the high pitched noise a TV makes when it's on but there is no volume or signal? The sound of that drives me crazy. I could be two rooms away and have to turn it off and everyone else swares they don't hear anything..

[sunrunner20]

LOL! :santa: I know EXACTLY what you mean, yea I can hear the TV too, though it might be becuase im <20 so my ears are not as worn yet.
note: I can also hear people texting on their cell phones accrost the room, as well as hearing "silent", aka vibrate mode, ring's as clear as a normal ring.

[ghastman]

Remember a higher Hz rate on a crt = fuzzier display
I find that 60, or 72 on newer crt's, produces the crispest image.
These settings produce the crispest image on the monitors i use, mostly trinitron tubes.

800x600 85 hz
1024x768 72 hz
1152x864 68 hz
1280x1024 60 hz
1600x1200 60 hz

I can feel my eyes twitch and will get a splitting headache if my settings are below....
800x600 43 hz (interlaced)
1024x768 60 hz
1152x864 68 hz
1280x1024 72 hz
1600x1200 85 hz

I won't notice the flicker if my settings are above...
800x600 60 hz
1024x768 70 hz
1152x864 75 hz
1280x1024 85 hz
1600x1200 100 hz

I run at 1280 at 72hz most of the time. I've been using high resolution for a long time, and it always has been a matter of how low you can drop the refresh for good picture quality vs where is the headache point. Component BNC cables REALLY REALLY help. I imagine DVI would be nice, but I don't have any LCD's (I can get 2 21" Trinitrons for one decent LCD).

I always set a monitor to 72+ when I can, and usually the user calls within a week and tells me their headache is gone. They didn't even realize they had one until it was gone.

[consumer9000]

Ahh youth is wasted on the the young... :attn:

[ghastman]

I can hear the sound on tube TV's too, sounds kinds like a flash capacitor on a camera thats charging up. You can tell when a tube is gonna die, its starts gettin loud.

I wonder about everyone's ability to see flicker at a certain hz rate creeping up over time. I have a Matrox Mystique 8 meg card flashed to run a 1992 NeXT 16" Trinitron at 1152x68hz. Its a fixed frequency monitor. I do not notice flicker at all. On my 2003 Viewsonic 17" Trinitron, that resolution produces noticable flicker. I would guess that is due to the phosphor's illumination time. TV's have a huge phosphor time, since their refresh is 60 hz interlaced(NTSC) or 50 hz non-interlaced(PAL). As new monitors come out, their phosphor times drop to have the ability to produce a clean image at high refresh rates. Thus the creep up of the flicker point.

If you can see flicker on an LCD, there is a problem with your setup. Some strange combo of driver/cabling/LCD. Most people have the opposite problem on LCD's, the image is so persistant that you notice blurring and smearing while playing games on 'em. The only LCD's I have access to are some crappy Gateway Profile's, I don't have set up like a traditional vidcard/CRT.

[RMgX]

Don't even need a minute with 60 Hz to get a funny feeling in the head and runny eyes. 85 Hz I can sit in front of for hours.