what exactly is the difference, why does one cause eye strain and the other don't? is this the same as lcd and crt tv's?
why are LCD's easier on the eye than CRT monitors?
- Thread starter Solodays
- Start date
LCDs don't constantly refresh like CRTs do. They only refresh when the image changes; so when you're looking at a static image, the screen isn't updating at all and there's no flicker like with a CRT.
The main thing is that LCD's draw the entire screen at once using rotating pixels of liquid crystals. CRT's draw the screen line by line 60-120 + times per second. This horizonal scanning or "sweeping" of the screen means that it's not creating a solid image like LCD's are, merely the illusion of a solid image because the screen is redrawn so quickly it tricks our eyes (or, more correctly, our brain).
The main cause of eye strain on CRT's is an inadequate refresh rate - 75 Hz is the minimum considered "flicker free" (75 Hz means the entire screen is redrawn 75 times per second), while some people can detect flicker even past 100 Hz.
If you want to see flicker on your CRT, set 60 your refresh rate to Hz or even better 52 Hz. It won't be pretty
.
LCD TV's operate exactly like LCD monitors and CRT TV's operate just like CRT monitors; the only difference is that CRT TV's (non-HDTV's) have fewer lines to draw because it's a lower-resolution image.
When you hear that high pitched 'hum' coming from your CRT TV or monitor, that is (I'm pretty sure) the sound of the electron guns sweeping the screen (ie drawing the image that you see).
The main cause of eye strain on CRT's is an inadequate refresh rate - 75 Hz is the minimum considered "flicker free" (75 Hz means the entire screen is redrawn 75 times per second), while some people can detect flicker even past 100 Hz.
If you want to see flicker on your CRT, set 60 your refresh rate to Hz or even better 52 Hz. It won't be pretty
.LCD TV's operate exactly like LCD monitors and CRT TV's operate just like CRT monitors; the only difference is that CRT TV's (non-HDTV's) have fewer lines to draw because it's a lower-resolution image.
When you hear that high pitched 'hum' coming from your CRT TV or monitor, that is (I'm pretty sure) the sound of the electron guns sweeping the screen (ie drawing the image that you see).
Most people can't notice the flicker (or it's not noticeable enough to be a problem for them) above a certain refresh rate. For me, that refresh rate was 85Hz. I still think my LCD's a bit easier on the eyes though, don't really know why for sure. I would imagine that the flicker still gets to you even if you don't consciously notice it - just a guess though.
yhelothar
Lifer
- Dec 11, 2002
- 18,409
- 39
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It's all subjective in the end. I'm actually more comfortable looking at CRTs, without trying to stare through the washed out blacks and ghosting that are on some monitor. Ghosting is actually fine for me now though. But the black levels problem is difinitely a large issue on LCDs.
Originally posted by: jiffylube1024
The main thing is that LCD's draw the entire screen at once using rotating pixels of liquid crystals. CRT's draw the screen line by line 60-120 + times per second. This horizonal scanning or "sweeping" of the screen means that it's not creating a solid image like LCD's are, merely the illusion of a solid image because the screen is redrawn so quickly it tricks our eyes (or, more correctly, our brain).
The main cause of eye strain on CRT's is an inadequate refresh rate - 75 Hz is the minimum considered "flicker free" (75 Hz means the entire screen is redrawn 75 times per second), while some people can detect flicker even past 100 Hz.
If you want to see flicker on your CRT, set 60 your refresh rate to Hz or even better 52 Hz. It won't be pretty
LCD TV's operate exactly like LCD monitors and CRT TV's operate just like CRT monitors; the only difference is that CRT TV's (non-HDTV's) have fewer lines to draw because it's a lower-resolution image.
When you hear that high pitched 'hum' coming from your CRT TV or monitor, that is (I'm pretty sure) the sound of the electron guns sweeping the screen (ie drawing the image that you see).
i have been using this 17" crt for about 2 years at 60hz and i dont see any flicker at 60.
when you say it drawns 75 times a sec at 75 hz, so that means it flicks 75 times a sec? isn't the lower the refresh rate the lower it flicks then?
I also find CRTs easier on the eyes. Most LCDs I have seen are too bright for nighttime use, even at their lowest brightness settings, and the poor blacks and screen door effect make things worse. They aren't as straining in the daytime though. At least 100hz in windows and 85hz in games is generally good enough for me as far as the CRT flickering goes.
lcd monitor are exactly the same as lcd tv's. howcome the price is so different from each other. on average you could get a 17" lcd monitor for about $350 and that's about $20 an inch, on the other hand a 37 lcd tv cost around $2000 and that's about $54 an inch. so basicly lcd tv are more expensive than pc lcd monitors. WHY?
im about to dupe my crt monitor for a lcd monitor, i think you're one of the very few people that prefer crt over lcd when it comes to the eye department, not quality wise. doesn't crt produce radiation? i can't stand the light come out of my crt monitor.
Some words of wisdom. You dont have to "detect" the flickering on a CRT to suffer from eye fatigue.
No matter how you twist it, after 8h in front of a good (not one of those trash cans that are too bright) LCD, your eyes will have suffered less than the eyes of somebody doing the same with a CRT of high quality.
No matter how you twist it, after 8h in front of a good (not one of those trash cans that are too bright) LCD, your eyes will have suffered less than the eyes of somebody doing the same with a CRT of high quality.
Originally posted by: MoPHo
because the monitor refreshes faster than your brain can comprehend...
rofl
Certainly not always the case. LCDs cause rather serious eye fatigue quickly for those whose eyes focus quickly(not to mention nausea). Also those with better levels of vision can bring themselves into headache territory extremely quickly as their eyes keep trying to focus between the screen door and the image it is displaying.
went from a 85hz refresh CRT to a 19" LCD and I have NO MORE eyestrain PERIOD....... 16hours of Lan last weekend and my eyes felt great afterwords, with My CRT I had to take decent break every hour.
When I stopped using CRTs my monitor setup was:
Monitor1 ViewSonic P817 21" shadow mask
Monitor2 ViewSonic P225f 22" aperure grille
-both set to 1600x1200 @ 85Hz
Various Matrox and ATI cards (last used w/ATI Radeon 9800XT)
I now use:
2 x 21" Samsung Synchmaster 213T TFTs
Monitor1 DVI-I port
Monitor2 VGA port
-both set to 1600x1200 @ 60Hz native.
ATI Radeon 9800XT
I can spend as many hours as I like doing anything I wish and never experience any vision issues
with the TFTs. No artifacts in gaming either (ie BF1942/BF2).
After a few hours of text reading on the above CRTs, I would get eye-strain. Especially with the aperture grille model.
I will never go back to CRTs.
Monitor1 ViewSonic P817 21" shadow mask
Monitor2 ViewSonic P225f 22" aperure grille
-both set to 1600x1200 @ 85Hz
Various Matrox and ATI cards (last used w/ATI Radeon 9800XT)
I now use:
2 x 21" Samsung Synchmaster 213T TFTs
Monitor1 DVI-I port
Monitor2 VGA port
-both set to 1600x1200 @ 60Hz native.
ATI Radeon 9800XT
I can spend as many hours as I like doing anything I wish and never experience any vision issues
with the TFTs. No artifacts in gaming either (ie BF1942/BF2).
After a few hours of text reading on the above CRTs, I would get eye-strain. Especially with the aperture grille model.
I will never go back to CRTs.
Just to let people know, you're not "wrong" if you find a CRT easier to view than an LCD. LCDs tend to be bright which can cause strain. CRTs flicker which can irritate some peoples' eyes. I think most people find LCDs easier on their eyes. When I used a 17" CRT at 85 Hz, I got headaches every day for years and didn't even know it was the monitor causing it. I think I was fine at 120 Hz or so, but I could only reach that at 640x480. Since I've used an LCD, my eyes and neck feel so much better. As long as you keep the brightness under control on the LCD, I don't know how you'd get strain from it honestly. An LCD may be hard for your eyes, but it's probably going to fix your head/neck aches.
As for CRT radiation, the newer saddle-saddle deflection yokes block most of it, whereas back in the day they used saddle-toroidal yokes.
http://www.meko.co.uk/saddle.shtml
As for CRT radiation, the newer saddle-saddle deflection yokes block most of it, whereas back in the day they used saddle-toroidal yokes.
http://www.meko.co.uk/saddle.shtml
I had the exact same experience.
I love the added brightness myself. It might be a bit much in pure darkness, but I can always turn it down on the LCD, and if thats not enough (which it is), my video card control panel will essentially send it black if its still too bright.
SPARTAN VI
Senior member
- Oct 13, 2005
- 803
- 0
- 76
Same reason why you don't see the lights in your house constantly flickering, too. It seems constant, but if you ever recorded a light, played it back and slowed it down (assuming your camera is recording over 60fps) you'll see that even your desk light is flickering. Ever notice on TV when they show some computer screens, that they're flashing? That you see this horizontal bar going from the bottom up?
It took me a while, but I eventually developed this condition where I can't stare at a 60Hz monitor for too long without getting a headache, running nose, and watery eyes. Others at my work place complained about this problem, too. A few clicks later, I was at 85Hz, and my coworkers are now headache free, too. Seeing a monitor at 60Hz and 85Hz is like black and white to me, now.
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