60Hz screen refresh optimal?

Ashley van Gerven

Looking at the details of a Dell Ultrasharp flat monitor it lists the optimal resolution as:

1920 x 1200 at 60 Hz

I know 60Hz on a CRT will give you a headache, but what's the general opinion of refresh rates on LCD? Is 60Hz doable?

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Ravi Bhavnani

Yes, very. Unlike CRTs, refresh rates are of little consequence to LCD panels. If you want to compare LCD panels, look for one with a faster response time (if you'd like to use it to watch video). /ravi

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Shog9 0

60Hz sucks for CRTs because it produces a 60Hz flicker. LCDs have (well, should have) a constant backlight, so the refresh rate just determines how fast the screen can change. Anything under 85Hz bugs me for CRTs, but i've never noticed a problem with any of my LCDs; maybe gamers care, donno.

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DaveX86

60 hz looks nicer on my HP LCD than 85 hz ever did on a crt...a lot easier on the eyes too.

Member 96

I don't know why they would list that, quoting refresh rate stats for an lcd monitor is like an add for a modern car saying it has "crankless" starting technology. Entirely irrelevant.

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Harvey Saayman · Citizen 20.1.01

so then even normal light bulbs bug you as they flicker at a rate of 50Hz?? AFAIK the human eye cant "register" more than 30 or 40Hz

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blackjack2150

That can't be right. It would mean that any device which is plugged in should flicker at 50 Hz.

Harvey Saayman

Not unless its power is rectified, but a normal light bulb is connected directly on 220v @ 50Hz (voltage may differ where your from) That means that every 50/1 second the positive and negative switches around(graph looks like a sine wave) causing the bulb to fade in and fade out so to speak... 50 time a second If the power is rectified(like a power supply does), the AC is converted DC(after a transformer steps down the voltage) where the positive and negative stays the same(they don't switch around like AC)

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dave kelly

The flicker is caused by the difference in freqencies. ie if the refresh is 60 Hz, and the fluorescent lights are 60 Hz, one will be off by a bit compared to the other, and you get the difference between them as a beat.

LittleYellowBird

HarveySaayman wrote:

so then even normal light bulbs bug you as they flicker at a rate of 50Hz??

AFAIK Light bulbs don't flicker because the tungsten element glows all the time even though the current through it is AC. The element does not have time to cool enough between each cycle. Fluorescent tubes do flicker enough to give people headaches so you can get a version that functions at double the normal frequency for work environments (100Hz here in the UK).

HarveySaayman wrote:

the human eye cant "register" more than 30 or 40Hz

You can see higher frequencies than this. If you want to see something flickering try looking slightly to one side of it and 'watch' it out of the corner of your eye. It's your peripheral that can pick up fast movement or flicker. I believe it is a defence mechanism from when we had to watch out for predators sneaking up on us! :)

Ali

Harvey Saayman

Alison Pentland wrote:

The element does not have time to cool enough

your absolutely right, i didnt even think of that... I need some more coffee :rolleyes:

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benjymous

US power is at 60Hz, so their lightbulbs will flicker at 60.

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Brady Kelly

It's Friday, have a beer. :laugh:

A SINGLE-PHOTON TURNSTILE, a device in which photons are emitted one at a time under controlled circumstances, has been created by a team of scientists from Stanford (US), Hamamatsu Photonics (Japan), and NTT (Japan). Essentially the researchers use the quantization of electrical conductance to produce a quantization of photon emission. They put together a quantum well (the frontier between two thin semiconductor layers) containing a single electron (other electrons are dissuaded from entering because of a "Coulomb blockade" effect) with a quantum well containing a lone (comparably Coulomb blockaded) hole, and then cycle the voltage across the whole stack of layers in such a way that the lone electron and lone hole meet, mate, and make a lone photon. The resulting device, which operates at mK temperatures, is typically a tiny post some 700 nm tall and with a diameter of 200-1000 nm. (J. Kim et al., Nature, 11 February 1999.)

LittleYellowBird

Absolutely - helps you think straight ;)

Ali

Brady Kelly

I doubt it would this early (I have yet to start work), but it's always a nice thought.

A SINGLE-PHOTON TURNSTILE, a device in which photons are emitted one at a time under controlled circumstances, has been created by a team of scientists from Stanford (US), Hamamatsu Photonics (Japan), and NTT (Japan). Essentially the researchers use the quantization of electrical conductance to produce a quantization of photon emission. They put together a quantum well (the frontier between two thin semiconductor layers) containing a single electron (other electrons are dissuaded from entering because of a "Coulomb blockade" effect) with a quantum well containing a lone (comparably Coulomb blockaded) hole, and then cycle the voltage across the whole stack of layers in such a way that the lone electron and lone hole meet, mate, and make a lone photon. The resulting device, which operates at mK temperatures, is typically a tiny post some 700 nm tall and with a diameter of 200-1000 nm. (J. Kim et al., Nature, 11 February 1999.)

LittleYellowBird

Sorry to here that. I finish early on a Friday and the sun is shinning (which is a real novelty here in the UK) so I am looking forward to a chilled beer in about 4 hours time ..... :-D I will tell you what .... I will drink one for you too - I am good like that! ;)

Ali

Brady Kelly

Please do, thanks. :-D

A SINGLE-PHOTON TURNSTILE, a device in which photons are emitted one at a time under controlled circumstances, has been created by a team of scientists from Stanford (US), Hamamatsu Photonics (Japan), and NTT (Japan). Essentially the researchers use the quantization of electrical conductance to produce a quantization of photon emission. They put together a quantum well (the frontier between two thin semiconductor layers) containing a single electron (other electrons are dissuaded from entering because of a "Coulomb blockade" effect) with a quantum well containing a lone (comparably Coulomb blockaded) hole, and then cycle the voltage across the whole stack of layers in such a way that the lone electron and lone hole meet, mate, and make a lone photon. The resulting device, which operates at mK temperatures, is typically a tiny post some 700 nm tall and with a diameter of 200-1000 nm. (J. Kim et al., Nature, 11 February 1999.)

Anthony Mushrow

Alison Pentland wrote:

You can see higher frequencies than this. If you want to see something flickering try looking slightly to one side of it and 'watch' it out of the corner of your eye. It's your peripheral that can pick up fast movement or flicker. I believe it is a defence mechanism from when we had to watch out for predators sneaking up on us!

I noticed that just a few days ago with a TV. I thought it strange. At least now I know I'm not going insane and there's some explanation for it.

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Lost User

Ashley van Gerven wrote:

I know 60Hz on a CRT will give you a headache, but what's the general opinion of refresh rates on LCD? Is 60Hz doable?

Just get a carton of Coopers Sparkling Ale and drink while you use it and there will be no problem. Besides that, I have a Chimei 22" 1680 x 1050 and the Missus has a Chimei 19" 1400 x 900 and both run at 60Hz with no dramas.

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El Corazon

Ashley van Gerven wrote:

Is 60Hz doable?

yes it is doable, and if you have the right monitor.... 1920x1080 is doable at 120Hz as well.

Ashley van Gerven wrote:

I know 60Hz on a CRT will give you a headache

actually, this is right and wrong at the same time. For some, 60hz is a headache, for others 75Hz is. Generally, when one was a headache, before the LCDs entered the market, I would tell people to try the other. Declaring which was which for all people was bad. For a time they switched all monitors to 75hz to help reduce headaches, they simply switched who had the headache making one set happy and another unhappy. The only rule to human behavior is that all rules are "averages" there is someone, somewhere out there to break any rule. :-D

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