Any laptops with >60Hz screen?

[Hammerli]

I suffer from migraines and need a laptop with a higher than 60Hz refresh rate. I just had to return an Apple Powerbook since it was worse than the couple of XP laptops I tried out at Best Buy. All the models at best buy had only 60 Hz in the pulldown, so essentially non adjustable. The Apple was the newest 15", and it was really bad. Am I just out of luck?

 

[Biren]

lol, you can't see the refresh rates on lcd screens... there's something else bugging you.

 

[CalvinHobbes]

I have two Dell flat panel monitors on Dell rack systems that allow changing the refresh rate. It goess up to 75Hz, anything higher and it will complain.

 

[Hammerli]

Originally posted by: Biren
lol, you can't see the refresh rates on lcd screens... there's something else bugging you.

Well, the refresh rate has a direct correlation to cyclic aura I experience. When I set the LCD on my desktop to 75 Hz, which it supports, I do not experience near the degree of optical disturbance I do when I set it to 60Hz. Based on that I'd say its the refresh rate that is bugging me. If I look at an LCD set to 60Hz for a couple of minutes and then close my eyes, I have what you would call flickering at the periphery of my eyes. This has happened with several manufacturers and so I do not believe it was a fluke. That is precisely what I've experienced with CRTs as well, so whether I can "see" it or not, it IS affecting me. Never underestimate what people with sensitive eyes can "see", I can tell a flourescent light is cyclic even though it's cycling at 120 Hz due to the sine wave, and I mean brand new ones, not those with bad ballasts.

 

[corkyg]

Latops have LCDs - LCDs don't have refresh rates. They do have response time - but that only really matters in games. LCD pixels are staring and not refreshed.

 

[The-Noid]

When changing the refresh rate on an LCD monitor you will not notice a difference as they are changing the refresh into its optimum resolution. I had a Toshiba 5205-S705 laptop that would go up to 180 hz which was the most the video card inside would support, but in actual properties it was still at 60 hz. This is the same as most monitors. Both my Samsung and Dell support 75 hz but when looking at what the monitor is actaully producing you will notice that it is still 60 hz. Your problem is more psychological then physical I believe. If you still think that the problem is physical buy the 5205-S705 and disregard the opening part of this comment

 

[aatf510]

The refresh rate on a CRT defines the no. times the monitor draw the image in a second, and therefore people get headaches looking @ CRTs with low refresh rates because the monitor doesn't draw fast enough to fool the human eyes that it is a still picture.
However, this is not the case with LCD because the image is always statcially sitting there, and only the pixel that needed to be changed changes. If you blame on LCD low refresh rate, blame on the fact your eyes have problem looking at static pictures.

 

[Phluxed]

Originally posted by: toattett
The refresh rate on a CRT defines the no. times the monitor draw the image in a second, and therefore people get headaches looking @ CRTs with low refresh rates because the monitor doesn't draw fast enough to fool the human eyes that it is a still picture.
However, this is not the case with LCD because the image is always statcially sitting there, and only the pixel that needed to be changed changes. If you blame on LCD low refresh rate, blame on the fact your eyes have problem looking at static pictures.

What he said.

 

[Lyfer]

Originally posted by: corkyg
Latops have LCDs - LCDs don't have refresh rates. They do have response time - but that only really matters in games. LCD pixels are staring and not refreshed.

What he said.

 

[Ronin]

Originally posted by: Lyfer

Originally posted by: corkyg
Latops have LCDs - LCDs don't have refresh rates. They do have response time - but that only really matters in games. LCD pixels are staring and not refreshed.

What he said.

Yeah

 

[Hammerli]

Originally posted by: Yoxxy
When changing the refresh rate on an LCD monitor you will not notice a difference as they are changing the refresh into its optimum resolution. I had a Toshiba 5205-S705 laptop that would go up to 180 hz which was the most the video card inside would support, but in actual properties it was still at 60 hz. This is the same as most monitors. Both my Samsung and Dell support 75 hz but when looking at what the monitor is actaully producing you will notice that it is still 60 hz. Your problem is more psychological then physical I believe. If you still think that the problem is physical buy the 5205-S705 and disregard the opening part of this comment

A LCD does have a refresh rate, just not in the same sense as a CRT. As defined by the refresh rate, when a change to a pixel is needed a different current is sent causing the "twist" to register a different appearance to the pixel, and in a typical LCD the polarity of the cell voltage is reversed alternately to avoid damging the cells. It is essentailly impossible to get the exact same voltage so there will be some degree of "flickering" at half of the frame rate. The generally flourescent back lighting can also exascerbate display anomolies. You seem to be referring to native response time as resolution, which aren't the same. So if a display has a response time of 12ms, that is roughly a 83 Hz refresh rate. If it is your contention that even set to 60Hz the display is actually running at 83Hz, that doesn't make sense. If the hardware is sending only 60 cycles, I doubt the display is able to interpolate values to fill in up to 83 Hz. Just like a DLP, some people have optical difficulties with LCD's. Just because you don't believe it doesn't mean it iusn't true. Maybe I should ask for response times for laptop displays so people will stop trying to tell me what I can and can't see and answer the question. Cyclic aura isn't physchologiocal, it is well documented and common at the onset of a migraine. I've had plenty of EEGs and other tests that have shown certain triggers; perhaps your physiology means all this is irrelevant, and if so lucky you, but don't dismiss it just because you aren't affected by it.

 

[The-Noid]

i know what a native response time is. And your theory that a 12 ms response time is 83 hz isnt exactly correct either. Becuase you are also saying that a montor with 2 ms response would be somewhere near 500 hz. As you are dividing 100 / 12 to get 83 hz. It would make sense that the monitor would need to be able to display 500 hz to be able to do this, but it is actaully the time it takes for a pixel to become enlightened and not. The monitor is still running at 60 hz but you have no ghosting with a monitor with 2 ms becuase the pixels are englighting themselves and changing contrast quicker then one with 12 ms. What I said is just becuase windows says you are at 180 hz or 75 hz doesn't mean the monitor is actaully supporting that. The monitor takes a max and that is what it displays. If you think that a response time will make a difference toshiba has the lowest with 8 ms. This is the situation I was in when I ran at 180 hz and said that it looked much better and no flicker at all. I was a bit embarassed when I realized the screen was running at 60 hz when windows said it was 180 hz. The mind is a very strong thing.

 

[Hammerli]

Since there is no standard with respect to refresh rates, and it is actually takes less time to turn a pixel from black to white rather than from one color to another, you are correct in your assertion that the refresh rate isn't necessarily indicative of performance. That is particularly true when dealing with overstated test tube numbers like those you refer to. Not all LCD monitors are fixed to 60 Hz as you seem to be claiming. That is a fact; I deal with smaller LCDs for a surgical environment and I've discussed LCD performance with other engineers from LCD manufacturers so I know that for certain. The mind is indeed very strong, but not strong enough to overcome facts sometimes. Thanks for your suggestions, perhaps I should talk to some manufacturers who have a better knowledge of their products.