Hz in TFT displays
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Hello all, I'm thinking on buying three high end displays for the guys in the technical department, I'm thinking on those from HP: http://h10010.www1.hp.com/wwpc/es/es/sm/WF25a/20587-156243-156243-156243-172205-12401680.html[^]. I've seen that the maximum resolution is 1920x1200 @60 Hz and I would like to know how do the Hz affect to a TFT display, as my laptop (for example) is great looking and it runs at 60Hz. Do you think that it is in the same way than before and that it will tire their eyes if they must work at 60Hz? Thank you in advance.
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Hello all, I'm thinking on buying three high end displays for the guys in the technical department, I'm thinking on those from HP: http://h10010.www1.hp.com/wwpc/es/es/sm/WF25a/20587-156243-156243-156243-172205-12401680.html[^]. I've seen that the maximum resolution is 1920x1200 @60 Hz and I would like to know how do the Hz affect to a TFT display, as my laptop (for example) is great looking and it runs at 60Hz. Do you think that it is in the same way than before and that it will tire their eyes if they must work at 60Hz? Thank you in advance.
Hertz is meaningless for LCDs because an LCD screen isn't constantly redrawn like a CRT is. One of the specs to look at to determine an LCD's display quality is the black-to-white or gray-to-gray time, measured in ms (smaller is better). That tells you how fast an individual pixel can change from one color to another.
--Mike-- Visual C++ MVP :cool: LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ
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Hello all, I'm thinking on buying three high end displays for the guys in the technical department, I'm thinking on those from HP: http://h10010.www1.hp.com/wwpc/es/es/sm/WF25a/20587-156243-156243-156243-172205-12401680.html[^]. I've seen that the maximum resolution is 1920x1200 @60 Hz and I would like to know how do the Hz affect to a TFT display, as my laptop (for example) is great looking and it runs at 60Hz. Do you think that it is in the same way than before and that it will tire their eyes if they must work at 60Hz? Thank you in advance.
Hz doesn't say anything about an LCD, because all the pixels are on all the time, so you don't get the tiring effect. Some qualities to check for: * Response time (in ms): how fast 1 pixel can change from black to white. I think anything lower than or equal to 16ms should be enough for working. * Contrast ratio: the difference between black and white. For lower end panels around 300:1, I think. * Light: measured in Lumens, this is the amount of light it gives off. Hope this helps
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Hertz is meaningless for LCDs because an LCD screen isn't constantly redrawn like a CRT is. One of the specs to look at to determine an LCD's display quality is the black-to-white or gray-to-gray time, measured in ms (smaller is better). That tells you how fast an individual pixel can change from one color to another.
--Mike-- Visual C++ MVP :cool: LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ
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Hello all, I'm thinking on buying three high end displays for the guys in the technical department, I'm thinking on those from HP: http://h10010.www1.hp.com/wwpc/es/es/sm/WF25a/20587-156243-156243-156243-172205-12401680.html[^]. I've seen that the maximum resolution is 1920x1200 @60 Hz and I would like to know how do the Hz affect to a TFT display, as my laptop (for example) is great looking and it runs at 60Hz. Do you think that it is in the same way than before and that it will tire their eyes if they must work at 60Hz? Thank you in advance.
It's not completely irrelevant, because it does affect how often the graphics card sends a new frame to the display and therefore what the peak frame rate the card can display will be (assuming frames are synchronized with the vertical sync signal, which they normally are). If your display is actually capable of a faster refresh then it might be worth doing it. My 1280x1024 19" Viewsonic VP191b supports 75Hz as well as 60Hz; it has a claimed response time of 8ms, which is better than the 13ms required to get any benefit from 75Hz. However, when Tom's Hardware measured it (link[^]) they found that the time to go from black to white and back again was more like 15-16ms.
Stability. What an interesting concept. -- Chris Maunder
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Hello all, I'm thinking on buying three high end displays for the guys in the technical department, I'm thinking on those from HP: http://h10010.www1.hp.com/wwpc/es/es/sm/WF25a/20587-156243-156243-156243-172205-12401680.html[^]. I've seen that the maximum resolution is 1920x1200 @60 Hz and I would like to know how do the Hz affect to a TFT display, as my laptop (for example) is great looking and it runs at 60Hz. Do you think that it is in the same way than before and that it will tire their eyes if they must work at 60Hz? Thank you in advance.
Joan Murt wrote:
tire their eyes if they must work at 60Hz
We make all of our employees run at 75 Hz. They complained a lot at first, but they're all in really great shape now. HR is considering calling it a Health Benefit and reducing wages to compensate for the value received. But seriously, the refresh rate is a measure of the amount of flicker perceived ( consciously or not ) by the user. A higher rate should actually reduce eyestrain, but 60 Hz has been found to be perfectly acceptable.
"...a photo album is like Life, but flat and stuck to pages." - Shog9
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Joan Murt wrote:
tire their eyes if they must work at 60Hz
We make all of our employees run at 75 Hz. They complained a lot at first, but they're all in really great shape now. HR is considering calling it a Health Benefit and reducing wages to compensate for the value received. But seriously, the refresh rate is a measure of the amount of flicker perceived ( consciously or not ) by the user. A higher rate should actually reduce eyestrain, but 60 Hz has been found to be perfectly acceptable.
"...a photo album is like Life, but flat and stuck to pages." - Shog9
Roger Wright wrote:
We make all of our employees run at 75 Hz. They complained a lot at first, but they're all in really great shape now. HR is considering calling it a Health Benefit and reducing wages to compensate for the value received.
IS can have my 60hz display setting when they pry it out of my cold dead hands. That or they can give me a monitor that supports resolutions of at least 1600x1200 with >60hz at the highest one the hardware will support.
Roger Wright wrote:
But seriously, the refresh rate is a measure of the amount of flicker perceived ( consciously or not ) by the user. A higher rate should actually reduce eyestrain, but 60 Hz has been found to be perfectly acceptable.
This is very subjective, I've been using 60hz displays for maximum resolution for most of my life. I'm at a point where financially I could afford a CRT that does better but my home desk won't do multiple monitors and the way LCD prices are freefalling until my 17" antique drops dead I'm waiting for another 50% price drop on the god level displays (2x24" 1920x1200 or 1x30" 2560x1600, eventually flanked by 2x 1200x1600 displays as additional budget permits). If the CRT were to die today, I'd probably get the first 1600x1200 now since it's my preferred overall setup I don't think I've room for the 24" model without buying a new desk first.
-- Rules of thumb should not be taken for the whole hand.
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Hertz is meaningless for LCDs because an LCD screen isn't constantly redrawn like a CRT is. One of the specs to look at to determine an LCD's display quality is the black-to-white or gray-to-gray time, measured in ms (smaller is better). That tells you how fast an individual pixel can change from one color to another.
--Mike-- Visual C++ MVP :cool: LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ
It's not irrelevant at all. Especially in terms of incandescent / fluorescent light flicker and digital tv / video frame dropping. But before getting into a 60 vs 75 Hz debate you need to sort out whether the user is in a 50 or 60 Hz country ( In terms of ac power and by extension TV signaling rates ). In general in a 60 Hz NTSC / ATSC country stay with 60 Hz and in a 50 Hz PAL / DVB-T country 75 Hz is the better compromise. Although I intend to stay with CRT technology at @100 Hz until better LCD (or xyz) technologies come along.