Where's my Refresh Rate?
kutto:
What does Refresh Rate mean exactly? ???
Gwill:
Quote from: kutto on 2006 September 07, 21:39:01
What does Refresh Rate mean exactly? ???
Short verion? It's like frames per second (althoug it isn't actually frames on a computer screen). The higher it is the smoother the image, and the less strain on your eyes.
KittKitt:
It's the number of times per second that a given "on" pixel (not black) will fire another shot of light at the screen.
If you're running at 75 hertz, then every static (non-moving) pixel will be re-lit 75 times per second. 60 hertz is 60 times a second and so on.
The faster this happens, the less flicker is able to be seen by the human eye. Some people are more prone to headaches than others as the refresh rate drops too low (normally below 60, but lots have issues at anything under about 75), but hardware can only sustain certain rates at certain resolutions, so compromises sometimes have to be struck.
It also doesn't apply to LCD displays. They have timings, but it's not really the same since once a pixel is "lit" on an LCD, it opens a constant stream to that point until it's told to change the color or turn it off entirely.
Note not to confuse this with 'frame rate', which has to do with moving pixels (which of course, don't *really* move, but rather one is turned off and one nearby is turned on in its place).
More.
-Kitt
J. M. Pescado:
Quote from: KittKitt on 2006 September 07, 21:45:35
The faster this happens, the less flicker is able to be seen by the human eye. Some people are more prone to headaches than others as the refresh rate drops too low (normally below 60, but lots have issues at anything under about 75), but hardware can only sustain certain rates at certain resolutions, so compromises sometimes have to be struck.
I've always firmly believed that to be nonsense, and people only see "flicker" because people like you keep telling them they should be seeing flicker. It's rubbish, since your computer can only put out maybe 20-30 FPS most of the time anyway, so your image would only change about 20-30 times a second. TV only puts out about 20-some frames a second, and no one complains about that.
dizzy:
Put a PAL monitor (50Hz) next to an NTSC (60Hz) and you will see the difference.
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