The refresh rate (or "vertical refresh rate", "vertical scan rate" for
CRTs) is the number of times in a second that a display is illuminated. This is distinct from the measure of
frame rate in that the refresh rate includes the repeated illumination of identical frames, while frame rate measures how often a display can change from one image to another.
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<
hardware> (Or "vertical refresh rate", "vertical scan rate") The maximum number of
frames that can be displayed on a
monitor in a second, expressed in
Hertz.
The scan rate is controlled by the vertical sync signal generated by the
video controller, ordering the monitor to position the
electron gun at the upper left corner of the
raster, ready to paint another frame. It is limited by the monitor's maximum
horizontal scan rate and the
resolution, since higher resolution means more
scan lines. Increasing the refresh rate decreases flickering, reducing eye strain, but few people notice any change above 60-72 Hz.
(1999-08-01)
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