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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.
Refresh rate has greater effects on CRT monitors, while flicker is less noticeable on LCD monitors.
This article was originally based on material from the Free On-line Dictionary of Computing, which is used under the GFDL.