Refresh Rate, in reference to video hardware, is the frequency with which the entire screen is redrawn to maintain a constant, flicker free image. On TV screens and raster-scan monitors, the electron beam that lights the phosphor coating on the inner surface of the screen typically refreshes the entire image area at a rate of about 60 hertz (Hz), or 60 times per second. Interlaced monitors, which redraw alternate lines during each sweep of the electron beam, actually refresh any particular line only 30 times per second. This is because odd and even lines are refreshed on successive sweeps, however, the effective refresh rate is still measured as 60 times per second.
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