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Refresh rate
The refresh rate defines how often the entire image is refreshed on the screen per second. Due to the sluggishness of the human eye and the slight backlighting of the screen, the user takes the structure of the monitor image is no longer true from a certain refresh rate. So he gets the impression of a still image. So that no flickering is visible on the screen, according to TÃœV, the refresh rate should be at least be 75 Hz.
However, this value also varies from person to person, because some people feel it Image only flicker-free from 85 Hz and others already at 70 Hz. For this purpose, the electron beam has to scan the image line at 768 lines (1024 X 768 resolution) 768 X 75 = 57600 times per second switch. The resulting required horizontal frequency or line frequency is 58 kHz.
