BLANKING RETRACE PERIOD
The period when the screen is darkened, which occurs when the electron ray in a monitor or a TV set retraces to start a new line or a new field. The instantaneous amplitude of that signal is such that it makes the return trace invisible. The blanking period is used to eliminate the appearance of the CRT retrace beam so it will not be visible on the monitor. Switching done during the retrace period results in ''clean switching''. (See Vertical Interval Switching.)
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