A scanning technique used in cathode-ray tubes in which the electron gun scans a line with each vertical passage as well as with each horizontal passage. Or, essentially, the gun constructs an image with two separate fields. Usually, the gun draws first the even-numbered lines, then draws the odd-numbered lines, each set of lines being considered a field. Interlacing is used on television sets, but rarely on computer monitors with a resolution less than 1024 x 768 pixels. Screens that are interlaced tend to produce a flicker (called interlace flicker) whereas a non-interlaced screens tend to have a more settled image. Also known as interlaced scanning.

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