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Interlacing is a video display technique that divides a full frame into two fields: one with odd lines and one with even lines. The odd lines are drawn first, followed by the even lines, creating a more complete image and reducing flicker with less bandwidth, a technique originally used for older broadcast television. While it was a good solution for its time, it can cause visual artifacts like "combing" on modern progressive displays like most LCDs and LEDs, which are designed to display every line at once.

How it works

Field 1 (Odd lines): The display first draws all the odd-numbered horizontal lines of the image.

Field 2 (Even lines): The display then draws all the even-numbered horizontal lines of the image.

Frame creation: Together, the two fields create a complete frame. Because they are drawn so quickly in succession (e.g., 60 fields per second on a 75 Hz display), the human eye perceives a single, complete image.