What is the need of interlaced scanning?

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written 6.7 years ago by

teamques10 ★ 68k

In television pictures an effective rate of 50 vertical scans per second is utilized to reduce flicker.
This is accomplished by increasing the downward rate of travel of the scanning electron beam, so that every alternate line gets scanned instead of every successive line.
Then, when the beam reaches the bottom of the picture frame, it quickly returns to the top to scan those lines that were missed in the previous scanning.
Thus the total number of lines is divided into two groups called ‘fields’. Each field is scanned alternately. This method of scanning is known as interlaced scanning.
It reduces flicker to an acceptable level since the area of the screen is covered at twice the rate. This is like reading alternate lines of a page from top to bottom once and then going back to read the remaining lines down to the bottom.

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