Sunday, April 10, 2016

Explain left horizontal overscan and right horizontal overscan

Left horizontal overscan and Right horizontal overscan : 

In fig(a) and fig(b), the raster lines extend beyond the visible edge of the CRT. This is because there is a limit to how rapidly the sweep generator can alter the magnetic or electric field created by the deflection yoke. Further, as the deflection yoke changes the electrons beam's direction, it also tends to create annoying borders and distorts the picture.

In order to avoid-creating border and distortion the electron beam is allowed to run some distance beyond the viewable edge of the CRT. The overscan on the top is called top vertical overscan, overscan to the bottom vertical overscan, overscan to the left is called left horizontal overscan, and overscan to the right is called right horizontal overscan
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