Screen
Savers: Until recently, most computer screens
depended on cathode ray tubes (CRTs). CRT images
are generated using electron beams which are
"launched" from the back of the monitor
and "draw" images continuously on
the screen. Most computer programs paint images
in the screen. Some of these images (letters,
pictures, animations, menus) are usually moving
or changing, and never stay in the same place
for long. But some portions of the screen (like
the Start bar in Microsoft Windows, or the typical
upper "score" bar of some video games)
are always in the same place, sometimes for
hours or even days or months.
Particularly with older CRTs, these sorts of
images, continuously drawn in the same place
for a long time, could damage the screen because
the electron rays always hit the same points
on the screen. Damage would consist of poor
image quality, and those fixed images could
remain "burned in" to the same place
like "ghost lines" even if the image
eventually changed. |
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