Hardware Reference
In-Depth Information
Although LCD panels aren't affected by geometry errors as CRT monitors can be, they
can have their own set of image-quality problems, especially if they use the 15-pin analog
VGA video connector. Pixel jitter and pixel swim (in which adjacent pixels turn on and
off) are relatively common problems that occur when you are using an LCD monitor con-
nected to your PC with an analog VGA connector.
You can use the Auto-Tune option available in many LCD panels' OSDs to fix these and
other LCD display problems.
Bad Pixels
Aso-called
bad pixel
isoneinwhichthered,green,orbluesubpixelcellremainsperman-
ently on or off. Those that are permanently on are often called
stuck pixels
, whereas those
that are permanently off are called
dead pixels
. Failures in the on state seem to be more
common. In particular, pixels stuck on are noticeable on a dark background as tiny red,
green, or blue dots. Although even one of these can be distracting, manufacturers vary in
their warranty policies regarding how many bad pixels are required before you can get a
replacement display. Some vendors look at both the total number of bad pixels and their
locations. Fortunately,improvements inmanufacturing quality make it less andless likely
that you will see LCD screens with bad pixels.
