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3.5 Adjusting Displays in a Video Wall
If you only have one display, you can skip this section (3.5) and all its subsections. If you have more
than one display, these sections will help you make the video wall look like a single unit, rather than
a lot of separate pieces.
To make a group of adjacent displays look like a
single, large display you have to do at least four
things:
1. Mount the display units close together,
aligning them physically. They should be
as close as possible to each other and
square with each other.
2. Fill the wall with one image. This is
sometimes accomplished with an external
video processor. Clarity's Big Picture™
does this with a built-in processor.
3. Adjust the position and size of the image.
These are minor adjustments done after
Big Picture (or an external processor) has
spread a single image over all the displays.
4. Make the colors match from one unit to
the next. This is called Color Balancing. It
is not necessary to match each individual
color. You only have to match the units
for white and for gray. When the whites
and grays match, the rest of the colors will
match. It is also not necessary that the
white be a perfect white. The White Pages
of a telephone book are a long way from
white, but they are certainly white com-
pared to the Yellow Pages.
The SN-4215-P has very wide mullions. The
mullion is the material that surrounds the glass
display panel and holds it in place.
In a video wall, it is necessary to hide some
pixels behind these mullions. In the next
illustration, you see two displays with one
picture spread over both. This simple picture is
a single diagonal line with no pixels hidden
3 - 28
behind the mullions.
Mullion
Diagonal line shown on two displays,
no pixels hidden behind mullions
Notice that the diagonal line does not appear
straight. It looks like two separate lines.
Compare this with the picture below:
Diagonal line shown on two displays
with several pixels "hidden" behind mullions
Here, the line looks like a single line
"covered" by the mullions. This is the sort of
thing our eyes expect to see when we look at
something through several windows.
Clarity's Big Picture automatically hides the
proper number of pixels behind each interior
mullion, making the whole picture look right. In
some cases, a minor amount of adjusting with
Position and Zoom may be necessary.
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