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10
Selecting a Monitor Size
Table 10.1 shows the monitor’s advertised diagonal screen size,
along with the approximate diagonal measure of the actual active
viewing area for the most common display sizes.
Chapter 10
Video and Audio
Table 10.1
Monitor CRT
Advertised Screen Size Versus Actual Viewing Area
Size (in Inches) Actual Viewing Area (in Inches)
12 10 1/2
14 12 1/2
15 13 1/2
16 14 1/2
17 15 1/2
18 16 1/2
19 17 1/2
20 18 1/2
21 19 1/2
The size of the actual viewable area varies from manufacturer to
manufacturer but tends to be approximately 1 1/2 inches less than
the actual screen size. However, you can adjust some monitors—
such as some models made by NEC, for example—to display a
high-quality image that completely fills the tube from edge to edge.
Other makes can fill the screen also, but some of them do so only
by pushing the monitor beyond its comfortable limits. The result is
a distorted image that is worse than the monitor’s smaller, properly
adjusted picture.
This phenomenon is a well-known monitor-purchasing issue, and
as a result, most manufacturers and vendors have begun advertising
the size of the active viewing area of their monitors along with the
screen size. This makes it easier for consumers to compare what
they are paying for.