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3
LCD Benefits in General
Free of Geometric Distortion
The"raw' scanning pattern of a CRT monitor is
such that a "pincushion'-shaped picture frame
would be displayed on the screen - as shown in
Figure 3-4 below. This is because today's CRTs
are made to be as flat as possible, while
technically, the best scanning characteristics
would result from a CRT screen with a curved
surface.
To compensate for this pincushion nature or
geometric discrepancy between the beam scan
and the screen's flatness, many technologies
have been developed to align the beam scan to
the CRT's rectangular screen. As shown in
Figure 3-4, the areas in the middle of the screen
must be expanded to fit the CRT screen. This
Figure 3-4. Pincushion shaped frame
Figure 3-5. Geometric Distortion
18
Product Information Manual Sony Professional LCD Monitors
naturally results in the picture content, especially
along the vertical edges of the screen, being
geometrically distorted. For example, circular
objects displayed in the corners of the screen will
tend to appear as oval-shaped objects, and
characters scrolled across the screen will look
wider near the screen edges compared to the
screen center.
In contrast, LCD displays use fixed pixels and
therefore do not have geometric distortion. This is
important when using the display as a monitor for
creating graphics, titles, and logos that will be
placed near the edges of a display.
Image area
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