Explanation on Moiré patterns: Dell™ M782p Color Monitor User's Guide
Explanation on moiré
patterns in CRT monitors.
Computer monitors sometimes show wavy or elliptical patterns
in certain areas of the screen.
Figure 1 shows an example of Windows®
Desktop with some moiré.
This is not caused
by a circuit failure; it is the result of a natural interference phenomena between
scan line patterns and the CRT phosphor trio dots.
The intensity of the wavy moiré pattern
depends on various parameters:
CRT dot pitch, spot size, selected video
resolution, screen size and brightness.
CRT dot pitch and spot size are optimized for screen performance.
Unfortunately, a sharper picture will also lead to more intense moiré patterns.
The user
can reduce moiré patterns by choosing different video resolution (higher or
lower), or make some adjustments in screen size.
Increasing contrast and brightness settings
will also reduce moiré.
Figure 2 shows the Windows® menu
for changing video resolution.
Consult your Windows® User's Guide
for more details on changing video resolution.
The M782p has a Moiré cancellation
function which can be adjusted to reduce the Moiré patterns.
Moiré cancellation can be adjusted in horizontal and vertical
direction. It should be noted that the adjustment will slightly deteriorate
picture sharpness: Horizontal moiré adjustment will widen the vertical lines,
while vertical moiré adjustment will widen horizontal lines. In most cases,
adjusting vertical moiré will be sufficient. Optimum settings lie within the
20 ~ 50% range. It is recommended not to exceed the 50% range.
