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If you were to accept the same error rate as in the case of the strip mask, for which two horizontal
lines are completely disrupted, then you would end up with a 2.6 percent error rate. The accepted
error rates for LC displays are far lower, however. If, for example, you were to accept a tolerance of
three permitted pixel errors per display, the you would end up with an error rate of 0.0038 per thou-
sand.
B
Blurred image
.
You can also end up with blurred images with LC displays indeed whenever you depart from the
native resolution. A display is built for a set resolution, smaller resolutions can only be displayed
interpolated. If, for example, you want to display a resolution of 800x600 on a display with a native
resolution of 1024x768, then each horizontal dot would have to display 1.28 dots of the resolution.
This doesn't work of course and so intermediate values are calculated and this distorts the original
image.
C. Multifrequency as opposed to Multiscan
LC displays require a digital control and because currently there is still no valid standard for a digital
control, for the sake of compatibility there is a tendency to revert to the standard VGA connection.
This is also ideal for monitors, as they require an analog signal.
The image digitally created in the computer is converted in the graphics card into an analog signal
and thus directly controls a CRT monitor. If, however, you use the analog signal of the VGA connec-
tion for a digital LC display, then transducer electronics at the input of the display must cater for
conversion back into digital signals. Two problems occur with this:
1. conversion losses:
The image is not so optimal as compared with direct, digital control. It can otherwise be the
case that subsequent adjustments are necessary every couple of months on a regular basis.
This is generally executed via the OSD or an automatic function)
2. Limitation to specific operating modes:
Nowadays A CRT monitor is usually a multiscan monitor, which means it can be operated
within the limits of its horizontal and vertical frequency, even in non-standard modes. An
LCD monitor, in contrast, is a multi-frequency monitor, which means it is only guaranteed
to work together with specific modes (see list in the user's guide).
Acer LCD Color Monitor User's Guide
English 45
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