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varies with the inlet angle of the light, the viewing angle of a TFT is much narrower
than that of a CRT. Usually, the viewing angle refers to the point where the contrast
ration is 10. Many ways to widen the viewing angle are currently being developed and
the most common approach is to use a wide viewing angle film, which widens the
viewing angle by varying the refraction ratio. IPS (In Plane Switching) or MVA (Multi
Vertical Aligned) is also used to give a wider viewing angle.
Q: Why is there no flicker on an LCD Monitor?
A: Technically speaking, LCDs do flicker, but the cause of the phenomenon is
different from that of a CRT monitor -- and it has no impact of the ease of viewing.
Flickering in an LCD monitor relates to usually undetectable luminance caused by the
difference between positive and negative voltage. On the other hand, CRT flickering
that can irritate the human eye occurs when the on/off action of the fluorescent object
becomes visible. Since the reaction speed of liquid crystal in an LCD panel is much
slower, this troublesome form of flickering is not present in an LCD display.
Q: Why is an LCD monitor virtually low of Electro Magnetic Interference?
A: Unlike a CRT, an LCD monitor does not have key parts that generate Electro
Magnetic Interference, especially magnetic fields. Also, since an LCD display utilizes
relatively low power, its power supply is extremely quiet.
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Ergonomics, Ecology and Safety Standards
Q:
What is the CE mark?
A: The CE (Conformité Européenne) mark is required to be displayed on all regulated
products offered for sale on the European market. This 'CE' mark means that a
product complies with the relevant European Directive. A European Directive is a
European 'Law' that relates to health, safety, environment and consumer protection,
much the same as the U.S. National Electrical Code and UL Standards.
Q: Does the LCD monitor conform to general safety standards?