405.1200.037.2 - Rel.: 2.21 of 25/02/2008
E-1
Essential information
The VT is a device composed of a series of components which, given their
structure MUST be used in a particular way; in addition, these very struc-
tural characteristics may cause the VT to behave in ways that could be
interpreted as a malfunctioning of product and/or evidence of a construc-
tional defect.
The VT in such cases is NOT to be considered faulty and so nei-
ther repair nor substitution are appropriate.
The component that generally creates this impression is the display. The
displays used on the VTs are of two distinct types, one with a passive
matrix called STN (Super Twist Nematic) and the other with an active
matrix called TFT (Thin Film Transistor). Some of their working features
are the same, others depend on the different constructional technology.
One component that requires particular care when being used is the Touch
Screen.
Below we set out a series of points relating to possible behaviors and the
correct use of the VT.
Failure to put some of these notions into practice may damage the
VT.
Graphic
terminals
The category graphic terminals covers both touch screen and keyboard ter-
minals and includes both those with STN display and those with TFT dis-
play.
• With CCFL backlit displays the brightness may be slightly uneven, the
areas where the CCFL lamps are may be lighter.
CCFL lamps
CCFL lamps
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