4-4 Theory of Operation
4.5 Display and Touch Screen
4.5.1 Color LCD Module – The display module is an NEC TFT (thin film transistor)
active matrix color liquid crystal display (LCD) module comprising amorphous
silicon TFT attached to each signal electrode, a driving circuit and a backlight.
The 22cm diagonal display area contains 800x600 pixels (SVGA) and can
display 262144 colors simultaneously.
4.5.2 Inverter – The inverter which supplies power to the TFT is supplied with +12V
from the DVI card DVO/DVI processor, it then converts this to 1000-2000V AC
to drive the TFT. The intensity control is kept at a constant 100%, dimming is
not possible.
4.5.3 Touch Screen – The touch screen is a 4 wire resistive touch screen. It must
be calibrated so that software can determine where a touch corresponds to a
position on the screen. This calibration is done at five points and can be
invoked through the Utilities menu.
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