User guide

CERTO 415/417
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14
Touchscreen
General
The TFT LCD flat panel display is an XGA-compatible 15-inch flat panel
display which is absolutely flicker free and low radiation. It is designed
for a resolution of 1024 x 768 pixel. Application programs should be
used with this resolution!
The screen module represents the main unit of the BA73A-2. It
comprises of a TFT-LCD colour screen, the TFT-interface and an
inverter that generates the voltage for backlighting the screen. As
an option the screens are available with Touch Screen including a
beeper.
Capacitive Touch Screen
The TFT Touch Screen works according to the principle of a change in
analogue capacitance. It has a glass screen with a transparent, thin-film
overlay on the surface. This is fully sealed and protected by a further
layer of clear glass. Electrodes on the edges of the screen provide an
uniform low-voltage field. As soon as you touch the screen with your
finger the contact point is “recognized” by the change in capacitance.
Because this takes place very quickly, the Touch Screen is optimally
equipped for a number of different requirements and applications.