1-3
The IntelliTouch Contr oller
The IntelliTouch controller provides the drive signal for the touchscreen,
converts the received analog signals into digital touch coordinates, and sends
these coordinates to the computer.
The controller detects touches by comparing received signals to a reference
waveform acquired when the touchscreen is in an untouched condition. The
IntelliTouch controller detects dirt, dust particles, scratches and other
contaminants on the screen and “learns around” them. It incorporates those
signals into the reference waveform to ignore the contaminants. If the
contamination is removed, the controller relearns the reference signal.
Figure 1.2
IntelliTouch controller
Because of the stability of the IntelliTouch system, video realignment is not
necessary unless the position of the video image changes.
Resolution of the IntelliTouch system is defined by the controller and is
typically 4096 x 4096, with the controller transmitting at a rate of 48
coordinates per second during a touch.
The controller performs advanced internal diagnostics as well as touchscreen
diagnostics. The diagnostic results are obtainable through software as well as a
diagnostic LED. USB and serial controllers are available.