Figure 2-1. Intellitouch Touchscreen - Elo TouchSystems IntelliTouch Ultra Product Manual

Figure 2-1. IntelliTouch Touchscreen

Figure 2-1. IntelliTouch Touchscreen
Once X, Y, and Z coordinates have been determined, the controller transmits them Once X, Y, and Z coordinates have been determined, the controller transmits them
to the computer. to the computer.
The controller detects touches by comparing received signals to a reference The controller detects touches by comparing received signals to a reference
waveform acquired in an untouched condition. This allows the controller to ignore waveform acquired in an untouched condition. This allows the controller to ignore
contamination such as dirt and scratches. IntelliTouch Ultra controllers contamination such as dirt and scratches. IntelliTouch Ultra controllers
instantaneously detect and factor out contamination. Original IntelliTouch instantaneously detect and factor out contamination. Original IntelliTouch
controllers will detect and eliminate contamination when a "touch" appears controllers will detect and eliminate contamination when a "touch" appears
stationary for about thirty seconds. stationary for about thirty seconds.
In any event, a new reference waveform is then acquired, effectively ignoring the In any event, a new reference waveform is then acquired, effectively ignoring the
contamination and returning the touchscreen to normal operation. If the contamination and returning the touchscreen to normal operation. If the
contamination is removed, the controller repeats the process of acquiring a new contamination is removed, the controller repeats the process of acquiring a new
reference waveform. reference waveform.
The X and Y values are similar to Cartesian coordinates, with X increasing from The X and Y values are similar to Cartesian coordinates, with X increasing from
left to right and Y increasing from bottom to top. Z increases with touch pressure. left to right and Y increasing from bottom to top. Z increases with touch pressure.
These These coordinates are arbitrary and unscaled, and will vary slightly from coordinates are arbitrary and unscaled, and will vary slightly from
absolute absolute
unit to unit. Any coordinate normalization or scaling must be done at the driver unit to unit. Any coordinate normalization or scaling must be done at the driver
level, and calibration to the display image must be performed for each unit. level, and calibration to the display image must be performed for each unit.
Because of the stability of the IntelliTouch system, recalibration is not necessary Because of the stability of the IntelliTouch system, recalibration is not necessary
unless the position of the image changes. unless the position of the image changes.
The IntelliTouch Touchscreen The IntelliTouch Touchscreen
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