Advantech IDS-3115 Series, User Manual

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IDS-3115 User Manual 20
3.4 Mounting Notes (for Projected Capacitive
Touchscreen)
Projected Capacitive touchscreens detect the touch location by measuring the
increased amount of the capacitance value between its electrodes at inputs. Once it
is built into a system, capacitance couplings are continually yielded among the touch-
screen. When turned on, our projected capacitive touchscreen will automatically
adjust its sensitivity level to the surrounding environment in standby state in order to
avoid the affects by the surrounding capacitance couplings. If the surrounding envi-
ronment changes or the device is near materials that alter the electrical field (a large
capacitor, power-supply unit, LCD panel, or materials with high dielectric constant),
these external factors will adversely affect the function of the touchscreen to detect
the correct input positions.
Please refer to the mounting notes below and ensure enough gap among each com-
ponent in order to avoid trouble from the external factors described above.
3.4.1 Mounting Touchscreen on Back Side of the Bezel
Fix the touchscreen firmly so that the gap distances between the touchscreen and
other components will not be affected by touching or will not change with the passage
of time. An unexpected input may be caused if the gap is too narrow.
It is recommended to use an insulating resin material for the bezel. If a metal plate is
used for the bezel, unintended capacitance coupling may occur on the periphery of
the active area.
If a metal plate or any other metallic materials is used for the bezel, ensure a gap dis-
tance of approximately 2mm between the touchscreen and the bezel (L1)
3.4.2 Tail
The tail must not be forcibly stressed or bent too hard or it may cause conduction in
the insulated area and/or wire breaking..