Specifications

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Resistive Overlay Advantages
n Resolution - Resistive overlay
touch systems can deliver resolution of up to
4096 x 4096 touch points.
n Stylus Requirements - Resistive
overlay touch systems have no stylus
limitations.
n Flexibility - Resistive overlay
sensors are adaptable to a wide range of
displays without expensive custom designs.
n Sealability - Resistive overlay touch
systems can be sealed to NEMA 4
requirements, preventing water and dirt from
penetrating the display’s internal electronics.
Resistive Overlay Disadvantages
n Transmissivity - Resistive overlay
touch systems have a transmissivity of 55%
to 78% due to multiple layers of different
materials found in the resistive overlay
sensor. They are also more susceptible to
glare and reflection than any other touch
technology. This can adversely affect image
quality, particularly for high resolution video
modes.
n Sensor Drift/Calibration - Resistive
overlay touch systems are subject to drift,
where the touch active zones move from the
graphic targets representing them. Periodic
calibration is required.
n Integration - Resistive overlay
touch systems typically require an invasive
integration to maximize the optical quality of
the display and to reduce the chance of
breaking the glass overlay. This invasive
integration requires disassembly of the
display and (optionally) permanent optical
bonding of the sensor to the display.
n Environmental Resistance -
Resistive overlay sensors are a type of
mechanical switch, and will wear out after
extended use due to a breakdown of the
separation layer. The exposed polyester top
layer is susceptible to cuts, scratches, and
abrasions. Chemicals that attack polyester
must be avoided. Also, the glass overlay is
susceptible to breakage.