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ITO touch-screens are an interactive input device integrated onto
electronic displays. The touch screen consists of two conductive
layers. The top layer is ITO film while the bottom layer can be either
ITO film or ITO glass. The top layer is suspended by very small spacer
dots. When the operator touches the touch panel, the conductive inner
surface of the ITO film makes contact with the conductive coating on
the top surface of ITO film (or ITO glass). The coordinate X axis of the
touch point can be detected by measuring the voltage value though
the top ITO layers electrode. Y axis work similar way. Then an external
controller senses the touch panel and passes the information to the
corresponded IC. |
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Standard 8-Wire-Resistive Touch-Panels are available in different
sizes (8.4”…21.0”) |
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8-Wire-Resistive Touch-Panels are the most preferred solution for
applications requiring accuracy and no re-calibration over time. It is designed based on the 4-Wire-Resistive technology with edge providing
one more sensing line as a stable voltage gradient for the touch screen
controller. The functionality of additional four lines is to obtain the
actual voltage generated by the driving voltage, so the touch screen
controller can automatically correct the drift issue resulted from the
harsh environment exposure or long time usage. |
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