Wincor Nixdorf BA72R, User Manual

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BA72R Components
13 BA72R LCD Display – Operating Manual 01750140683 F
Resistive Touch Screen (Option)
General
The resistive TFT Touch Screen is constructed of a hard-coated polyester top
sheet that is overlaid on a conductively coated glass layer. Voltage is applied to
the top sheet. As the user touches the screen, the top sheet compresses into
contact with the glass layer, and current flows to the four corners in proportion to
the distance from the edge. The controller then calculates the position of the
finger or stylus, based on the current flow. Because the controller derives both the
“X” and “Y” touch coordinates from the stable glass layer, the accuracy and
operation of the touch screen is unaffected by damage to the top sheet caused by
extended use or neglect.