3-36 Operation and Cleaning
Resistive Touch Screen
The resistive TFT touch screen is constructed of a hard-coated polyester top sheet that is
overlaid on a conductive-coated glass layer. Voltage is applied to the top sheet. As a user
touches the screen, the top sheet compresses and comes into contact with the glass
layer, causing current to flow to the four corners in proportion to the distance from the
edge. Ths controller then calculates the position of the finger, based on the current flow.
Because the controller derives both the "X" and "Y" touch coordinates from the stable
glass layer, ther accuracy and operation of the touch screen is unaffected by any damage
that may have occured to the top sheet.
Using the Resistive Touch Screen
The resistive touch screen functions as traditional single-touch screens.
Touch Screen Cleaning Procedures
1. Using a soft cloth dampened with isopropyl alcohol or a mild non-abrasive soap &
water solution, gently wipe the touch screen clean.
2. Wipe the screen and edges dry.
3. Make sure the glass and screen edges dry completely before using the unit.
4. Do not use sharp objects to clean around the edges of the touch screen.
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