Sharp PG-M20XL Manual do Utilizador descarregar pdf (Página 28)

Resistive Touch Screen (Option)

General

The resistive TFT Touch Screen is constructed of a hard-coated polyester

topsheet that is overlaid on a conductively-coated glass layer. Voltage is

applied to the topsheet. As the user touches the screen, the topsheet com-

presses into contact with the glass layer, and current flows to the four cor-

ners 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 topsheet caused by extended use

or neglect.

GB - 21

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Sharp PG-M20XL Manual do Utilizador Página 28