Touch is becoming an important feature in most Graphics applications which require Human Machine Interface. Essentially there are two types of touch.

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• Resistive Touch

  • Consists of two layers with an air gap in-between.

  • When a stylus or finger presses down on the outer surface, the measure of resistance between the two surfaces at the point of contact leads to detection of touch position

  • Advantages:

    • Low production cost

    • High resistance to dust and water

    • Best used with finger or stylus or when there is no human contact (i.e. gloves)

 

• Capacitive Touch

  • Relay on sensing the conductivity from the skin on fingertip to the screen to determine the touch location

  • Advantages

    • Highly responsive compared to resistive touch

    • Supports multi-touch