Air gap

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To assemble the glass with the Touch Sensor on an LCD a suitable double-sided bonding tape should be applied around the perimeter of the LCD such as 3MVHB tape.

This assembly procedure creates an air gap between the LCD and the Touch Sensor. This air gap is necessary to reduce electromagnetic interference from the LCD panel, this interference differs depending on the LCD panel characteristics. The air gap may vary between 1 and 10 mm and should be as small as possible once there is no noise visible in the touch signal. We recommend using an air gap of at least 2 mm. In all cases, this should be checked before the final integration (i.e. test different airgaps by introducing a temporary object, like a non-adhesive foam or cork spacers on the LCD bezel, to adjust the distance between the LCD and the touch sensor laminated on glass, and test the touch performance).