Zytronic Projected Capacitive X-Y controller Touchscreen Manuale Utente Scaricare il pdf (Pagina 3)

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2 Typical sensor integration guidelines

The Zytronic Projected Capacitive X-Y Controller Touchscreen can be integrated in two possible

ways depending on the final application requirement. The two possible integration methods are:

- Direct Touch Application – used for standard applications where an applied touch makes

direct contact with the front surface of the touchscreen

- Through Touch Application – used for through touch applications where the touchscreen is

placed behind a separate front piece of sacrificial glass or polycarbonate

Example 1 illustrates a Direct Touch integration with a typical front bezel which can be made

either from plastic or metal.

Example 2 illustrates a Through Touch integration with a front sacrificial glass and front bezel

which can be made either from plastic or metal.

Example 3 illustrates a Through Touch integration with a front sacrificial glass only.

2.1 Recommended metal bezel spacing and activation button placement

Note: For Through Touch application, placing two glass surfaces directly on top of each other

may cause an optical Newton Ring effect. This can be overcome by selecting a touchscreen

construction with an anti-glare front glass surface etch or by simply placing a small air gap of

less than 0.5 mm between the two affected surfaces.

Note: Maximum Through Touch application: If the base standard sensor front glass is 3 mm

thick an additional 6 mm of glass or 4 mm or polycarbonate can be placed directly in front of the

sensor (with no air gap between the surfaces) to maintain reliable operation. Any greater

thickness of overlay would need to be experimented with at the customers discretion and own

approvals.

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Zytronic Projected Capacitive X-Y controller Touchscreen Manuale Utente Pagina 3