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Capacitive keyboard
Capacitive keyboard
Capacitive keyboards guarantee a modern appearance and reliable operation at the same time. Capacitive sensors can be attached to the front panel by printing directly the sensors onto the substrate or by subsequent lamination. The panel can be made of glass, polycarbonate, plexiglass or other electrically non-conductive material. A completely waterproof, vandal-proof keyboard can be easily and cost-effectively designed with this technology. Capacitive keyboards can be partially or completely transparent, or can be illuminated.
The output signal of the keyboard is a capacitance change, which can be decoded with appropriate electronics.
General structures
One of the most common designs is that the design front panel and the capacitive sensor foil are laminated together.
Another common capacitive keyboard solution is to print the sensors directly to the design substrate (it can be glass, plexiglass, foil, etc.).
How does it work?
In an electrode solution, a capacitance change occurs between the electrode and the ground when we approach or touch the surface.
In a two-electrode solution, a capacitance change occurs between the two electrodes when we approach or touch the surface.
In both cases, the capacitive sensor electronics must detect the largest capacitance change (outside the limit value), thus excluding environmental effects, scatter, and other errors.
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