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Noise Wars: Projected Capacitance Strikes Back | Cypress Semiconductor

Noise Wars: Projected Capacitance Strikes Back

Last Updated: 
Oct 08, 2013

Author: John Carey

Today’s users expect multitouch systems to perform with precision and still comply with demanding environmental standards. Designers face no small feat in meeting these requirements. With a rapidly changing internal environment in multitouch systems, the war for touchscreen dominance is effecting the emergence of new battlegrounds.

One current trend is the push toward thinner phones. Achieving this goal means direct lamination of capacitive-touch sensors to the display, moving the sensor inside the display, and overcoming many other challenges with antennas and ground loading. It is no longer acceptable to just throw a shield layer onto the sensor structure to block display noise. Such an approach adds too much cost and thickness.

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