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Flexible Screen CRT Touch Panel With Preloaded Piezoelectric Sensors Disclosure Number: IPCOM000062657D
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09

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Callaway, MB Droge, DA Papendick, JH [+details]


In a CRT Touch Panel, a flexible touch screen, together with preloaded piezoelectric sensors, provides more consistent sensor output, improving touch panel resolution. Design details of this embodiment provide additional improvements over current technology. It is known that the output of a piezoelectric crystal (PZT) is more consistent and predictable when it is preloaded by a controlled constant force. It is also known that a PZT responds to the rate of change of the applied input force (i.e., the output signal is the differential of the input force). Therefore, an abrupt reduction, or cut- off of the input force at a predicted point, limits the peak of the PZT output signal to a defined range.