Uniform threshold for capacitive sensing

Details Uniform threshold for capacitive sensing Uniform threshold for capacitive sensing

2007-06-22

2011-11-22

Luebke, Renee (Department: 2833)

Electricity: circuit makers and breakers

Capacitive switch

Reexamination Certificate

active

08063330

ABSTRACT:
The specification and drawings present a new apparatus and method for providing and using a uniform threshold for capacitive touch sensing in a user interface having a non-flat touch surface. The capacitive touch sensor can to provide a sensor signal using the uniform capacitance threshold level as a function of a location of an object (e.g., finger, stylus, etc.) on or near the non-flat touch surface of a user interface module using a substantially uniform distance between the non-flat touch surface and a capacitive touch sensor layer, and/or using a gradient of a dielectric constant of materials between the non-flat touch surface and the capacitive touch sensor layer according to a predetermined criterion.

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