Frontally shielded capacitive touch sensor system
First Claim
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1. A frontally shielded capacitive touch sensor system, comprising:
- a capacitive touch sensor having a touch sensitive surface;
a front shield mounted in front of said touch sensor and extending peripherally about said surface surrounding an exposed accessible area of said touch sensitive surface;
means for providing a first voltage on said touch sensor and means for detecting a change in capacitance representative of a touch to said touch sensor and for providing a second voltage on said front shield for controlling the capacitance between said touch sensor and said front shield and shielding the system from stray capacitance occurring at said front shield.
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Abstract
A frontally shielded capacitive touch sensor system includes a capacitive touch sensor having a touch sensitive surface; a front shield mounted in front of the touch sensor and extending peripherally about the surface surrounding an exposed accessible area of the touch sensitive surface; a device for providing a first voltage on the touch sensor and detecting a change in capacitance representative of a touch to the touch sensor and for providing a second voltage on the front shield for controlling the capacitance between the touch sensor and the front shield and shielding the system from stray capacitance occurring at the front shield.
187 Citations
10 Claims
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1. A frontally shielded capacitive touch sensor system, comprising:
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a capacitive touch sensor having a touch sensitive surface; a front shield mounted in front of said touch sensor and extending peripherally about said surface surrounding an exposed accessible area of said touch sensitive surface; means for providing a first voltage on said touch sensor and means for detecting a change in capacitance representative of a touch to said touch sensor and for providing a second voltage on said front shield for controlling the capacitance between said touch sensor and said front shield and shielding the system from stray capacitance occurring at said front shield. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification