DRIVEN SHIELD FOR CAPACITIVE TOUCHPADS
First Claim
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1. A method for shielding a portion of a capacitive sensor used in a touchpad, said method comprised of the steps of:
- 1) providing at least one drive electrode for generating a signal and at least one sense electrode for measuring a portion of the signal that is coupled to the at least one sense electrode; and
2) providing a driven shield electrode that is electrically coupled to the at least one sense electrode for receiving a modified signal from the at least one sense electrode, and wherein the driven shield electrode is disposed adjacent to the at least one sense electrode to thereby at least partially shield the at least one sense electrode from undesired electrical and capacitive signals.
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Accused Products
Abstract
A conductive shield that is disposed near the sensor, wherein a signal is driven on the shield that is similar to the signal induced on the sensor, thereby reducing stray capacitances and protecting the sensor from external noise sources, and resulting in a stronger signal reaching the sensor.
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Citations
21 Claims
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1. A method for shielding a portion of a capacitive sensor used in a touchpad, said method comprised of the steps of:
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1) providing at least one drive electrode for generating a signal and at least one sense electrode for measuring a portion of the signal that is coupled to the at least one sense electrode; and 2) providing a driven shield electrode that is electrically coupled to the at least one sense electrode for receiving a modified signal from the at least one sense electrode, and wherein the driven shield electrode is disposed adjacent to the at least one sense electrode to thereby at least partially shield the at least one sense electrode from undesired electrical and capacitive signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for shielding a capacitive sensor used in a touchpad, said system comprised of:
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at least one drive electrode and means for generating a signal thereon; at least one sense electrode and means for measuring a portion of the signal that is coupled to the at least one sense electrode; and a driven shield electrode that is electrically coupled to the at least one sense electrode for receiving a modified signal from the at least one sense electrode, and wherein the driven shield electrode is disposed adjacent to the at least one sense electrode to thereby at least partially shield the at least one sense electrode from undesired electrical and capacitive signals. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A system for shielding a capacitive sensor used in a touchpad, said system comprised of:
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at least one drive electrode and means for generating a signal thereon; at least one sense electrode and means for measuring a portion of the signal that is coupled to the at least one sense electrode; a driven shield electrode; a driven shield substrate, wherein the driven shield electrode and the driven shield substrate are electrically coupled to the at least one sense electrode for receiving a modified signal from the at least one sense electrode, wherein the at least one drive electrode, the at least one sense electrode and the driven shield electrode are coupled to the driven shield substrate, and wherein the driven shield electrode and the driven shield substrate are disposed adjacent to the at least one sense electrode to thereby at least partially shield the at least one sense electrode from undesired electrical and capacitive signals. - View Dependent Claims (18, 19)
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20. A system for shielding a capacitive sensor used in a touchpad, said system comprised of:
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at least one drive electrode and means for generating a signal thereon; at least one sense electrode and means for measuring a portion of the signal that is coupled to the at least one sense electrode; and a driven shield substrate, wherein the at least one sense electrode and the at least one drive electrode are attached to the driven shield substrate, and wherein the driven shield substrate is electrically coupled to the at least one sense electrode for receiving a modified signal from the at least one sense electrode to thereby at least partially shield the at least one sense electrode from undesired electrical and capacitive signals. - View Dependent Claims (21)
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Specification