Front-end signal compensation
First Claim
1. A touch sensor panel for generating compensated touch signals, comprising:
- a plurality of first electrodes; and
a plurality of second electrodes;
wherein the plurality of second electrodes include one or more shielding portions configured for substantially covering an entirety of one or more of the plurality of first electrodes, resulting in the one or more of the plurality of first electrodes becoming touch-insensitive first electrodes.
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Accused Products
Abstract
A touch surface device having improved sensitivity and dynamic range is disclosed. In one embodiment, the touch surface device includes a touch-sensitive panel having at least one sense node for providing an output signal indicative of a touch or no-touch condition on the panel; a compensation circuit, coupled to the at least one sense node, for generating a compensation signal that when summed with the output signal removes an undesired portion of the output signal so as to generated a compensated output signal; and an amplifier having an inverting input coupled to the output of the compensation circuit and a non-inverting input coupled to a known reference voltage.
78 Citations
20 Claims
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1. A touch sensor panel for generating compensated touch signals, comprising:
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a plurality of first electrodes; and a plurality of second electrodes; wherein the plurality of second electrodes include one or more shielding portions configured for substantially covering an entirety of one or more of the plurality of first electrodes, resulting in the one or more of the plurality of first electrodes becoming touch-insensitive first electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for generating compensated touch signals, comprising:
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forming a plurality of first electrodes; forming a plurality of second electrodes; and substantially covering an entirety of one or more of the plurality of first electrodes with one or more shielding portions of the plurality of second electrodes, resulting in the one or more of the plurality of first electrodes becoming touch-insensitive first electrodes. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A touch sensor panel for generating compensated touch signals, comprising:
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a plurality of first electrodes; a plurality of second electrodes; and wherein the plurality of second electrodes includes one or more shielding portions for rendering one or more of the first electrodes touch-insensitive. - View Dependent Claims (19, 20)
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Specification