Front-end signal compensation
AssigneeApple Inc.
InventorsSteve Porter Hotelling, Brian Richards Land
Life of this patent
Estimating the term…
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.
Claims20
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.
A method for generating compensated touch signals, comprising:
- 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.
A touch sensor panel for generating compensated touch signals, comprising:
- 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.
Dependencies are inferred from the claim text.