Simultaneous self- and mutual capacitance sensing
First Claim
1. A touch controller comprising:
- first sense circuitry configured to be coupled to a first column electrode on a touch sensor panel and configured to drive the first electrode with a first signal;
second sense circuitry configured to be coupled to a first row electrode on the touch sensor and drive the second electrode with a second signal;
a first mixer and a second mixer coupled in parallel to an output of the first sense circuitry, the first mixer configured to demodulate the output from the first sense circuitry using the first signal to measure a first capacitance from the first output, the second mixer configured to simultaneously demodulate the output from the first sense circuitry using the second signal to measure a second capacitance from the first output, wherein the first signal is different from the second signal; and
a third mixer coupled to an output of the second sense circuitry, the third mixer configured to demodulate the output from the second sense circuitry using the second signal to measure a third capacitance from the second output simultaneously to the measurement of the first and second capacitance,wherein the second capacitance comprises a mutual capacitance between the first electrode and the second electrode.
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Accused Products
Abstract
A touch controller. The touch controller can include first sense circuitry configured to be coupled to a first electrode on a touch sensor panel, the first sense circuitry configured to sense a first self-capacitance associated with the first electrode, and a first mutual capacitance associated with the first electrode. In some examples, the first sense circuitry can be configured to sense the first self-capacitance and the first mutual capacitance simultaneously. In some examples, the touch controller can further include a first mixer and a second mixer coupled to the first sense circuitry, the first mixer configured to demodulate a first output from the first sense circuitry to extract information about the first self-capacitance from the first output, the second mixer configured to demodulate the first output from the first sense circuitry to extract information about the first mutual capacitance from the first output.
32 Citations
17 Claims
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1. A touch controller comprising:
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first sense circuitry configured to be coupled to a first column electrode on a touch sensor panel and configured to drive the first electrode with a first signal; second sense circuitry configured to be coupled to a first row electrode on the touch sensor and drive the second electrode with a second signal; a first mixer and a second mixer coupled in parallel to an output of the first sense circuitry, the first mixer configured to demodulate the output from the first sense circuitry using the first signal to measure a first capacitance from the first output, the second mixer configured to simultaneously demodulate the output from the first sense circuitry using the second signal to measure a second capacitance from the first output, wherein the first signal is different from the second signal; and a third mixer coupled to an output of the second sense circuitry, the third mixer configured to demodulate the output from the second sense circuitry using the second signal to measure a third capacitance from the second output simultaneously to the measurement of the first and second capacitance, wherein the second capacitance comprises a mutual capacitance between the first electrode and the second electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating a touch controller, the method comprising:
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driving, using first sense circuitry, a first column electrode on the touch sensor panel with a first signal; sensing, using the first sense circuitry, a first output associated with the first electrode on the touch sensor panel; driving, using second sense circuitry, a first column electrode on the touch sensor panel with a second signal; sensing, using the second sense circuitry, a second output associated with the second electrode; demodulating the output from the first sense circuitry at a first demodulator using the first signal to measure a first capacitance from the first output, demodulating the output from the first sense circuitry at a second demodulator using the second signal to measure a second capacitance from the first output, demodulating the output from the second sense circuitry using the second signal to measure a third capacitance from the second output; wherein the first demodulator and the second demodulator are coupled in parallel to the first output from the first sense circuitry and the second capacitance comprises a mutual capacitance between the first electrode and the second electrode. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification