DUAL-MODE CAPACITANCE SENSING IN A TOUCH PANEL SENSOR
First Claim
1. A system comprising:
- a sensor configured to detect a change in capacitance associated with a touch event upon a touch panel;
a measuring component coupled to the sensor, the measuring component configured to detect mutual-capacitance associated with the sensor during a first mode of operation and to detect self-capacitance associated with the sensor during a second mode of operation;
a selection component coupled to the sensor and to the measuring component, the selection component configured to receive a selection signal to cause selection of at least the first mode of operation or the second mode of operation; and
a driver component coupled to the selection component, the driver component configured to generate a drive signal, the drive signal furnished to the sensor during the first mode of operation and to the measuring module during the second mode of operation,wherein the drive signal includes a first amplitude characteristic during the first mode of operation and includes a second amplitude characteristic during the second mode of operation, the second amplitude characteristic different from the first amplitude characteristic.
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Accused Products
Abstract
A touch panel sensor system configured to measure mutual-capacitance and self-capacitance is disclosed. The touch panel sensor system includes a sensor configured to detect a change in capacitance associated with a touch event upon a touch panel and a measuring component. The measuring component is configured to detect mutual-capacitance during the first mode of operation and to detect self-capacitance during the second mode of operation. The system also includes a selection component that is configured to receive a selection signal to cause selection of the mode of operation. The system also includes a driver component coupled to the selection component and configured to generate a drive signal, which is furnished to the sensor during the first mode of operation and furnished to the measuring module during the second mode of operation. The amplitude characteristic of the drive signal may have differing values for the first and second modes of operation.
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Citations
20 Claims
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1. A system comprising:
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a sensor configured to detect a change in capacitance associated with a touch event upon a touch panel; a measuring component coupled to the sensor, the measuring component configured to detect mutual-capacitance associated with the sensor during a first mode of operation and to detect self-capacitance associated with the sensor during a second mode of operation; a selection component coupled to the sensor and to the measuring component, the selection component configured to receive a selection signal to cause selection of at least the first mode of operation or the second mode of operation; and a driver component coupled to the selection component, the driver component configured to generate a drive signal, the drive signal furnished to the sensor during the first mode of operation and to the measuring module during the second mode of operation, wherein the drive signal includes a first amplitude characteristic during the first mode of operation and includes a second amplitude characteristic during the second mode of operation, the second amplitude characteristic different from the first amplitude characteristic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system comprising:
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a sensor configured to detect a change in capacitance associated with a touch event upon a touch panel; a measuring component coupled to the sensor, the measuring component configured to detect mutual-capacitance associated with the sensor during a first mode of operation and to detect self-capacitance associated with the sensor during a second mode of operation; a selection component coupled to the sensor and to the measuring component, the selection component configured to receive a selection signal to cause selection of at least the first mode of operation or the second mode of operation; a driver component coupled to the selection component, the driver component configured to generate a drive signal, the drive signal furnished to the sensor during the first mode of operation and to the measuring module during the second mode of operation; and a control component coupled to the selection component, the control component configured to cause issuance of the selection signal to the selection component to cause selection of at least one of the first mode of operation or the second mode of operation wherein the drive signal includes a first amplitude characteristic during the first mode of operation and includes a second amplitude characteristic during the second mode of operation, the second amplitude characteristic different from the first amplitude characteristic. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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causing issuance of a selection signal to a selection component to cause selection of a first mode of operation to measure mutual-capacitance associated with a sensor or a second mode of operation to measure self-capacitance associated with the sensor, the sensor configured to detect a change in capacitance associated with a touch event upon a touch panel; adjusting an offset cancellation capacitance furnished by an offset component until the offset cancellation capacitance at least approximately equals a capacitance associated with a drive channel and the sensor to at least partially cancel the capacitance associated with the drive channel and the sensor; adjusting a phase of a first signal to at least approximately one hundred and eighty degrees (180°
) of a phase of a second signal to at least partially cancel the second signal, the first signal generated by an offset cancellation driver component and the second signal generated by a sensor driver component of the drive channel; andadjusting an amplitude of the first signal to equal at least a portion of an amplitude of the second signal to at least partially cancel a remaining portion of the second signal, the remaining portion of the second signal including a portion of the second signal not cancelled by the adjustment of the phase of the first signal. - View Dependent Claims (18, 19, 20)
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Specification