Sensor with diffusing resistor
First Claim
1. An apparatus comprising:
- a touch sensor panel including;
a plurality of sense electrodes, including a first sense electrode and a second sense electrode;
a plurality of diffusing resistors, including a first diffusing resistor coupled between the first sense electrode and the second sense electrode;
a plurality of conductive traces, including a first conductive trace coupling the first sense electrode to the sense circuitry, and a second conductive trace coupling the second sense electrode to the sense circuitry;
a plurality of compensating resistances, including a first compensating resistance in series with the first conductive trace and a second compensating resistance in series with the second conductive trace; and
sense circuitry coupled to the first and second sense electrodes and configured to detect a touch signal using the first sense electrode and the second sense electrode,wherein;
a first series resistance associated with the first conductive trace and the first compensating resistor is substantially equal to a common series resistance; and
a second series resistance associated with the second conductive trace and the second compensating resistor is substantially equal to the common series resistance.
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Accused Products
Abstract
Electrode configurations for reducing wobble error for a stylus translating on a surface over and between electrodes of a touch sensor panel is disclosed. In some examples, electrodes associated with a more linear signal profile are correlated with lower wobble error. In some examples, electrodes are coupled to adjacent electrodes via diffusing resistors such that the signal profile for each electrode is spread to be more linear. In some configurations, the value of the diffusing resistors and series resistance associated with an electrode is selected based on a desired signal profile for that electrode. In some examples, the series resistance can include a trace resistance and a compensating resistance. The compensating resistance can compensate for a variance in trace resistance between electrodes, thus making series resistance substantially equal for each of the electrodes.
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Citations
25 Claims
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1. An apparatus comprising:
a touch sensor panel including; a plurality of sense electrodes, including a first sense electrode and a second sense electrode; a plurality of diffusing resistors, including a first diffusing resistor coupled between the first sense electrode and the second sense electrode; a plurality of conductive traces, including a first conductive trace coupling the first sense electrode to the sense circuitry, and a second conductive trace coupling the second sense electrode to the sense circuitry; a plurality of compensating resistances, including a first compensating resistance in series with the first conductive trace and a second compensating resistance in series with the second conductive trace; and sense circuitry coupled to the first and second sense electrodes and configured to detect a touch signal using the first sense electrode and the second sense electrode, wherein; a first series resistance associated with the first conductive trace and the first compensating resistor is substantially equal to a common series resistance; and a second series resistance associated with the second conductive trace and the second compensating resistor is substantially equal to the common series resistance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for detecting an object proximate to a touch sensor panel, the method comprising:
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detecting, at a first sense electrode, a first portion of a signal originating from a coupling between the first sense electrode and the object; detecting, at a second sense electrode, a second portion of the signal originating from the coupling between the first sense electrode and the object, wherein the second portion of the signal is diffused by a diffusing resistance from the first sense electrode to the second sense electrode; and determining a location of the object from the first and second portions of the signal at sense circuitry, wherein; a first conductive trace couples the first sense electrode to the sense circuitry and a second conductive trace couples the second sense electrode to the sense circuitry; a first compensating resistance in series with the first conductive trace wherein a first series resistance associated with the first conductive trace and the first compensating resistor is substantially equal to a common series resistance; and a second compensating resistance in series with the second conductive trace wherein a second series resistance associated with the second conductive trace and the second compensating resistor is substantially equal to the common series resistance. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification