NOISE CORRECTION FOR STYLUS APPLICATIONS ON TABLETS AND OTHER TOUCH DEVICES
First Claim
1. A stylus detection apparatus for detecting contacts from a stylus, the apparatus comprising:
- a touch sensor panel comprising a plurality of electrodes, each electrode configured to receive one or more signals from a stylus; and
a processor, the processor capable of;
measuring a first signal from a first electrode;
measuring one or more signals from a pre-determined number of second electrodes;
generating a noise estimate based on the measured one or more signals from the pre-determined number of second electrodes; and
adjusting the measured first signal based on at least the generated noise estimate.
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Accused Products
Abstract
A touch sensitive device capable of detecting signals generated by a stylus and correcting the detected stylus signals for effects due to noise present on the device is disclosed. In one example, signals are taken from one or more electrodes that are a pre-determined distance away from an electrode in which a stylus signal is detected. The pre-determined distance can be empirically determined such that a noise estimate can be generated such that the electrodes have a higher probability of containing only noise that is highly correlated to the noise present on a detected stylus signal. The generated noise estimate is then subtracted from a detected stylus signal to reduce the effect of noise on the stylus signal.
41 Citations
24 Claims
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1. A stylus detection apparatus for detecting contacts from a stylus, the apparatus comprising:
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a touch sensor panel comprising a plurality of electrodes, each electrode configured to receive one or more signals from a stylus; and a processor, the processor capable of; measuring a first signal from a first electrode; measuring one or more signals from a pre-determined number of second electrodes; generating a noise estimate based on the measured one or more signals from the pre-determined number of second electrodes; and adjusting the measured first signal based on at least the generated noise estimate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of correcting a detected stylus signal for the effects of noise, the method comprising:
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detecting a first stylus signal from a first electrode of a touch sensor panel; measuring one or more signals from a pre-determined number of second electrodes; generating a noise estimate based on the measured one or more signals from the pre-determined number of second electrodes; and adjusting the measured first signal based on at least the generated noise estimate. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A non-transitory computer readable storage medium having stored thereon a set of instructions for detecting a stylus signal and correcting the stylus signal for effects caused by noise in a touch sensor panel that when executed by a processor causes the processor to:
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detect a first stylus signal from a first electrode of a touch sensor panel; measure one or more signals from a pre-determined number of second electrodes; generate a noise estimate based on the measured one or more signals from the pre-determined number of second electrodes; and adjust the measured first signal based on at least the generated noise estimate. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification