System and method for determining user input and interference on an input device
First Claim
1. A processing system for a capacitive input device, the capacitive input device comprising a transmitter sensor electrode and a receiver sensor electrode capacitively coupled to the transmitter sensor electrode, wherein the processing system comprises:
- transmitter circuitry configured to drive a transmitter signal onto the transmitter sensor electrode, the transmitter signal comprising a transmitter waveform with repeating cycles, wherein each cycle of the transmitter waveform includes a first transition;
receiver circuitry configured to receive, from the receiver sensor electrode, a resulting signal, the resulting signal including effects corresponding to the transmitter signal and indicative of a user input in the sensing region; and
accumulator circuitry configured to, for each cycle of the transmitter waveform;
separately accumulate a first portion of the resulting signal using a first channel with a first capacitor and produce a first accumulation used for determining the user input, andaccumulate a second portion of the resulting signal using a second channel and produce a second accumulation used for determining interference,wherein the second portion is accumulated during a reset period that is non-coterminous with the first portion, andwherein the first accumulation is discharged from the first capacitor during the reset period.
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Accused Products
Abstract
The embodiments described herein provide devices and methods that facilitate improved performance. In one embodiment, an input device comprises a processing system, a transmitter sensor electrode, and a receiver sensor electrode, where the transmitter sensor electrode and the receiver sensor electrode are capacitively coupled. The processing system is configured to receive a resulting signal from the receiver sensor electrode, where the resulting signal includes responses that correspond to the transmitter signal. The processing system is further configured to separately accumulate, for each cycle of the transmitter waveform, a first portion and a second portion of the resulting signal to respectively produce a first accumulation and a second accumulation, wherein the first accumulation is used for determining user input to the input device and the second accumulation is used for determining interference, and wherein the first portion and the second portion are non-coterminous.
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Citations
20 Claims
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1. A processing system for a capacitive input device, the capacitive input device comprising a transmitter sensor electrode and a receiver sensor electrode capacitively coupled to the transmitter sensor electrode, wherein the processing system comprises:
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transmitter circuitry configured to drive a transmitter signal onto the transmitter sensor electrode, the transmitter signal comprising a transmitter waveform with repeating cycles, wherein each cycle of the transmitter waveform includes a first transition; receiver circuitry configured to receive, from the receiver sensor electrode, a resulting signal, the resulting signal including effects corresponding to the transmitter signal and indicative of a user input in the sensing region; and accumulator circuitry configured to, for each cycle of the transmitter waveform; separately accumulate a first portion of the resulting signal using a first channel with a first capacitor and produce a first accumulation used for determining the user input, and accumulate a second portion of the resulting signal using a second channel and produce a second accumulation used for determining interference, wherein the second portion is accumulated during a reset period that is non-coterminous with the first portion, and wherein the first accumulation is discharged from the first capacitor during the reset period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An input device for capacitively sensing input objects in a sensing region, comprising:
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a transmitter sensor electrode and a receiver sensor electrode, wherein the transmitter sensor electrode is capacitively coupled to the receiver sensor electrode; a processing system configured to; drive a transmitter signal onto the transmitter sensor electrode, the transmitter signal comprising a transmitter waveform with repeating cycles, wherein each cycle of the transmitter waveform includes a first transition; receive a resulting signal from the receiver sensor electrode, the resulting signal including effects corresponding to the transmitter signal and indicative of a user input in the sensing region; separately accumulate, for each cycle of the transmitter waveform, a first portion of the resulting signal using a first channel with a first capacitor to produce a first accumulation used for determining the user input to the input device; and accumulate a second portion of the resulting signal using a second channel to produce a second accumulation used for determining interference, wherein the second portion is accumulated during a reset period that is non-coterminous with the first portion, and wherein the first accumulation is discharged from the first capacitor during the reset period. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of operating a capacitive input device, the method comprising:
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driving a transmitter signal onto a transmitter sensor electrode, the transmitter signal comprising a transmitter waveform with repeating cycles, wherein each cycle of the transmitter waveform includes a first transition; receiving a resulting signal from a receiver sensor electrode, the resulting signal including effects corresponding to the transmitter signal and indicative of a user input in the sensing region; separately accumulating, for each cycle of the transmitter waveform, a first portion of the resulting signal using a first channel with a first capacitor to produce a first accumulation; accumulating a second portion of the resulting signal to produce a second accumulation, wherein the second portion is accumulated during a reset period that is non-coterminous with the first portion, wherein the first accumulation is discharged from the first capacitor during the reset period, and wherein the first portion includes effects of the first transition on the resulting signal, and wherein the second portion starts after a beginning of the first portion; determining the user input using the first accumulation; and determining interference using the second accumulation of the resulting signal. - View Dependent Claims (18, 19, 20)
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Specification