Abstract: A capacitive sensing input system includes sensor electrodes disposed in a sensor electrode pattern and a processing system. When under a low ground mass (LGM) condition, proximity-sensing pairs of electrodes formed by a first selective pairing of the sensor electrodes have an increased sensitivity to a presence of an input object in comparison to LGM-sensitive pairs of electrodes formed by a second selective pairing of the sensor electrodes that are primarily sensitive to the LGM condition. The processing system is configured to, while under the LGM condition, determine a first LGM term using a mutual capacitance sensing with a first of the LGM-sensitive pairs of electrodes, obtain a first transcapacitance sensing signal for a sensing element formed by a first of the proximity-sensing pairs of electrodes, and generate an LGM-corrected transcapacitance sensing signal by correcting the first transcapacitance sensing signal using the first LGM term.

Abstract: A sensor pattern for capacitive sensing includes a first electrode and a multitude of second electrodes capacitively coupled to the first electrode. The first electrode includes a strip extending in a vertical direction across the sensor pattern. The multitude of second electrodes include a first subset and a second subset. The first subset of the multitude of second electrodes is arranged in a first column, the first column extending in a vertical direction. The second subset of the multitude of second electrodes is arranged in a second column, the second column extending in the vertical direction. The first subset and the second subset of the multitude of electrodes are disposed adjacent to the first electrode on opposing sides of the first electrode.

Abstract: An input device includes a display substrate and a stack of display layers disposed on the display substrate, the stack of display layers including a conductive layer. The input device further includes at least one capacitive sensing layer in the stack of display layers and a multitude of capacitive sensing electrodes disposed in the at least one capacitive sensing layer, and configured for capacitance sensing. The input device also includes a processing system configured to selectively drive the multitude of capacitive sensing electrodes to emit a first sensing signal while balancing a total current induced in the conductive layer, caused by an electromagnetic emission associated with the first sensing signal.

Abstract: A system and method for capacitive sensing comprise acquiring first capacitive sensor data and second capacitive sensor data from a plurality of sensor electrodes, and determining positional information from one or more input objects based on the first capacitive sensor data and the second capacitive sensor data. The plurality of sensor electrodes are driven with transcapacitive sensing signals for capacitive sensing during one or more transcapacitive sensing blocks to acquire the first sensor data. Further, the plurality of sensor electrodes are operated for absolute capacitive sensing during one or more absolute capacitive sensing blocks to acquire the second capacitive sensor data.

Abstract: A capacitive sensing input system includes sensor electrodes disposed in a sensor electrode pattern and a processing system. When under a low ground mass (LGM) condition, proximity-sensing pairs of electrodes formed by a first selective pairing of the sensor electrodes have an increased sensitivity to a presence of an input object in comparison to LGM-sensitive pairs of electrodes formed by a second selective pairing of the sensor electrodes that are primarily sensitive to the LGM condition. The processing system is configured to, while under the LGM condition, determine a first LGM term using a mutual capacitance sensing with a first of the LGM-sensitive pairs of electrodes, obtain a first transcapacitance sensing signal for a sensing element formed by a first of the proximity-sensing pairs of electrodes, and generate an LGM-corrected transcapacitance sensing signal by correcting the first transcapacitance sensing signal using the first LGM term.

Abstract: An input device includes a display substrate and a stack of display layers disposed on the display substrate, the stack of display layers including a conductive layer. The input device further includes at least one capacitive sensing layer in the stack of display layers and a multitude of capacitive sensing electrodes disposed in the at least one capacitive sensing layer, and configured for capacitance sensing. The input device also includes a processing system configured to selectively drive the multitude of capacitive sensing electrodes to emit a first sensing signal while balancing a total current induced in the conductive layer, caused by an electromagnetic emission associated with the first sensing signal.

Abstract: A system and method for capacitive sensing comprise acquiring first capacitive sensor data and second capacitive sensor data from a plurality of sensor electrodes, and determining positional information from one or more input objects based on the first capacitive sensor data and the second capacitive sensor data. The plurality of sensor electrodes are driven with transcapacitive sensing signals for capacitive sensing during one or more transcapacitive sensing blocks to acquire the first sensor data. Further, the plurality of sensor electrodes are operated for absolute capacitive sensing during one or more absolute capacitive sensing blocks to acquire the second capacitive sensor data.

Abstract: A processing system includes a sensor module configured to receive first and second signals from first and second sensor electrodes, respectively, and generate a combination signal. The processing system further includes a determination module configured to determine, using the first sensor electrode, an absolute capacitive coupling to an input object; determine, using the first and second sensor electrodes, a transcapacitive coupling; determine a ratio of the absolute to transcapacitive coupling; determine, using the combination signal, in absence of a predetermined low ground mass state, and when the ratio fails to exceed a predetermined threshold, first positional information regarding a location of the input object; and determine, when the ratio fails to exceed the predetermined threshold and in presence of the predetermined low ground mass state, second positional information regarding the location of the input object in the sensing region using an absolute capacitive scan.

Abstract: A sensor pattern for capacitive sensing includes a first electrode and a multitude of second electrodes capacitively coupled to the first electrode. The first electrode includes a strip extending in a vertical direction across the sensor pattern. The multitude of second electrodes include a first subset and a second subset. The first subset of the multitude of second electrodes is arranged in a first column, the first column extending in a vertical direction. The second subset of the multitude of second electrodes is arranged in a second column, the second column extending in the vertical direction. The first subset and the second subset of the multitude of electrodes are disposed adjacent to the first electrode on opposing sides of the first electrode.

Abstract: A system and method for capacitive sensing comprise acquiring first capacitive sensor data and second capacitive sensor data from a plurality of sensor electrodes, and determining positional information from one or more input objects based on the first capacitive sensor data and the second capacitive sensor data. The plurality of sensor electrodes are driven with transcapacitive sensing signals for capacitive sensing during one or more transcapacitive sensing blocks to acquire the first sensor data. Each of the transcapacitive sensing signals is based on a respective one of a plurality of codes. Further, the plurality of sensor electrodes are operated for absolute capacitive sensing during one or more absolute capacitive sensing blocks to acquire the second capacitive sensor data.

Abstract: A method and apparatus for dynamically rescanning an array of sensor electrodes of an input device. The input device performs a first scan of the array over a plurality of iterations to acquire a frame of sensor data, where a different subframe of the sensor data is acquired from each iteration of the first scan. During each iteration of the first scan, the input device compares the subframe of sensor data acquired from the iteration with a respective subframe of sensor data acquired prior to the iteration. In some implementations, the input device may selectively repeat one or more iterations of the first scan based on the comparison.

Abstract: A system and method for capacitive sensing comprise acquiring first capacitive sensor data and second capacitive sensor data from a plurality of sensor electrodes, and determining positional information from one or more input objects based on the first capacitive sensor data and the second capacitive sensor data. The plurality of sensor electrodes are driven with transcapacitive sensing signals for capacitive sensing during one or more transcapacitive sensing blocks to acquire the first sensor data. Each of the transcapacitive sensing signals is based on a respective one of a plurality of codes. Further, the plurality of sensor electrodes are operated for absolute capacitive sensing during one or more absolute capacitive sensing blocks to acquire the second capacitive sensor data.

Abstract: A processing system includes a sensor module configured to receive first and second signals from first and second sensor electrodes, respectively, and generate a combination signal. The processing system further includes a determination module configured to determine, using the first sensor electrode, an absolute capacitive coupling to an input object; determine, using the first and second sensor electrodes, a transcapacitive coupling; determine a ratio of the absolute to transcapacitive coupling; determine, using the combination signal, in absence of a predetermined low ground mass state, and when the ratio fails to exceed a predetermined threshold, first positional information regarding a location of the input object; and determine, when the ratio fails to exceed the predetermined threshold and in presence of the predetermined low ground mass state, second positional information regarding the location of the input object in the sensing region using an absolute capacitive scan.

Abstract: A method and apparatus for authenticating a fingerprint image captured through an optical sensor. For at least some embodiments, light scattering characteristics associated with a fingerprint are determined and compared to a reference light scattering characteristic. The fingerprint is authenticated when the light scattering characteristics are within a threshold difference of the reference light scattering characteristic. For some embodiments, the light scattering characteristics associated with the fingerprint are compared to light scattering characteristics associated with one or more reference (enrollment) images. For at least some embodiments, the light scattering characteristics may be based on a correlation value based on identified pixels and one or more pixels neighboring the identified pixel.

Abstract: A method and apparatus for authenticating a fingerprint image captured through an optical sensor. For at least some embodiments, light scattering characteristics associated with a fingerprint are determined and compared to a reference light scattering characteristic. The fingerprint is authenticated when the light scattering characteristics are within a threshold difference of the reference light scattering characteristic. For some embodiments, the light scattering characteristics associated with the fingerprint are compared to light scattering characteristics associated with one or more reference (enrollment) images. For at least some embodiments, the light scattering characteristics may be based on a correlation value based on identified pixels and one or more pixels neighboring the identified pixel.

Abstract: Devices and methods are provided that facilitate improved interference avoidance performance. The devices and methods determine a relative ranking for a plurality of transmitter signals based on a first class of interference for each transmitter signal of the plurality of transmitter signals. The devices and methods transmit a first transmitter signal of the plurality of transmitter signals with a sensor electrode of the plurality of sensor electrodes. The first transmitter signal is selected based on the relative ranking for the plurality of transmitter signals. The devices and methods shift from transmitting the first transmitter signal to transmitting a second transmitter signal of the plurality of transmitter signals with the sensor electrode is based on an amount of a second class of interference in the first transmitter signal. The second transmitter signal is selected based on the relative ranking for the plurality of transmitter signals.

Abstract: A capacitance measurement circuit comprises a differential amplifier with first and second inputs and an output, first and second feedback capacitances, and a reset mechanism. The first input is coupled to a modulated reference voltage and the second input is coupled with a sensor electrode. A first feedback capacitance is coupled between the output and the second input. A second feedback capacitance is coupled between the output and the second input. The reset mechanism resets the first feedback capacitance to a first level of charge and the second feedback capacitance to a second level of charge. During an absolute capacitance measurement phase, the differential amplifier charges the sensor electrode while balancing voltages on the first and second inputs to a voltage level associated with the modulated reference voltage and integrates charge on the sensor electrode to measure capacitance corresponding to a coupling between the sensor electrode and an input object.

Abstract: A processing system for a capacitive touch screen comprises sensor circuitry and control logic. The sensor circuitry is configured to communicatively couple with sensor electrodes of the capacitive touch screen. The control logic is configured to operate the capacitive touch screen in a first mode comprising interference sensing at a first level and input object sensing. The control logic is also configured to operate the capacitive touch screen in a second mode instead of the first mode in response to: interference measured in the first mode meeting an interference condition; and a determination that input is in a sensing region of the capacitive touch screen. Operating in the first mode, interference sensing is performed during a non-display update time. Operating in the second mode, interference sensing with the capacitive touch screen is either not performed or is performed at a second level, lower in fidelity than the first level.

Abstract: Examples of the present disclosure generally provide current feedback techniques for capacitive sensing with an input device. A processing system for an input device includes an operational amplifier having a non-inverting input, an inverting input, and an output. A voltage source is coupled to the non-inverting input. A first voltage-controlled current source is coupled between the output and the inverting input to form a feedback path. A second voltage-controlled current source is coupled to the output and configured for modifying a charge on a capacitor based on a control voltage at the output. A determination module is coupled to the capacitor and configured for determining a capacitance measurement at the inverting input based on the charge on the capacitor.

Abstract: A method of capacitive sensing may include driving a first modulated signal onto a first sensor electrode in an input device and a second modulated signal onto a second sensor electrode in the input device. The method may further include receiving, simultaneously, a first resulting signal from the first sensor electrode and a second resulting signal from the second sensor electrode. The method may further include generating, based at least in part on the first resulting signal and the second resulting signal, a combination signal. The method may further include determining, using the combination signal, when the input device is not disposed in a predetermined low ground mass state, and when a ratio of capacitive coupling exceeds a predetermined threshold, first positional information regarding a location of the input object in the sensing region.