Synaptics Corporation

Jonathan Losh

Derek Solven

Matthew A Stevenson

Daisuke Ito

Joseph Kurth Reynolds

Tracy Scott Dattalo

Robert J Bolender

John Weinerth

Nickolas Fotopoulos

Katayoun Goudarzi

Dipankar Talukdar

Hiroshi Takeyama

Renuka Vidyut Shenoy

Vladan Petrovic

Sanjay Mani

Don A Speck

A processing system configured to receive a first display control signal corresponding to a non-display update period of a display frame and a second display control signal corresponding to a display update period of the display frame. The processing system is further configured to acquire, based on receipt of the first display control signal, first resulting signals from sensor electrodes electrically connected to the sensor driver by operating the sensor electrodes for a first type of input sensing during a first period overlapping with at least a portion of the non-display update period. Further, the processing system is configured to acquire, based on receipt of the second display control signal, second resulting signals with the sensor electrodes by operating the sensor electrodes for a second type of input sensing during a second period overlapping with at least a portion of the display update period.

Synchronizing input sensing with display updating

A processing system for an input device comprises sensor circuitry. The sensor circuitry is configured to operate sensor electrodes for input sensing during a first sensing frame. During a first period of the first sensing frame the sensor circuitry is configured to drive a first portion of the sensor electrodes with a sensing signal, drive a second portion of the sensor electrodes with a guarding signal, and drive a third portion of the sensor electrodes with a reference signal. The guarding signal and the sensing signal have at least one characteristic in common selected from the group consisting of amplitude, phase and frequency. The third portion of the sensor electrodes overlaps a first gate line of a display panel selected for updating during the first period.

Reducing interference within a display panel while performing input sensing

An input-display device includes a display screen disposed on a display substrate, the display screen including a multitude of display pixels. The input-display device further includes a multitude of capacitive sensing electrodes for capacitive sensing in a sensing region of the display screen. The input-display device also includes a source driver circuit configured to generate a data voltage for driving a pixel circuit associated with one display pixel of the multitude of display pixels and determine a timing for a compensatory modulation of the data voltage. The timing is determined using a sensing waveform of the capacitive sensing. The source driver circuit is also configured to determine an amplitude of the compensatory modulation, generate a modulated data voltage by applying the compensatory modulation to the data voltage, and drive the pixel circuit using the modulated data voltage.

Source output voltage compensation for display noise

A sensor driver comprises a receiver and an interference mitigation element. The receiver is configured to acquire a resulting signal from a sensor electrode. The interference mitigation element is communicatively coupled with the receiver and is configured to receive interference data, generate an interference estimate from the interference data and a transfer function, and communicate the interference estimate to the receiver. The interference estimate removes charge from a resulting signal, mitigating effects of interference within the resulting signal.

Display interference mitigation

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.

System and method for generating corrected sensor data

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.

Sensor electrodes are coupled, in a first configuration, to input channels of a processing system. The sensor electrodes are used to acquire a measurement of current. In a second configuration that is different from the first configuration, the sensor electrodes are coupled to the input channels. The sensor electrodes in the second configuration are used to acquire a capacitive resulting signal. Positional information is determined using the current measurement and the capacitive resulting signal.

Electrode combining for noise determination

Transmitter axis projection for capacitive sensing is disclosed. Transmitter axis projection includes having processing system. The processing system includes sensor circuitry configured to be coupled to transmitter electrodes and receiver electrodes. The sensor circuitry is configured to drive the transmitter electrodes with first transmitter signals and receive first resulting signals from the receiver electrodes, and drive only a first subset of the receiver electrodes with second transmitter signals and receive second resulting signals with the transmitter electrodes. The processing system further includes processing circuitry connected to the sensor circuitry and configured to partition the receiver electrodes into the first subset of receiver electrodes and a second subset of receiver electrodes, and generate a transmitter axis projection from the second resulting signals.

Transmitter axis projection construction for capacitive sensing

A processing system for reducing background capacitance associated with a touch surface. The processing system includes: transmitter circuitry that drives a transmitter electrode of the touch surface with a waveform; receiver circuitry that detects input in a sensing region of the touch surface based on a resulting signal from a receiver electrode of the touch surface; and offset reduction circuitry connected to the receiver circuitry that: subtracts, prior to completion of an integration period of the waveform, a first plurality of charge associated with background capacitance from the resulting signal using a capacitor; executes a first reload of the capacitor prior to completion of the integration period of the waveform; and subtracts, prior to completion of the integration period of the waveform, a second plurality of charge associated with background capacitance from the resulting signal using the capacitor after the first reload.

Reducing background capacitance associated with a touch surface

An input device includes a receiver electrode, a transmitter electrode and a processing system coupled to the receiver electrode and transmitter electrode. The processing system is configured to transmit a transmitter signal with the transmitter electrode during a first time period, inject a charge onto the receiver electrode during a second time period, and receive a resulting signal from the receiver electrode during a third time period. The resulting signal includes effects corresponding to the injected charge. The second time period and the third time period are non-overlapping.

Sensor side charge cancellation

A processing system, including: a sensor module that: receives, in a first sensing modality, first resulting signals from electrodes in a sensing region; and receives, in a second sensing modality, second resulting signals from a subset of receiver electrodes; and receiver hardware channels that process the second resulting signals, where the number of receiver electrodes exceeds the number of hardware channels; and a determination module that: measures a first plurality of capacitive changes based on the first resulting signals; determines, based on the first plurality of capacitive changes, the section of the sensing region in which an input object is located; selects the subset of the receiver electrodes corresponding to the section; measures a second plurality of capacitive changes based on the second resulting signals; and determines a position of the input object within the section based on the second plurality of capacitive changes.

Selective receiver electrode scanning

In a method of capacitive sensing, a first plurality of sensor electrodes of a sensor electrode pattern is coupled, in a first configuration, to input channels of a processing system. The sensor electrode pattern is associated with a sensing region. The first configuration of the first plurality sensor of electrodes is utilized to acquire a measurement of current. A noise environment is determined through analysis of the measurement of current. At least one subset of the first plurality of sensor electrodes is coupled, in a second configuration, to the input channels. The second configuration and the first configuration are different. The second configuration of the first plurality of sensor electrodes is utilized to acquire capacitive resulting signals.

Embodiments include a method, input device, and processing system for operating a plurality of sensor electrodes for capacitive sensing. The method includes acquiring a first capacitive partial profile by driving a first capacitive sensing signal onto a first sensor electrode of a first plurality of sensor electrodes while driving a second sensor electrode of the first plurality of sensor electrodes with a substantially constant voltage. The method further includes acquiring a second capacitive partial profile by driving a second capacitive sensing signal onto the second sensor electrode while driving the first sensor electrode with the substantially constant voltage, and determining a first capacitive profile based on at least the acquired first capacitive partial profile and the second capacitive partial profile.

Growing community of inventors

Mountain View, CA, United States of America

Jonathan Losh