Abstract:
An approach is provided for estimating and correcting parasitic responses of a touch sensor device. The input device measures a first capacitance signal generated by a first pixel that is covered at least partially by an input object. The input device measures a second capacitance signal generated by a second pixel that is covered at least partially by the input object. The input device measures a third capacitance signal generated by a third pixel. Based on at least the first capacitance signal and the second capacitance signal, the input device identifies a position of the input object within the sensing region. Based on the position of the input object, the input device identifies a trace covered by the input object and associated with the third pixel. The input device calculates an updated third capacitance signal by subtracting a correction amount from the third capacitance signal.
Abstract:
A circular, single-layer sensor electrode pattern for input devices, such as wearable devices, is described. The sensor electrode pattern features transmitter electrodes and receiver electrodes tiled in alternating fashion, such that each receiver electrode is surrounded by transmitter electrodes. The individual sensor electrodes of the described pattern are designed to provide a substantially uniform electrode area size across the sensor. Additionally, the sensor electrode pattern is arranged to be symmetric across both horizontal and vertical axes. The provided characteristics of the sensor electrode pattern leads to a sensor structure having uniform absolute capacitive sensing measurements for all sensor electrodes as well as uniform transcapacitive sensing measurements for all “pixels.”
Abstract:
Embodiments of the invention generally provide an input device having a reduced system complexity and low production cost. As the size of input devices, such as touch pads and other similar devices increase, the need for an input device that is able to maintain or even improve the touch sensing accuracy without greatly increasing the manufacturing cost becomes increasingly important. Embodiments of the invention may provide an input device that includes an array of capacitive sensing pixels that each include a unique pair of sensor electrodes, wherein at least one of the electrodes in a first pixel is also in communication with another sensor electrode in at least one other pixel, which is not in the same row or column with the first pixel.
Abstract:
In an example, a capacitive image sensor comprises a first sensor electrode, a second sensor electrode, and a third sensor electrode. The first sensor electrode is disposed on a first surface of a substrate configured to transmit a transmitter signal. The second sensor electrode is disposed on the first surface of the substrate configured to receive a resulting signal. The third sensor electrode is disposed on the first surface of the substrate such that the second sensor electrode is at least partially between the first sensor electrode and the third sensor electrode.
Abstract:
Embodiments of the invention generally provide an input device having a reduced system complexity and low production cost. As the size of input devices, such as touch pads and other similar devices increase, the need for an input device that is able to maintain or even improve the touch sensing accuracy without greatly increasing the manufacturing cost becomes increasingly important. Embodiments of the invention may provide an input device that includes an array of capacitive sensing pixels that each include a unique pair of sensor electrodes, wherein at least one of the electrodes in a first pixel is also in communication with another sensor electrode in at least one other pixel, which is not in the same row or column with the first pixel.
Abstract:
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.
Abstract:
A method and related processing system and input device are disclosed for power consumption optimization using interference measurements. The method comprises applying, within a predefined first low-power operational mode, a first set of values for at least one predefined sensing parameter and corresponding to a first power consumption level; acquiring, within the first low-power operational mode, a first interference measurement using the plurality of sensor electrodes; transitioning, upon determining the first interference measurement exceeds a first interference threshold value, into a predefined high-power operational mode; and applying, within the high-power operational mode, a second set of values for the at least one predefined sensing parameter and corresponding to a second power consumption level greater than the first power consumption level.
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:
Embodiments of the invention generally provide an input device that includes a plurality of sensing elements that are interconnected in desired way to acquire positional information of an input object, so that the acquired positional information can be used by other system components to control a display or other useful system components. One or more of the embodiments described herein, utilizes one or more of the techniques and sensor electrode array configuration disclosed herein to reduce or minimize the number of traces and/or electrodes required to sense the position of an input object within a sensing region of the input device.
Abstract:
A single-layer capacitive sensor comprises a user input region and a border region proximate to and outside of the user input region. The user input region includes a plurality of transmitter electrodes that are disposed within the user input region. The user input region also comprises a plurality of receiver electrodes disposed in a common stackup layer with the plurality of transmitter electrodes within the user input region such that the transmitter electrodes and the receiver electrodes make no crossings of one another in the common stackup layer or in any other layer within the user input region. The border region comprises a plurality of routing traces extending from the border region into the user input region to couple with the transmitter electrodes and the receiver electrodes. The border region also comprises a plurality of transmission traces disposed entirely within the border region.