Abstract: A device stores running baseline measurements and initial baseline measurements for a plurality of touch sensors. The device repeatedly takes measurements from the touch sensors during device operation, and counts a number of positive transitions of the measurements, and counts a number of negative transitions of the measurements, the transitions relative to the stored initial baseline measurements. The device re-initializes the stored initial baseline measurements if and only if the count of negative transitions differs from the count of positive transitions by a predetermined amount (a “negative touch state”).

Abstract: Apparatuses and methods of multi-phase scanning are described.

Abstract: An active integrator for sensing capacitance of a touch sense array is disclosed. The active integrator is configured to receive from the touch sense array a response signal having a positive portion and a negative portion. The response signal is representative of a presence or an absence of a conductive object on the touch sense array. The active integrator is configured to continuously integrate the response signal.

Abstract: A method and apparatus for scanning a first set of electrodes of a capacitive sense array using a first sensing mode to identify a presence of an object in proximity to the capacitive sense array, where scanning using the first sensing mode identifies objects not in physical contact with the capacitive sense array. The first set of electrodes is scanned using a second sensing mode to determine a location of the object in relation to the capacitive sense array, where rescanning using the second sensing mode determines locations of objects in physical contact with the capacitive sense array.

Abstract: Apparatuses and methods to reduce the influence of a noise signal on touch screen controllers are described. One apparatus includes a detector to determine a presence of a noise signal from a display coupled to a capacitive touch screen. The apparatus also includes a synchronization circuit to synchronize signals produced by a touch screen controller with the noise signal to reduce the influence of the noise signal on capacitance measurements by the touch screen controller.

Abstract: A method can include determining multiple sensed positions of an object path in a touch sense region; generating at least a first predicted position from the sensed positions; and filtering a sense position, including associating the sense position with the object path if it is within a first proximity to at least the first predicted position, and not associating the sense position with the object path if it is outside of at least the first proximity from the first predicted position.

Abstract: An apparatus may include an internal charge pump within an integrated circuit package, an external pin positioned at an exterior of the integrated circuit package, and a select circuit configured to operate independently from the internal charge pump and located within the integrated circuit package, wherein the select circuit is configurable to selectively couple at least one of the internal charge pump and the external pin to a transmit (TX) sensor electrode.

Abstract: A method is disclosed for calculating position of a conductive object hovering above a plurality of mutual capacitance sensors. The method begins by measuring capacitance on a plurality of mutual capacitance sensors, each mutual capacitance sensor represented as a unit cell in an array of unit cells. After measuring the capacitances, the method identifies a peak unit cell based on the measured capacitances and calculates an edge cutoff value from the measured capacitances. After the edge cutoff value is calculated, a plurality of unit cells with measured capacitance within a range defined by the edge cutoff value is selected and the position of the hovering conductive object calculated. A user interface device is disclosed that comprises a first plurality capacitance sensing electrodes disposed along a first axis of an array, a second plurality of capacitance sensing electrodes disposed along a second axis of an array, and a controller.

Abstract: Apparatuses and methods of peak detection are described. One method measures touch data on a sense array, the touch data represented as multiple cells. The method performs multiple different peak-detection schemes on each of the cells to generate a list of one or more possible peaks in the touch data. The method selects one or more actual peaks from the list. The actual peaks are used to determine locations of touches proximate to the sense array.

Abstract: The capacitance sensing array comprising a plurality of nodes corresponding to intersections of a first plurality of electrodes with a second plurality of electrodes may be scanned. Capacitance values associated with one or more of the nodes may be measured. The capacitance values may be representative of a touch object proximate to the one or more of the nodes. A peak capacitance value of the capacitance values of one or more of the nodes may be identified. A set of capacitance values comprising cells based on the peak capacitance value may be generated. A portion of the cells of the set are associated with the nodes corresponding to the intersections of the first plurality of electrodes with the second plurality of electrodes and at least one of the cells of the set is associated with a virtual node that does not correspond to the intersections.

Abstract: Apparatuses and methods of frequency selection algorithms and frequency set selection are described. One method monitors a signal on the electrodes of a sense network, determine a first group of noise metrics of noise in the signal, determine a second group of noise metrics. The method switches from a first operating frequency in a first set to a second operating frequency in the first frequency set based on the first group of noise metrics and switches from the first operating frequency in the first set to a third operating frequency in a second frequency set based on the second group of noise metrics.

Abstract: A system and method are disclosed for performing on die jitter tolerance testing. A set of clocks are generated based on an input signal. The set of clocks include in an in-phase signal based on the data switching edge of the input signal. Additionally, the set of clocks include an inverted clock phase shifted by 180 degrees, and a pair of clocks phase shifted positively and negatively by a certain number of degrees, ?. Data input is sampled based on the inverted clock and the two phase shifted clocks. The eye opening of the input signal can be determined based on whether each of the inverted clock and the two phase shifted clocks sample the correct data from the input signal at various ? values.

Abstract: A self-shielding capacitive sensor array may include a first plurality of sensor elements and a second plurality of sensor elements, where each of the second plurality of sensor elements intersects each of the first plurality of sensor elements, such that each of the first plurality of sensor elements may be capacitively coupled with each of the second plurality of sensor elements. The first plurality of sensor elements may be configured to shield each of the second plurality of sensor elements from a noise source.

Abstract: A system and method are disclosed is to prevent the screen tearing in a video display system with self-refresh features while limiting space used for memory size in the self-refreshing sink device. A flexible method is utilized to manage a frame buffer and control self-refresh display timing to prevent screen tearing. The sink device has capabilities including one or more of self-refreshing and applying single frame updates as well as burst single frame updates while self-refresh is active. The memory utilized by the frame buffer during self-refresh is limited to less than that needed to store two full frames of video.

Abstract: An apparatus includes a reconfigurable charge pump including charge pump cells configurable into multiple different arrangements. The apparatus includes a control device configured to select a first arrangement of the charge pump cells from the multiple different arrangements based, at least in part, on an input voltage received by the reconfigurable charge pump and requested parameters of a drive signal for a touch screen panel. The reconfigurable charge pump can boost the input voltage based, at least in part, on the first arrangement of the charge pump cells. The control device can generate the drive signal according to the requested parameters based on the boosted input voltage.

Abstract: A circuit, method, and system is disclosed for measuring capacitance of a plurality of electrodes, detecting a presence of a conductive object proximate to at least one of the plurality of electrodes near an edge of a touchscreen display based on the measured capacitance, assigning a value to at least one virtual sensor derived from the measured capacitance of the at least one of the plurality of electrodes near the edge of the touchscreen display and activating at least one control element associated with a location outside the display area based on the value of the at least one virtual sensor.

Abstract: An embodiment of a method for detecting noise for a capacitance sensing panel may comprise generating an input signal based on a noise signal, performing a series of measurements for measuring capacitances from a capacitive sensor sensitive to the noise signal, and controlling timing for at least one of the subconversions based on the input signal.

Abstract: A method for compensating for panel capacitance the associated current is proposed, wherein the mutual capacitances of a capacitance sensing array are selectively coupled to drive voltages and to a self capacitance under test.

Abstract: Techniques for simultaneous touch scanning and display updates are described herein. In an example embodiment, a device comprises a display and one or more integrated circuit (IC) controllers. A sensor array is integrated within the display. The display comprises a thin-film transistor (TFT) layer and a top polarizing layer, and the sensor array comprises transmit (TX) electrodes that are disposed between the TFT layer and the top polarizing layer. The one or more IC controllers are configured to simultaneously update a row of pixels in the display and to drive one or more of the TX electrodes to scan the sensor array while the row of pixels is being updated, where the one or more of the TX electrodes are not associated with the row of pixels that is being updated.

Abstract: Apparatuses and methods of equalizing mutual capacitances of sense arrays using inactive electrodes disposed between or within transmit (TX) electrodes and aligned in relation to the receive (RX) electrodes.