Abstract: An apparatus includes a transmission system configured to transmit a drive signal to a touch screen device. The apparatus also includes a reception system configured to integrate an output signal received from a touch screen device in response to the drive signals and to filter the integrated output signal to suppress noise in the output signal, wherein the reception system is configured to integrate the output signal for a period of time that is less than or equal to a signal period corresponding to the drive signal.

Abstract: A touch sensing system and methods of operating the same for pipelined conversions are provided. In one embodiment, the method includes: (i) configuring a capacitive sensing system including a plurality of capacitive sensing elements for a first conversion; (ii) sensing capacitance in the capacitive sensing elements, and converting the capacitance sensed in the capacitive sensing elements to a digital, first conversion result; and (iii) while converting the capacitance sensed to the first conversion result, configuring the capacitive sensing system. In another embodiment, the capacitive sensing system includes a plurality of channels, and sensing capacitance and converting the capacitance sensed to the first conversion result includes integrating analog signals from the capacitive sensing elements for one of the plurality of channels while converting the integrated signal for another of the plurality of channels to a digital subconversion result.

Abstract: A method and apparatus scan a device at a first scanning rate and a second scanning rate, detect a first portion of a gesture through scanning at the first scanning rate, and detect a second portion of the gesture through scanning at the second scanning rate. The method and apparatus recognize the gesture based on the detected first portion of the gesture and the detected second portion of the gesture.

Abstract: A processing device performs a first scan of a first plurality of electrodes along a first axis in a capacitive sense array to generate a first plurality of capacitance values corresponding to a mutual capacitance at electrode intersections of the capacitive sense array. The processing device performs a second scan of a second plurality of electrodes along a second axis in the capacitive sense array to generate a second plurality of capacitance values corresponding to the mutual capacitance at the electrode intersections of the capacitive sense array. The processing device determines a first coordinate of a conductive object proximate to the capacitive sense array based on the a first subset of first plurality of signals and a second coordinate of the conductive object based on a second subset of the second plurality of signals.

Abstract: Techniques for designs of single-layer touch sensors are described herein. In an example embodiment, a device comprises a sensor array. The sensor array comprises first plurality of electrodes and second plurality of electrodes that are interleaved without intersecting each other within a touch-sensing area in a single layer on a substrate of the sensor array. A first electrode (of the first or second plurality) comprises at least two shaped portions. The two shaped portions may be disposed across at least a portion of a given second electrode from each other, or may be disposed between two or more portions of the given second electrode. The two shaped portions of the first electrode are routed in different directions on the substrate and are coupled to each other outside of the touch-sensing area of the sensor array.

Abstract: A sensor array that has first electrodes, second electrodes and third electrodes formed from a single layer of conductive material and interleaved without intersecting one another, in which each first electrode is coupled with at least one of the second electrodes via a mutual capacitance. Some of the third electrodes are disposed between the first electrodes and the second electrodes. All electrodes are interleaved without intersecting one another.

Abstract: An embodiment of a capacitive touch screen may comprise a display device comprising a substantially transparent substrate, a first plurality of electrodes attached to the substantially transparent substrate, wherein the first plurality of electrodes are substantially parallel in a first direction, and a second plurality of electrodes, wherein each of the second plurality of electrodes is capacitively coupled with each of the first plurality of electrodes.

Abstract: A method, apparatus, and system are described to perform, by a capacitance-sensing circuit, capacitance sensing of an electrode of a capacitive sense array of electrodes. Performing the capacitance sensing includes integrating, on a passive integrator circuit, charge from a sensed capacitance of the electrode of the capacitive sense array. The passive integrator circuit integrates the charge on a self-capacitance of the electrode as part of the integrating. The capacitance-sensing circuit converts the charge from the sensed capacitance of the electrode into a digital value representing the sensed capacitance of the electrode.

Abstract: Apparatus and methods of de-convolution for multi-phase scans of an array of electrodes are described. One programmable circuit includes a sequencer to initiate a multi-phase transmit (TX) scan of an array of electrodes to obtain capacitance data. The capacitance data is stored in one or more storage devices as convoluted capacitance data. The programmable circuit also includes a digital circuit block to read the convoluted capacitance data from the one or more storage devices, de-convolve the convoluted capacitance data to obtain de-convoluted capacitance data, and store the de-convoluted capacitance data in the one or more storage devices.

Abstract: Capacitive touch sensors and touchscreen data processing methods are provided. In one embodiment, the method includes sequentially integrating and converting charge from each of a plurality of sensing capacitors in an array to digital data, the digital data including sample values corresponding to a measured capacitance for each of the plurality of sensing capacitors. Noise is then separated from useful information by filtering the sample values on a sample-by-sample basis. Finally, the filtered sample values are summed and a position of at least one contact on the array determined using the filtered capacitance values. Other embodiments are also provided.

Abstract: An embodiment of a multiplexer circuit may include a plurality of PTOTAL receive (RX) channel outputs and a plurality of QTOTAL pins, where QTOTAL is greater than PTOTAL. Each of a first subset and a third subset of the plurality of QTOTAL pins may be switchably coupled to at least one of the plurality of RX channels, each of a second subset of the plurality of QTOTAL pins is switchably coupled to two of the plurality of RX channels, and for each possible subset of PTOTAL contiguous pins from the plurality of QTOTAL pins, each pin in the possible subset may be switchably coupled to a different RX channel output of the plurality of RX channel outputs.

Abstract: A method and apparatus determine a plurality of attribute values of a first detected presence, determine another plurality of attribute values of a second detected presence, and associate the first detected presence with the second detected presence based on the plurality of attribute values and the other plurality of attribute values.

Abstract: A system and method are disclosed to utilize Gray code in order to reduce the power consumption of column drivers in a display system. Binary source data is received from a timing controller. A Gray code digitizer converts and encodes the binary source data into a binary portion of data and a Gray code data. The binary portion data and the Gray code data are transmitted through a shift register to a digital-to-analog converter. The shift register consumes less power processing the converted binary portion of data and Gray code data than the corresponding binary source data. The digital-to-analog converter decodes the Gray code and generates corresponding gamma voltage levels for display use.

Abstract: A contact's interaction with a sensing array is subject to several external and internal stimuli which may impact a processing unit's confidence in the characteristics of that interaction or the presence of the interaction itself. Fidelity of user action is greatly improved with a step-wise and holistic analysis of a contact on an array of capacitance sensors, which allows for repetition of certain steps of processing or the entire operation if threshold confidence levels are not achieved.

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 system comprises a processing device and a capacitive sense array that includes a plurality of electrodes. The system performs a first scan of a plurality of electrodes in a capacitive sense array to determine a position of a stylus. The system also performs one or more additional scans of subsets of the plurality of electrodes to determine additional positions of the stylus. The system may continually perform the additional scans on of the subsets of the plurality of electrodes until the stylus is no longer detected.

Abstract: A first plurality of contact locations may be determined in view of a first scan of a touch-sensing surface and a second plurality of contact locations may be determined in view of a second scan of the touch-sensing surface. A number of total contact locations may be identified in view of the first plurality of contact locations and the second plurality of contact locations. Furthermore, a first correlation process may be performed when the number of total contact locations satisfies a threshold number and a second correlation process may be performed when the number of total contact locations does not satisfy the threshold number.

Abstract: Apparatuses and methods of calculating a touch orientation of a touch data measured on a sense array. One method calculates the touch orientation by determining a major axis length of the touch, determining a maximum width of the touch in a first axis, and calculating an inverse trigonometric function using the maximum width and the major axis length. Another method calculates the touch orientation by determining a centroid position of the touch and a touch outline of the touch, calculating perimeter distances between the centroid position and the touch outline, and calculating the orientation using the largest distance value of the calculated perimeter distances and the centroid position. Another method calculates the touch orientation by calculating eigenvalues and eigenvectors.

Abstract: An embodiment of a capacitive sensor array may comprise a first set of sensor electrodes each comprising one or more large subelements and a second set of sensor electrodes each comprising one or more small subelements. In one embodiment, each of the small subelements may be smaller than any of the large subelements, and the first set of sensor electrodes and the second set of sensor electrodes are formed from a single layer of conductive material. In one embodiment, the surface area of the capacitive sensor array may be divisible into a grid of N×M unit cells, wherein each of the N×M unit cells contains one of the large subelements and k of the small subelements, where k is greater than or equal to 2.

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”).