Abstract: A touch sensitive device includes a plurality of sense electrodes arranged in a pattern to receive charge from drive electrodes. The pattern of sense electrodes has extreme portions having worst case charge transfer times, wherein the worst case charge transfer time at multiple extreme portions is substantially equal.

Abstract: In one embodiment, an apparatus includes a display component, a touch sensor component, and a touch-screen controller. The display component includes pixel-drive electrodes configured to display an image and the touch sensor component is configured to detect a touch input. The touch-screen controller, which is coupled to the touch sensor component, the display component, and the pixel-drive electrodes, is configured to generate a drive signal for the touch sensor component using the pixel-drive electrodes. The touch-screen controller is further configured to generate a pixel-chive signal for the display component using the pixel-drive electrodes.

Abstract: In one embodiment, a stylus includes electrodes operable to transmit signals wirelessly to a device through a touch sensor of the device. The stylus also includes one or more computer-readable non-transitory storage media within the stylus and embodying logic that is operable when executed to access first data representing a gesture made with the stylus by a user, such as a sequence of manipulations of the stylus. The logic is further operable to access second data representing a pre-defined authentication sequence and compare the first data with the second data. This comparison may authenticate the user to the stylus or the device, authenticate the stylus to the device or the user, or authenticate the device to the stylus or the user.

Abstract: In one embodiment, a stylus operable to communicate wirelessly with a device through a touch sensor of the device contains one or more computer-readable non-transitory storage media embodying logic that is operable when executed to access first data representing a recently occurred authentication event involving the stylus or the device. The logic is further operable to access second data representing a pre-defined authentication event. The logic is further operable to compare the first data with the second data to authenticate a user to the stylus or the device, a stylus to the user or the device, or a device to the user or the stylus.

Abstract: A touch sensitive device includes a plurality of sense electrodes arranged in a pattern to receive charge from drive electrodes. The pattern of sense electrodes has extreme portions having worst case charge transfer times, wherein the worst case charge transfer time at multiple extreme portions is substantially equal.

Abstract: In one embodiment, a touch position-sensing panel includes a sensing area. The sensing area includes a substrate and a plurality of first electrodes in a first layer. A first electrode of the plurality of first electrodes includes a first center region and a second electrode of the plurality of first electrodes comprises a second center region. The second electrode of the plurality of first electrodes does not include material of the first electrode of the plurality of first electrodes. A width of the second center region is less than a width of the first center region. The sensing area also includes a plurality of second electrodes in a second layer. The sensing area further includes a plurality of capacitive nodes formed by a capacitive coupling of the plurality of first electrodes in the first layer and the plurality of second electrodes in the second layer.

Abstract: In one embodiment, a stylus has one or more electrodes and one or more computer-readable non-transitory storage media embodying logic for transmitting signals wirelessly to a device through a touch-sensor of the device. The stylus also has an electronic circuit operable to provide an input that changes a property of one or more materials located on the body of the stylus or on the stylus tip.

Abstract: In one embodiment, a touch sensor includes a touch-sensitive area, a first set of electrodes, a first set of connection pads, and a first set of tracks. The first set of tracks electrically couple the first set of connection pads of the touch sensor to the first set of electrodes of the touch sensor. A first portion and a second portion of the first set of tracks extend along an edge of the touch-sensitive area of the touch sensor. The first portion of the first set of tracks are closer in distance to the first set of connection pads than the second portion of the first set of tracks. A first pitch between two tracks of the first portion of the first set of tracks is less than a second pitch between the two tracks of the second portion of the first set of tracks.

Abstract: In one embodiment, a stylus has one or more sensors that detect the movement of the stylus, such as an accelerometer, a gyroscope, or a magnetometer. The stylus wirelessly transmits signals to a device based on the movement of the stylus.

Abstract: In one embodiment, an apparatus includes one or more display layers within a display stack, the one or more display layers include a plurality of crystals configured to adjust a polarization of light passing through the one or more display layers. The apparatus includes a reference voltage layer that provides the one or more display layers with a reference voltage. The apparatus includes a plurality of pixel-drive electrodes that adjust the polarization of the light passing through the one or more display layers by adjusting an electrical potential between the plurality of pixel-drive electrodes and the reference voltage layer. The pixel-drive electrodes provide drive signals for a touch sensor and the reference voltage layer provides sense signals.

Abstract: A device includes a plurality of drive electrodes and a plurality of sense electrodes. The drive electrodes run generally in a first direction and have multiple projections along their length. The sense electrodes run generally in a second direction transverse to the drive electrodes. The sense electrodes have multiple projections interleaved with the multiple projections of the drive electrodes.

Abstract: In one embodiment, an apparatus includes a substrate including material having a low birefringence. One or more electrodes of a touch sensor are disposed on the substrate.

Abstract: In one embodiment, a touch position-sensing panel comprising a sensing area comprising a substrate, a plurality of first electrodes in a first layer, the plurality of first electrodes comprising conductive mesh and arranged in a first direction, the first layer having a first plurality of gaps formed therein, a plurality of second electrodes in a second layer, the plurality of second electrodes comprising conductive mesh and arranged in a second direction generally perpendicular to the first direction, the second layer having a second plurality of gaps formed therein, and a plurality of capacitive nodes formed by the capacitive coupling of the plurality of first electrodes in the first layer and the plurality of second electrodes in a second layer, the plurality of capacity nodes comprising at least one center node, at least one edge node, and at least one corner node, the at least one center node, at least one edge node, and at least one corner node comprising approximately equal areas.

Abstract: In one embodiment, a touch sensor includes a first set of tracks configured to electrically couple a first set of connection pads of the touch sensor to a first set of electrodes of the touch sensor. At least a portion of the first set of tracks extends in a direction, and at least one of the tracks in the first set of tracks has two or more different pitches at two or more different points along the extent of the first set of tracks. The touch sensor also includes a second set of tracks configured to electrically couple a second set of connection pads of the touch sensor to a second set of electrodes of the touch sensor. At least a portion of the second set of tracks extends in the direction and adjacent to the extent of the first set of tracks.

Abstract: In one embodiment, an apparatus comprises a substrate. The apparatus further comprises a plurality of drive electrodes disposed on the substrate. Each of the plurality of drive electrodes is formed of an opaque conductive material. The apparatus further comprises a plurality of resistors. For each adjacent pair of drive electrodes of the plurality of drive electrodes, a resistor of the plurality of resistors is coupled between the pair of drive electrodes.

Abstract: A device includes a plurality of adjacent electrodes for a touch sensitive device. The electrodes run generally in a first direction. Adjacent electrodes are interdigitated to provide one or more interpolation sections of the electrodes. Touch sensitive devices may utilize such interdigitated electrodes as drive electrodes, along with transverse sense electrodes formed over a display.

Abstract: An exemplary touch position-sensing panel has first and second electrodes that cross over each other to form touch sensing nodes at their intersections. Cut-outs are formed in the first electrodes at touch sensing nodes. The cut-outs extend at least partially across the region where second electrodes cross over the first electrode.

Abstract: In one embodiment, an apparatus includes a display stack for a touch-sensitive screen. The display stack comprises a plurality of layers in which a top layer comprises a substantially transparent cover layer. The display stack is configured to display a color image. The apparatus also includes a touch sensor provided within the display stack. The touch sensor comprises a plurality of first conductive electrodes contacting a layer of a subset of the plurality of layers of the display stack. The subset of the plurality of layers is below the substantially transparent cover layer. The touch sensor also includes a plurality of second conductive electrodes contacting a layer of the subset of the plurality of layers.

Abstract: A sensor is arranged to determine the presence of an object from a change in a capacitance of a sensing element. The sensor includes a capacitance measurement circuit operable to perform measurement cycles to measure a capacitance of the sensing element, and a controller circuit.

Abstract: A method of sensing the presence of a body from a change in an amount of charge present on a capacitively charged key. The method comprises inducing charge onto the key during a drive part of a measurement cycle, coupling a signal measurement capacitor to the key during a signal measurement part of the measurement cycle to the effect that the charge induced on the key during the drive part of the measurement cycle is transferred to the signal measurement capacitor, determining from a noise measurement part of the measurement cycle an amount of charge induced on the key by noise during the signal measurement part of the measurement cycle, and controlling the drive part, the signal measurement part and the noise measurement parts of the cycle to provide the charge sensing circuit with a measurement of the signal from which the noise induced on the key has been or can be substantially cancelled.