A sensor controller includes a transmitter configured to transmit an uplink signal including a first partial signal and a second partial signal. The transmitter is configured to transmit the first partial signal by direct spreading using a first spread code and transmit the second partial signal by direct spreading using a second spread code which is different from the first spread code and which has an identical chip time length to the first spread code. An active stylus includes a receiver configured to receive an uplink signal including a first partial signal and a second partial signal. The receiver is configured to synchronize with the uplink signal by detecting the first partial signal using a first spread code and thereafter detect the second partial signal using a second spread code, which is different from the first spread code and has an identical chip time length to the first spread code.

An active pen is provided, which facilitates avoiding complex computation for phase acquisition on the side of a sensor integrated circuit configured to receive downlink signals from active pens, and allows for generating carrier waves for the downlink signals using a simple configuration, namely, a frequency dividing circuit, while reducing a difference in unused time in one time slot between the active pens. An active pen 2 is configured to transmit one or more symbol values in one time slot, and includes a frequency dividing circuit 43 configured to frequency-divide a reference clock with a frequency division ratio based on each of a plurality of frequencies different from each other, to thereby generate a plurality of carrier waves having frequencies different from each other. The active pen 2 includes a modulation (transmission) circuit 44 configured to transmit a first downlink signal in a symbol duration that is common among the plurality of frequencies, the first downlink signal obtained by modulating a first carrier wave, which is among the plurality of carrier waves generated by the frequency dividing circuit 43, with a value of a first symbol that is a transmission target.

A system and method for capacitive sensing comprises driving a first sensor electrode of a plurality of sensor electrodes with a first sensing signal to acquire a first resulting signal with the first sensor electrode during a period and driving a second sensor electrode of the plurality of sensor electrodes with the first sensing signal to acquire a second resulting signal with the second sensor electrode during the period. Further, a third sensor electrode of the plurality of sensor electrodes is driven with a reference signal during the period. Rotational information for an input object is determined at least partially based on the first resulting signal and the second resulting signal.

An electronic apparatus includes an electrode substrate that has a transparent first electrode and a transparent second electrode that are provided on one surface of a transparent insulating substrate, and an insulating film that electrically insulates the first electrode from the second electrode, the electrode substrate being configured so as to cover a surface of a display medium where an image is displayed; and a driver circuit that is connected to the electrode substrate and generates an electric field between the first electrode and the second electrode by applying a voltage to the first electrode and the second electrode.

In one embodiment, a stylus includes one or more electrodes included in a tip, and a computer-readable non-transitory storage medium embodying logic that is configured when executed to receive, by the one or more electrodes and an analog front end, signals transmitted from a touch sensor coupled to a touch-sensor controller, and convert the signals into sequences of digital signals. The logic is further configured when executed to feed the sequences of digital signals received in different periods into a memory; correlate each of the sequences of digital signals with a digital data defined by a wide-band code to generate multiple correlations; and transmit a transmission signal to the touch-sensor controller according to a synchronization timing determined based at least in part on one or more of the multiple correlations.

An apparatus and method for compensating the effect of a contact by a hand or other body part of a user with a touch screen while holding an input device on the strength of a capacitively coupled uplink signal provided to the input device by a host device, by detecting and/or discriminating the body touch and modifying at least one uplink channel parameter.

An electronic device according to an embodiment includes: a display panel; a touch electrode layer disposed on the display panel and comprising at least one touch electrode; and a conductive wire disposed on the display panel, disposed on the same layer as the touch electrode layer, and generating a magnetic field signal for driving a stylus pen.

A method for a touch-sensitive display device comprises detecting a position of a stylus touch input relative to a plurality of touch-sensing electrodes, the stylus touch input corresponding to proximity of an active stylus to a display surface. A position of a human hand touch input is detected, corresponding to proximity of a human hand to the display surface. Each of the plurality of touch-sensing electrodes are driven with a first drive signal to communicate data to the active stylus. An electrical grounding condition is detected that interferes with reception of the first drive signal by the active stylus. A hand-proximity-subset of the plurality of touch-sensing electrodes within a threshold distance of the position of the human hand touch input are driven with a second drive signal, different from the first drive signal.

An input device includes a housing, a power supply disposed within the housing, a controller disposed within the housing and that receives power from the power supply, a resonance circuit disposed within the housing and that generates a first type signal based on a signal received from the controller, and a conductor disposed within the housing and that transfers a second type signal received from the controller, and the first type signal and the second type signal have different waveforms from each other.

A position detection device includes sensor electrodes including a first sensor electrode and a second sensor electrode that are adjacent to each other, connection wires connected to the respective sensor electrodes and including first and second connection wires connected to the first and second sensor electrodes, respectively, a sensor controller connected to the connection wires, and a first extension line; and a second extension line. Some of the plurality of connection wires, including the first connection wire, extend at regular intervals in a first region. The connection wires, including the second connection wire, are arranged to extend at regular intervals in a second region different from the first region. The first extension line extends along the second connection wire in the second region and is electrically connected to the first sensor electrode. The second extension line extends along the first connection wire in the first region and is electrically connected to the second sensor electrode.