Wacom Co., Ltd.

Renesas Electronics Corporation

Haruhiko Hisano

Sadao Yamamoto

Hideyuki Hara

Yoshifumi Konda

Jun Kadowaki

Masayuki Miyamoto

Tsukasa Nomi

Hideyuki Komatsu

Takeshi Koike

A data communication a system including: a stylus including a pen point electrode; a sensor controller; and a host processor. The stylus of data communication system is configured to transmit a pen signal with an electric field by capacitive coupling between the pen point electrode and a sensor electrode group; report, by the sensor controller, a position of the stylus in an operation surface to the host processor in response to detection of the pen signal by the sensor electrode group; supply, by the host processor, data to the sensor controller; and transmit, by the sensor controller, the data to the stylus in a stylus detection period in which the pen signal that is detected by the sensor electrode group indicates that the stylus is present within a predetermined distance from the operation surface.

Data communication method

A sensor system includes first sensor electrode groups and a first integrated circuit, and second sensor electrode groups and a second integrated circuit. The first integrated circuit and the second integrated circuit are controlled such that a first uplink signal, which is transmitted from the first integrated circuit via the first sensor electrode groups, and a second uplink signal, which is transmitted from the second integrated circuit via the second sensor electrode groups, are not transmitted at the same time.

Sensor system

To prevent drawing by pen input from stopping due to a failure in receiving an uplink signal, an active pen according to the present disclosure includes a processing circuit that transmits, at a second timing decided based on a first timing of a first uplink signal received from a sensor controller, a position signal and a data signal from a pen-tip electrode and receives a second uplink signal, and a wireless communication circuit that wirelessly communicates with the sensor controller. The processing circuit determines whether the second uplink signal has been received at the second timing, and in a case of determining that the second uplink signal has not been received, the processing circuit transmits at least part of the data signal via the wireless communication circuit while transmitting the position signal from the pen-tip electrode.

Active pen, position detection system, and integrated circuit

A position detection system includes a display device that displays image data by driving pixel electrodes, and a touch panel including a sensor electrode and a touch sensor. An active pen communicates with the touch sensor using a frequency included in a frequency band. The display device suppresses a frequency component in the frequency band in capacitive noise that occurs in the sensor electrode due to a voltage vibration in an interconnect in the display device caused by driving of the pixel electrodes. The display device selectively operates in either of a first operation mode in which driving of the pixel electrodes suppresses the frequency component included in the capacitive noise that occurs in the sensor electrode, and a second operation mode in which driving of the pixel electrodes does not suppress the frequency component included in the capacitive noise that occurs in the sensor electrode.

Position detection system and touch sensor

Provided is a communication method for communication performed between a pen and a sensor controller that, in operation, transmits uplink signals to the pen in a frame cycle. The communication method includes transmitting, by the sensor controller, a first uplink signal in a first frame, the first uplink signal including an identifier that identifies a type of data to be transmitted to the pen in a second frame following the first frame, and transmitting, by the sensor controller, a second uplink signal in the second frame, the second uplink signal including a value of the data of the type indicated by the identifier.

Communication method for communication between pen and sensor controller

A sensor controller, which is connected to sensor electrodes and detects positions of one or more active pens based on charge induced on the sensor electrodes, includes a processor and a memory. The memory stores instructions that, when executed by the processor, cause the sensor controller to: detect an approach of one of the one or more active pens using the sensor electrode; pair with the one of the one or more active pens with the approach of the one of the one or more active pens detected and update pairing state information indicative of a pairing state of each of the one or more active pens that is paired with the sensor controller; and transmit the pairing state information from the sensor electrodes to the one or more active pens via an uplink signal used as a reference for time synchronization.

Sensor controller, active pen, and communication method

A method is provided for transmitting transmission data from a sensor controller that detects a pen to the pen through a sensor electrode group. The pen includes a pen tip electrode arranged near a pen tip, and an analog circuit that detects edges of a signal led to the pen tip electrode. The pen also includes a digital circuit that performs a correlation operation of an output signal of the analog circuit and known patterns to detect the transmission data. The sensor controller is configured to generate a pulse signal representing the transmission data. The sensor controller is configured to transmit the pulse signal, by using a main signal and a sub signal of the pulse signal so as to enhance the edges, thereby transmitting the transmission data through the sensor electrode group.

Method of transmitting transmission data from sensor controller to pen, and pen

A method to be performed by a sensor controller that periodically transmits an uplink signal, and by a stylus that, upon receiving the uplink signal, determines a transmission and reception schedule for a downlink signal and the uplink signal on the basis of the reception timing of the uplink signal. The method includes executing, by the stylus, an uplink signal receiving operation for a first predetermined period of time according to the transmission and reception schedule. The method includes, responsive to the uplink signal not received through the receiving operation and expiration of the first predetermined period of time, continuing, by the stylus, the uplink signal receiving operation for a second predetermined period of time, instead of transmitting the downlink signal according to the transmission and reception schedule.

Method to be performed by stylus and sensor controller, stylus, and sensor controller

A pen is configured to supply an N-bit internal digital value NA to a sensor device, and includes an integrated circuit that acquires a series of the internal digital values NA(s) based on a state OPS of a writing pressure detector. The integrated circuit supplies a first internal digital value NA to the sensor device by transmitting, from an antenna, first transmission data MF including a first standard digital value MS corresponding to the first internal digital value NA. The integrated circuit supplies a second internal digital value NA to the sensor device by transmitting, from the antenna, second transmission data MF that is smaller than N bits and includes an M-bit relative digital value (M<N) corresponding to a relative value between the first internal digital value NA obtained by restoration from the first standard digital value MS and the second internal digital value NA.

Pen, sensor device, and pen system

A change of a resource allocation scheme in a multi-pen supporting electronic apparatus can be made in a shorter period of time than in the prior art. A sensor controllerassigns communication resources to one or more pens, respectively, and detects a position of each of the one or more penson the basis of a downlink signal DS received from each of the one or more pensusing the assigned communication resources. When changing a resource allocation scheme, which indicates a structure of the communication resources or a method of using the communication resources, the sensor controllerbroadcasts information indicating a new resource allocation scheme to the one or more pens

Sensor controller and pen

A pen is configured to supply an N-bit internal digital value NA to a sensor device, and includes an integrated circuit that acquires a series of the internal digital values NA(s) based on a state OPS of a writing pressure detector. The integrated circuit supplies a first internal digital value NA to the sensor device by transmitting, from an antenna, first transmission data MF including a first standard digital value MS corresponding to the first internal digital value NA. The integrated circuit supplies a second internal digital value NA to the sensor device by transmitting, from the antenna, second transmission data MF that is smaller than N bits and includes an M-bit relative digital value (M&#x3c;N) corresponding to a relative value between the first internal digital value NA obtained by restoration from the first standard digital value MS and the second internal digital value NA.

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Kanagawa, Japan

Haruhiko Hisano