Wacom Co., Ltd.

Hiroshi Mizuhashi

Joo Hoon Lee

Yoshihisa Sugiyama

Akira Ito

Tatsunori Kato

Takaya Oyama

Yoshihiro Kotani

Fumitaka Goto

Hiroyuki Sakuma

Provided is a position detector including a coil configured to function as a sensor and including a transfer coil that transfers an alternating magnetic field based on a transfer signal to a position indicator, and a signal processing circuit connected to the coil and configured to detect a pen signal generated by the position indicator, generate the transfer signal with a frequency based on frequency information of the detected pen signal, and transfer the transfer signal to the transfer coil.

Position detector, integrated circuit, and position detection method

To improve the S/N ratio of a pen signal received in a sensor controller, without decreasing the frequency of position detection or increasing the circuit scale of the sensor controller, a method according to the present invention is executed by a sensor controller of an electromagnetic resonance system, and in each of a plurality of pen signal detection periods Tto T, three loop coils LCxto LCxare connected in connection modes having different connection polarities for each pen signal detection period, a result value indicating a level of a pen signal is detected via the three loop coils LCxto LCx, and the level of the pen signal corresponding to each of the three loop coils LCxto LCxis separately acquired by performing a restoration operation according to the connection polarities on a plurality of the result values detected in the respective pen signal detection periods.

Method executed by sensor controller of electromagnetic resonance system, sensor controller, and position detection device

Provided is a computer including a host processor which, in operation, generates a stroke image representing a stroke indicated by a series of coordinate data indicating a plurality of positions of a pen on a touch surface and generates a video signal representing the stroke image, a timing controller which, in operation, controls, based on the video signal, a potential of each of a plurality of gate lines provided in a display, and a temporary stroke image generation processor which in operation, generates, in parallel with the host processor, a temporary stroke image representing a same stroke as the stroke of the stroke image, in which the temporary stroke image is superimposed on the video signal before the video signal is supplied to the timing controller.

Computer

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Saitama, Japan

Hiroshi Mizuhashi