公开(公告)号：US20190243483A1

公开(公告)日：2019-08-08

申请号：US16254689

申请日：2019-01-23

Applicant: Futaba Corporation

Inventor： Terukazu SUGIMOTO ,  Takashi MUGURUMA ,  Hiroyuki TANAKA ,  Katsumi TAKAYAMA ,  Cheng-Che HO ,  Fumikazu OMOTO

IPC: G06F3/044

Abstract: A touch panel driving device, for sequentially performing scanning for selecting a pair of adjacent transmission signal lines and a pair of adjacent reception signal lines on a touch panel, includes a reception circuit configured to receive reception signals whose waveforms are changed by a capacitance change caused by an operation from the pair of reception signal lines of the touch panel and generate a detection value for monitoring a touch panel operation. The reception circuit generates the detection value by comparing levels of the reception signals from the reception signal lines while sequentially switching capacitance values of a measurement capacitance unit connected to one of the reception signal lines. The measurement capacitance unit includes capacitance units each forming a certain capacitance value by parallel connection or series connection of capacitors as a capacitance unit forming one capacitance value used for switching the capacitance value of the measurement capacitance unit.

公开(公告)号：US20200004400A1

公开(公告)日：2020-01-02

申请号：US16449654

申请日：2019-06-24

Applicant: FUTABA CORPORATION

Inventor： Takashi MUGURUMA ,  Terukazu SUGIMOTO ,  Katsumi TAKAYAMA ,  Hiroyuki TANAKA

IPC: G06F3/041 ,  G06F3/044

Abstract: A touch panel driving device is provided for sequentially performing a scanning of selecting a pair of transmission signal lines from N number of transmission signal lines and a pair of reception signal lines from M number of reception signal lines. The touch panel driving device includes a reception circuit for respectively receiving, from the pair of reception signal lines, reception signals whose waveforms are changed due to a capacitance change caused by a touch operation and for generating a detection value for detecting the touch operation by comparing the received reception signals, and a plurality of noise filters provided in signal paths from the M number of reception signal lines to the reception circuit for performing a filtering operation of the same filtering characteristics on each of the reception signals supplied to the reception circuit from the pair of reception signal lines.