公开(公告)号：US20180107309A1

公开(公告)日：2018-04-19

申请号：US15297540

申请日：2016-10-19

Applicant: SYNAPTICS INCORPORATED

Inventor： Kazuya ENDO ,  Shinobu NOHTOMI ,  Nobukazu TANAKA ,  Tomohiro HIRAKAWA ,  Hiroshi TAKEYAMA ,  Takayuki NOTO ,  Petr SHEPELEV

IPC: G06F3/041 ,  H03K17/96 ,  G09G3/36

CPC classification number: G06F3/0412 ,  G06F3/0416 ,  G09G3/3614 ,  G09G3/3655 ,  G09G2310/0289 ,  G09G2310/08 ,  G09G2330/02

Abstract: The semiconductor device is intended for connection with an in-cell type display touch panel having a plurality of common electrodes, a reference voltage for display is applied to the common electrodes in a display drive period, and the common electrodes serve as sensor electrodes in a touch detection period. The semiconductor device includes a DC level shift circuit operable to shift the DC level of a toggle signal output by a toggle drive circuit to the reference voltage. The semiconductor device supplies the reference voltage to the common electrodes of the display touch panel in the display drive period, and performs a guarding action in which at least a part of the plurality of common electrodes is supplied with a toggle signal shifted in DC level in the touch detection period.