公开(公告)号：US10372248B2

公开(公告)日：2019-08-06

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: G09G3/36 ,  G06F3/041

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.