An 87×49 mutual capacitance touch sensing IC enabling 0.5 mm-diameter stylus signal detection at 240 Hz-reporting-rate with palm rejection

@article{Yoshida2014An8M,
  title={An 87×49 mutual capacitance touch sensing IC enabling 0.5 mm-diameter stylus signal detection at 240 Hz-reporting-rate with palm rejection},
  author={Shin-ichi Yoshida and Mutsumi Hamaguchi and Takahiro Morishita and Shinji Shinjo and Akira Nagao and Masayuki Miyamoto},
  journal={2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)},
  year={2014},
  pages={217-220}
}
A touch sensing system capable of stylus input should have “palm rejection” function which allows the user to place one's palm on the surface of the touch sensor while writing with a stylus. In order to realize “palm rejection”, it is necessary to detect the small stylus while neglecting large signal from the palm. However this is not sufficient because small electrical noise injected through the palm into the touch sensor impedes stylus input signal in real use. This issue is because the… CONTINUE READING