Sharp Kabushiki Kaisha Corporation

Hiroshi Kuhara

Masayuki Miyamoto

Mutsumi Hamaguchi

Tamiyo Nakabayashi

Realized is an electrostatic capacitance value distribution detecting device capable of determining whether or not external noise exists. An electrostatic capacitance value distribution detecting circuit () of an aspect of the present invention drives vertical signal lines (VL) to output, from horizontal signal lines (HL), electric charges corresponding to electrostatic capacitances, and then drives the horizontal signal lines to output, from the vertical signal lines, electric charges corresponding to the electrostatic capacitances. The electrostatic capacitance value distribution detecting device includes a noise detecting section () which determines whether or not external noise exists.

Touch panel system, and capacitance value distribution detecting device having noise determining section

A signal processing system () includes a switching circuits () which switches between subsystems (), on a basis of a frequency of noise mixed in each of time-series signals, the amount of that noise, and input-output transfer characteristics, to reduce noise present in a result of estimation of the value of a linear element (CX), which estimation is performed by addition- and subtraction-based signal processing.

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Osaka, Japan

Hiroshi Kuhara