Sharp Kabushiki Kaisha Corporation

Tamiyo Nakabayashi

Shinichi Yoshida

Masayuki Miyamoto

Mutsumi Hamaguchi

Shunsuke Nagasawa

Hiroshi Kuhara

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 touch panel system can accurately detect a position of an indicator as distinguished from noise, an electronic information device, and an indicator position detecting method are provided. An indicator position detecting portion detects a position of an indicator, which is in contact with or close to a detecting surface P, based on either one of a first or a second capacitance signal. The first capacitance signal is obtained in a first driving mode in which a first drive signal is applied to first signal lines and a first sense signal appearing on second signal lines is applied to a sense signal processing portion. The second capacitance signal is obtained in a second driving mode in which a second drive signal is applied to the second signal lines, and a second sense signal appearing on the first signal lines is applied to the sense signal processing portion.

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Osaka, Japan

Tamiyo Nakabayashi