The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2014
Filed:
Jan. 23, 2012
Mutsumi Hamaguchi, Osaka, JP;
Masayuki Miyamoto, Osaka, JP;
Kunihiko Iizuka, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A touch panel controller (), which can accurately detect changes in capacitance values of respective first and second electrostatic capacitors which are touched, includes: a driving section () for driving drive lines (DLthrough DL) on the basis of a code sequence so as to drive (i) electrostatic capacitors (Cthrough C) provided between the respective drive lines (DLthrough DL) and a sense line (SL) and (ii) electrostatic capacitors (Cthrough C) provided between the respective drive lines (DLthrough DL) and a sense line (SL) so that (i) a first linear sum of first capacitance values of the respective electrostatic capacitors (Cthrough C) is outputted from the sense line (SL) and (ii) a second linear sum of second capacitance values of the respective electrostatic capacitors (Cthrough C) is outputted from the sense line (SL); a differential amplifier () for amplifying a difference between the first linear sum and the second linear sum; and a saturation prevention control section () for correcting a line dependency between the first capacitance values and the second capacitance values.