Linear system coefficient estimating method, linear device column value estimating method, capacitance detecting method, integrated circuit, touch sensor system, and electronic device

Abstract

A capacitance detecting method disclosed herein, which achieves a good detection accuracy, a good resolution, and a high-speed operation, (A)(a) drives, on the basis of code sequences (di (=di, . . . , diN, where i=1, . . . , M)) which are orthogonal to one another, drive lines (DL, . . . , DLM) in parallel for each of (I) a first capacitance column (Ci) between the drive lines and a first sense line (SL) and (II) a second capacitance column (Ci) between the drive lines and a second sense line (SL) and (b) outputs (sFirst=(s, . . . , sN)) from the column (Ci) and outputs (sSecond=(s, . . . , sN)) from the column (Ci), and (B) estimates (a) on the basis of inner product operation of the outputs (sFirst) and the code sequences (di), a first capacitance value in the column (Ci) and (b) on the basis of inner product operation of the outputs (sSecond) and the code sequences (di), a second capacitance value in the column (Ci).