Capacitance detecting method, integrated circuit, touch sensor system, and electronic device

• Main Author: Miyamoto Masayuki
• Format: Patent
• Language: English
• Published: 07.02.2017
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

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 (=di1, di2, . . . , diN, where i=1, . . . , M)) which are orthogonal to one another and include ±1 and each of which has a length N, drive lines (DL1 through DLM) in parallel for each of (I) a first capacitance column (Ci1) between the drive lines and a first sense line (SL1) and (II) a second capacitance column (Ci2) between the drive lines and a second sense line (SL2) so that voltages ±V are applied and (b) outputs outputs (sFirst=(s11, s12, . . . , s1N)) from the first capacitance column (Ci1) and outputs (sSecond=(s21, s22, . . . , s2N)) from the second capacitance column (Ci2), and (B) estimates (a) on the basis of a first inner product operation of the outputs (sFirst) and the code sequences (di), a first capacitance value in the first capacitance column (Ci1) and (b) on the basis of a second inner product operation of the outputs (sSecond) and the code sequences (di), a second capacitance value in the second capacitance column (Ci2).