Position detection circuit and position detection method in which line electrode of capacitive touch sensor is determined to be anomalous or possibly anomalous

Abstract

A position detection circuit is connected to a capacitive touch sensor that includes a plurality of line electrodes arranged in a two-dimensional lattice pattern. The position detection circuit includes: at least one processor device; and at least one memory device storing processor-executable instructions which, when executed by the processor device, cause the position detection circuit to: acquire capacitance-related detection values at crossing points of the line electrodes in association with positions of the crossing points; calculate a number of crossing points at which a detection value is smaller than a first threshold for each of the line electrodes; and determine that one or more of the line electrodes for which a calculated number of crossing points is greater than a second threshold are anomalous or possibly anomalous.